diff --git a/Cargo.lock b/Cargo.lock
index b03e9ca..adc1cbb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -955,6 +955,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "getopts"
+version = "0.2.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cba6ae63eb948698e300f645f87c70f76630d505f23b8907cf1e193ee85048c1"
+dependencies = [
+ "unicode-width",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.1.16"
@@ -1743,15 +1752,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
 
-[[package]]
-name = "markdown"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5cab8f2cadc416a82d2e783a1946388b31654d391d1c7d92cc1f03e295b1deb"
-dependencies = [
- "unicode-id",
-]
-
 [[package]]
 name = "markup5ever"
 version = "0.35.0"
@@ -2355,6 +2355,25 @@ dependencies = [
  "syn 2.0.101",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e8bbe1a966bd2f362681a44f6edce3c2310ac21e4d5067a6e7ec396297a6ea0"
+dependencies = [
+ "bitflags 2.9.1",
+ "getopts",
+ "memchr",
+ "pulldown-cmark-escape",
+ "unicase",
+]
+
+[[package]]
+name = "pulldown-cmark-escape"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "007d8adb5ddab6f8e3f491ac63566a7d5002cc7ed73901f72057943fa71ae1ae"
+
 [[package]]
 name = "qoi"
 version = "0.4.1"
@@ -3301,7 +3320,7 @@ dependencies = [
 
 [[package]]
 name = "tetratto-core"
-version = "12.0.0"
+version = "12.0.2"
 dependencies = [
  "async-recursion",
  "base16ct",
@@ -3334,13 +3353,14 @@ dependencies = [
 
 [[package]]
 name = "tetratto-shared"
-version = "12.0.0"
+version = "12.0.6"
 dependencies = [
  "ammonia",
  "chrono",
  "hex_fmt",
- "markdown",
+ "pulldown-cmark",
  "rand 0.9.1",
+ "regex",
  "serde",
  "sha2",
  "snowflaked",
@@ -3871,12 +3891,6 @@ version = "0.3.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c1cb5db39152898a79168971543b1cb5020dff7fe43c8dc468b0885f5e29df5"
 
-[[package]]
-name = "unicode-id"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "10103c57044730945224467c09f71a4db0071c123a0648cc3e818913bde6b561"
-
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
@@ -3898,6 +3912,12 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e70f2a8b45122e719eb623c01822704c4e0907e7e426a05927e1a1cfff5b75d0"
 
+[[package]]
+name = "unicode-width"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a1a07cc7db3810833284e8d372ccdc6da29741639ecc70c9ec107df0fa6154c"
+
 [[package]]
 name = "untrusted"
 version = "0.9.0"
diff --git a/crates/app/src/assets.rs b/crates/app/src/assets.rs
index 1504ba5..82cf197 100644
--- a/crates/app/src/assets.rs
+++ b/crates/app/src/assets.rs
@@ -4,15 +4,11 @@ use nanoneo::{
 };
 use pathbufd::PathBufD;
 use regex::Regex;
-use std::{
-    collections::HashMap,
-    fs::{exists, read_to_string, write},
-    sync::LazyLock,
-    time::SystemTime,
-};
+use std::{collections::HashMap, fs::read_to_string, sync::LazyLock, time::SystemTime};
 use tera::Context;
 use tetratto_core::{
     config::Config,
+    html::{pull_icons, ICONS},
     model::{
         auth::{DefaultTimelineChoice, User},
         permissions::{FinePermission, SecondaryPermission},
@@ -157,38 +153,6 @@ pub const TETRATTO_BUNNY: &[u8] = include_bytes!("./public/images/tetratto_bunny
 pub(crate) static HTML_FOOTER: LazyLock<RwLock<String>> =
     LazyLock::new(|| RwLock::new(String::new()));
 
-/// A container for all loaded icons.
-pub(crate) static ICONS: LazyLock<RwLock<HashMap<String, String>>> =
-    LazyLock::new(|| RwLock::new(HashMap::new()));
-
-/// Pull an icon given its name and insert it into [`ICONS`].
-pub(crate) async fn pull_icon(icon: &str, icons_dir: &str) {
-    let writer = &mut ICONS.write().await;
-
-    let icon_url = format!(
-        "https://raw.githubusercontent.com/lucide-icons/lucide/refs/heads/main/icons/{icon}.svg"
-    );
-
-    let file_path = PathBufD::current().extend(&[icons_dir, &format!("{icon}.svg")]);
-
-    if exists(&file_path).unwrap() {
-        writer.insert(icon.to_string(), read_to_string(&file_path).unwrap());
-        return;
-    }
-
-    println!("download icon: {icon}");
-    let svg = reqwest::get(icon_url)
-        .await
-        .unwrap()
-        .text()
-        .await
-        .unwrap()
-        .replace("\n", "");
-
-    write(&file_path, &svg).unwrap();
-    writer.insert(icon.to_string(), svg);
-}
-
 macro_rules! vendor_icon {
     ($name:literal, $icon:ident, $icons_dir:expr) => {{
         let writer = &mut ICONS.write().await;
@@ -261,56 +225,8 @@ pub(crate) async fn replace_in_html(
         input = input.replace(cap.get(0).unwrap().as_str(), &replace_with);
     }
 
-    // icon (with class)
-    let icon_with_class =
-        Regex::new("(\\{\\{)\\s*(icon)\\s*(.*?)\\s*c\\((.*?)\\)\\s*(\\}\\})").unwrap();
-
-    for cap in icon_with_class.captures_iter(&input.clone()) {
-        let cap_str = &cap.get(3).unwrap().as_str().replace("\"", "");
-        let icon = &(if cap_str.contains(" }}") {
-            cap_str.split(" }}").next().unwrap().to_string()
-        } else {
-            cap_str.to_string()
-        });
-
-        pull_icon(icon, &config.dirs.icons).await;
-
-        let reader = ICONS.read().await;
-        let icon_text = reader.get(icon).unwrap().replace(
-            "<svg",
-            &format!("<svg class=\"icon {}\"", cap.get(4).unwrap().as_str()),
-        );
-
-        input = input.replace(
-            &format!(
-                "{{{{ icon \"{cap_str}\" c({}) }}}}",
-                cap.get(4).unwrap().as_str()
-            ),
-            &icon_text,
-        );
-    }
-
-    // icon (without class)
-    let icon_without_class = Regex::new("(\\{\\{)\\s*(icon)\\s*(.*?)\\s*(\\}\\})").unwrap();
-
-    for cap in icon_without_class.captures_iter(&input.clone()) {
-        let cap_str = &cap.get(3).unwrap().as_str().replace("\"", "");
-        let icon = &(if cap_str.contains(" }}") {
-            cap_str.split(" }}").next().unwrap().to_string()
-        } else {
-            cap_str.to_string()
-        });
-
-        pull_icon(icon, &config.dirs.icons).await;
-
-        let reader = ICONS.read().await;
-        let icon_text = reader
-            .get(icon)
-            .unwrap()
-            .replace("<svg", "<svg class=\"icon\"");
-
-        input = input.replace(&format!("{{{{ icon \"{cap_str}\" }}}}",), &icon_text);
-    }
+    // icons
+    input = pull_icons(input, &config.dirs.icons).await;
 
     // return
     input = input.replacen("<!-- html_footer_goes_here -->", &format!("{reader}"), 1);
diff --git a/crates/app/src/langs/en-US.toml b/crates/app/src/langs/en-US.toml
index 3246755..bd692f3 100644
--- a/crates/app/src/langs/en-US.toml
+++ b/crates/app/src/langs/en-US.toml
@@ -258,6 +258,7 @@ version = "1.0.0"
 "developer:label.change_homepage" = "Change homepage"
 "developer:label.change_redirect" = "Change redirect URL"
 "developer:label.change_quota_status" = "Change quota status"
+"developer:label.change_storage_capacity" = "Change storage capacity"
 "developer:label.manage_scopes" = "Manage scopes"
 "developer:label.scopes" = "Scopes"
 "developer:label.guides_and_help" = "Guides & help"
diff --git a/crates/app/src/main.rs b/crates/app/src/main.rs
index bfac36f..b0098b7 100644
--- a/crates/app/src/main.rs
+++ b/crates/app/src/main.rs
@@ -36,12 +36,13 @@ pub(crate) type InnerState = (DataManager, Tera, Client, Option<StripeClient>);
 pub(crate) type State = Arc<RwLock<InnerState>>;
 
 fn render_markdown(value: &Value, _: &HashMap<String, Value>) -> tera::Result<Value> {
-    Ok(
-        tetratto_shared::markdown::render_markdown(&CustomEmoji::replace(value.as_str().unwrap()))
-            .replace("\\@", "@")
-            .replace("%5C@", "@")
-            .into(),
+    Ok(tetratto_shared::markdown::render_markdown(
+        &CustomEmoji::replace(value.as_str().unwrap()),
+        true,
     )
+    .replace("\\@", "@")
+    .replace("%5C@", "@")
+    .into())
 }
 
 fn render_emojis(value: &Value, _: &HashMap<String, Value>) -> tera::Result<Value> {
diff --git a/crates/app/src/public/html/components.lisp b/crates/app/src/public/html/components.lisp
index d3c1a7f..8475223 100644
--- a/crates/app/src/public/html/components.lisp
+++ b/crates/app/src/public/html/components.lisp
@@ -2415,7 +2415,7 @@
 (ul
     ("style" "margin-bottom: var(--pad-4)")
     (li
-        (text "Increased app storage limit (500 KB->5 MB)"))
+        (text "Increased app storage limit (500 KB->25 MB)"))
     (li
         (text "Ability to create forges"))
     (li
diff --git a/crates/app/src/public/html/developer/app.lisp b/crates/app/src/public/html/developer/app.lisp
index b1661e8..d19fb10 100644
--- a/crates/app/src/public/html/developer/app.lisp
+++ b/crates/app/src/public/html/developer/app.lisp
@@ -44,6 +44,28 @@
                             ("value" "Unlimited")
                             ("selected" "{% if app.quota_status == 'Unlimited' -%}true{% else %}false{%- endif %}")
                             (text "Unlimited")))))
+            (div
+                ("class" "card-nest")
+                (div
+                    ("class" "card small flex items-center gap-2")
+                    (icon (text "database-zap"))
+                    (b (str (text "developer:label.change_storage_capacity"))))
+                (div
+                    ("class" "card")
+                    (select
+                        ("onchange" "save_storage_capacity(event)")
+                        (option
+                            ("value" "Tier1")
+                            ("selected" "{% if app.storage_capacity == 'Tier1' -%}true{% else %}false{%- endif %}")
+                            (text "Tier 1 (25 MB)"))
+                        (option
+                            ("value" "Tier2")
+                            ("selected" "{% if app.storage_capacity == 'Tier2' -%}true{% else %}false{%- endif %}")
+                            (text "Tier 2 (50 MB)"))
+                        (option
+                            ("value" "Tier3")
+                            ("selected" "{% if app.storage_capacity == 'Tier3' -%}true{% else %}false{%- endif %}")
+                            (text "Tier 3 (100 MB)")))))
             (text "{%- endif %}")
             (div
                 ("class" "card-nest")
@@ -232,6 +254,26 @@
                 });
         };
 
+        globalThis.save_storage_capacity = (event) => {
+            const selected = event.target.selectedOptions[0];
+            fetch(\"/api/v1/apps/{{ app.id }}/storage_capacity\", {
+                method: \"POST\",
+                headers: {
+                    \"Content-Type\": \"application/json\",
+                },
+                body: JSON.stringify({
+                    storage_capacity: selected.value,
+                }),
+            })
+                .then((res) => res.json())
+                .then((res) => {
+                    trigger(\"atto::toast\", [
+                        res.ok ? \"success\" : \"error\",
+                        res.message,
+                    ]);
+                });
+        };
+
         globalThis.change_title = async (e) => {
             e.preventDefault();
 
diff --git a/crates/app/src/public/html/mod/profile.lisp b/crates/app/src/public/html/mod/profile.lisp
index 2b68c90..5a84aac 100644
--- a/crates/app/src/public/html/mod/profile.lisp
+++ b/crates/app/src/public/html/mod/profile.lisp
@@ -406,6 +406,7 @@
                         MANAGE_SERVICES: 1 << 3,
                         MANAGE_PRODUCTS: 1 << 4,
                         DEVELOPER_PASS: 1 << 5,
+                        MANAGE_LETTERS: 1 << 6,
                     },
                     \"secondary_role\",
                     \"add_permission_to_secondary_role\",
diff --git a/crates/app/src/public/html/profile/base.lisp b/crates/app/src/public/html/profile/base.lisp
index 7e4d6fb..e10dec9 100644
--- a/crates/app/src/public/html/profile/base.lisp
+++ b/crates/app/src/public/html/profile/base.lisp
@@ -107,6 +107,7 @@
                         (p
                             (text "{{ profile.settings.status }}"))
                         (text "{%- endif %}")
+                        (text "{% if not profile.settings.hide_social_follows or (user and user.id == profile.id) -%}")
                         (div
                             ("class" "w-full flex")
                             (a
@@ -123,6 +124,7 @@
                                     (text "{{ profile.following_count }}"))
                                 (span
                                     (text "{{ text \"auth:label.following\" }}"))))
+                        (text "{%- endif %}")
                         (text "{% if is_following_you -%}")
                         (b
                             ("class" "notification chip w-content flex items-center gap-2")
diff --git a/crates/app/src/public/html/profile/settings.lisp b/crates/app/src/public/html/profile/settings.lisp
index 59b64d0..64d3a30 100644
--- a/crates/app/src/public/html/profile/settings.lisp
+++ b/crates/app/src/public/html/profile/settings.lisp
@@ -1889,6 +1889,14 @@
                         \"{{ profile.settings.hide_from_social_lists }}\",
                         \"checkbox\",
                     ],
+                    [
+                        [
+                            \"hide_social_follows\",
+                            \"Hide followers/following links on my profile\",
+                        ],
+                        \"{{ profile.settings.hide_social_follows }}\",
+                        \"checkbox\",
+                    ],
                     [[], \"Questions\", \"title\"],
                     [
                         [
diff --git a/crates/app/src/public/js/app_sdk.js b/crates/app/src/public/js/app_sdk.js
index cd21e6a..7a6c834 100644
--- a/crates/app/src/public/js/app_sdk.js
+++ b/crates/app/src/public/js/app_sdk.js
@@ -72,6 +72,25 @@ export default function tetratto({
         );
     }
 
+    async function check_ip(ip) {
+        if (!api_key) {
+            throw Error("No API key provided.");
+        }
+
+        return api_promise(
+            json_parse(
+                await (
+                    await fetch(`${host}/api/v1/bans/${ip}`, {
+                        method: "GET",
+                        headers: {
+                            "Atto-Secret-Key": api_key,
+                        },
+                    })
+                ).text(),
+            ),
+        );
+    }
+
     async function query(body) {
         if (!api_key) {
             throw Error("No API key provided.");
@@ -285,6 +304,7 @@ export default function tetratto({
         api_key,
         // app data
         app,
+        check_ip,
         query,
         insert,
         update,
diff --git a/crates/app/src/routes/api/v1/app_data.rs b/crates/app/src/routes/api/v1/app_data.rs
index d5e8c3f..b5fa212 100644
--- a/crates/app/src/routes/api/v1/app_data.rs
+++ b/crates/app/src/routes/api/v1/app_data.rs
@@ -72,7 +72,7 @@ pub async fn create_request(
 
     // check size
     let new_size = app.data_used + req.value.len();
-    if new_size > AppData::user_limit(&owner) {
+    if new_size > AppData::user_limit(&owner, &app) {
         return Json(Error::AppHitStorageLimit.into());
     }
 
@@ -155,12 +155,19 @@ pub async fn update_value_request(
     let size_without = app.data_used - app_data.value.len();
     let new_size = size_without + req.value.len();
 
-    if new_size > AppData::user_limit(&owner) {
+    if new_size > AppData::user_limit(&owner, &app) {
         return Json(Error::AppHitStorageLimit.into());
     }
 
     // ...
-    if let Err(e) = data.add_app_data_used(app.id, req.value.len() as i32).await {
+    // we only need to add the delta size (the next size - the old size)
+    if let Err(e) = data
+        .add_app_data_used(
+            app.id,
+            (req.value.len() as i32) - (app_data.value.len() as i32),
+        )
+        .await
+    {
         return Json(e.into());
     }
 
diff --git a/crates/app/src/routes/api/v1/apps.rs b/crates/app/src/routes/api/v1/apps.rs
index 3b5cd60..eac16ba 100644
--- a/crates/app/src/routes/api/v1/apps.rs
+++ b/crates/app/src/routes/api/v1/apps.rs
@@ -15,7 +15,7 @@ use tetratto_core::model::{
     ApiReturn, Error,
 };
 use tetratto_shared::{hash::random_id, unix_epoch_timestamp};
-use super::CreateApp;
+use super::{CreateApp, UpdateAppStorageCapacity};
 
 pub async fn create_request(
     jar: CookieJar,
@@ -138,6 +138,35 @@ pub async fn update_quota_status_request(
     }
 }
 
+pub async fn update_storage_capacity_request(
+    jar: CookieJar,
+    Extension(data): Extension<State>,
+    Path(id): Path<usize>,
+    Json(req): Json<UpdateAppStorageCapacity>,
+) -> impl IntoResponse {
+    let data = &(data.read().await).0;
+    let user = match get_user_from_token!(jar, data) {
+        Some(ua) => ua,
+        None => return Json(Error::NotAllowed.into()),
+    };
+
+    if !user.permissions.check(FinePermission::MANAGE_APPS) {
+        return Json(Error::NotAllowed.into());
+    }
+
+    match data
+        .update_app_storage_capacity(id, req.storage_capacity)
+        .await
+    {
+        Ok(_) => Json(ApiReturn {
+            ok: true,
+            message: "App updated".to_string(),
+            payload: (),
+        }),
+        Err(e) => Json(e.into()),
+    }
+}
+
 pub async fn update_scopes_request(
     jar: CookieJar,
     Extension(data): Extension<State>,
diff --git a/crates/app/src/routes/api/v1/auth/ipbans.rs b/crates/app/src/routes/api/v1/auth/ipbans.rs
index 7163091..a8eb856 100644
--- a/crates/app/src/routes/api/v1/auth/ipbans.rs
+++ b/crates/app/src/routes/api/v1/auth/ipbans.rs
@@ -1,12 +1,34 @@
 use crate::{
-    State, get_user_from_token,
+    get_app_from_key, get_user_from_token,
     model::{ApiReturn, Error},
     routes::api::v1::CreateIpBan,
+    State,
 };
-use axum::{Extension, Json, extract::Path, response::IntoResponse};
+use axum::{extract::Path, http::HeaderMap, response::IntoResponse, Extension, Json};
 use crate::cookie::CookieJar;
 use tetratto_core::model::{addr::RemoteAddr, auth::IpBan, permissions::FinePermission};
 
+/// Check if the given IP is banned.
+pub async fn check_request(
+    headers: HeaderMap,
+    Path(ip): Path<String>,
+    Extension(data): Extension<State>,
+) -> impl IntoResponse {
+    let data = &(data.read().await).0;
+    if get_app_from_key!(data, headers).is_none() {
+        return Json(Error::NotAllowed.into());
+    }
+
+    Json(ApiReturn {
+        ok: true,
+        message: "Success".to_string(),
+        payload: data
+            .get_ipban_by_addr(&RemoteAddr::from(ip.as_str()))
+            .await
+            .is_ok(),
+    })
+}
+
 /// Create a new IP ban.
 pub async fn create_request(
     jar: CookieJar,
diff --git a/crates/app/src/routes/api/v1/mod.rs b/crates/app/src/routes/api/v1/mod.rs
index 6b56e9b..8a5d95a 100644
--- a/crates/app/src/routes/api/v1/mod.rs
+++ b/crates/app/src/routes/api/v1/mod.rs
@@ -20,9 +20,9 @@ use axum::{
     routing::{any, delete, get, post, put},
     Router,
 };
-use serde::{Deserialize};
+use serde::Deserialize;
 use tetratto_core::model::{
-    apps::{AppDataSelectMode, AppDataSelectQuery, AppQuota},
+    apps::{AppDataSelectMode, AppDataSelectQuery, AppQuota, DeveloperPassStorageQuota},
     auth::AchievementName,
     communities::{
         CommunityContext, CommunityJoinAccess, CommunityReadAccess, CommunityWriteAccess,
@@ -432,6 +432,10 @@ pub fn routes() -> Router {
             "/apps/{id}/quota_status",
             post(apps::update_quota_status_request),
         )
+        .route(
+            "/apps/{id}/storage_capacity",
+            post(apps::update_storage_capacity_request),
+        )
         .route("/apps/{id}/scopes", post(apps::update_scopes_request))
         .route("/apps/{id}/grant", post(apps::grant_request))
         .route("/apps/{id}/roll", post(apps::roll_api_key_request))
@@ -491,6 +495,7 @@ pub fn routes() -> Router {
             post(communities::communities::update_membership_role),
         )
         // ipbans
+        .route("/bans/{ip}", get(auth::ipbans::check_request))
         .route("/bans/{ip}", post(auth::ipbans::create_request))
         .route("/bans/{ip}", delete(auth::ipbans::delete_request))
         // reports
@@ -1031,6 +1036,11 @@ pub struct UpdateAppQuotaStatus {
     pub quota_status: AppQuota,
 }
 
+#[derive(Deserialize)]
+pub struct UpdateAppStorageCapacity {
+    pub storage_capacity: DeveloperPassStorageQuota,
+}
+
 #[derive(Deserialize)]
 pub struct UpdateAppScopes {
     pub scopes: Vec<AppScope>,
diff --git a/crates/app/src/routes/api/v1/notes.rs b/crates/app/src/routes/api/v1/notes.rs
index bba335e..979dbf7 100644
--- a/crates/app/src/routes/api/v1/notes.rs
+++ b/crates/app/src/routes/api/v1/notes.rs
@@ -267,7 +267,7 @@ pub async fn delete_by_dir_request(
 }
 
 pub async fn render_markdown_request(Json(req): Json<RenderMarkdown>) -> impl IntoResponse {
-    tetratto_shared::markdown::render_markdown(&CustomEmoji::replace(&req.content))
+    tetratto_shared::markdown::render_markdown(&CustomEmoji::replace(&req.content), true)
         .replace("\\@", "@")
         .replace("%5C@", "@")
 }
diff --git a/crates/app/src/routes/pages/developer.rs b/crates/app/src/routes/pages/developer.rs
index 0d421f7..a9e5f92 100644
--- a/crates/app/src/routes/pages/developer.rs
+++ b/crates/app/src/routes/pages/developer.rs
@@ -62,7 +62,7 @@ pub async fn app_request(
         ));
     }
 
-    let data_limit = AppData::user_limit(&user);
+    let data_limit = AppData::user_limit(&user, &app);
 
     let lang = get_lang!(jar, data.0);
     let mut context = initial_context(&data.0.0.0, lang, &Some(user)).await;
diff --git a/crates/app/src/routes/pages/profile.rs b/crates/app/src/routes/pages/profile.rs
index 15a3ee8..3f6274b 100644
--- a/crates/app/src/routes/pages/profile.rs
+++ b/crates/app/src/routes/pages/profile.rs
@@ -731,6 +731,21 @@ pub async fn following_request(
 
     check_user_blocked_or_private!(user, other_user, data, jar);
 
+    // check hide_social_follows
+    if other_user.settings.hide_social_follows {
+        if let Some(ref ua) = user {
+            if ua.id != other_user.id {
+                return Err(Html(
+                    render_error(Error::NotAllowed, &jar, &data, &user).await,
+                ));
+            }
+        } else {
+            return Err(Html(
+                render_error(Error::NotAllowed, &jar, &data, &user).await,
+            ));
+        }
+    }
+
     // fetch data
     let list = match data
         .0
@@ -826,6 +841,21 @@ pub async fn followers_request(
 
     check_user_blocked_or_private!(user, other_user, data, jar);
 
+    // check hide_social_follows
+    if other_user.settings.hide_social_follows {
+        if let Some(ref ua) = user {
+            if ua.id != other_user.id {
+                return Err(Html(
+                    render_error(Error::NotAllowed, &jar, &data, &user).await,
+                ));
+            }
+        } else {
+            return Err(Html(
+                render_error(Error::NotAllowed, &jar, &data, &user).await,
+            ));
+        }
+    }
+
     // fetch data
     let list = match data
         .0
diff --git a/crates/core/Cargo.toml b/crates/core/Cargo.toml
index 98a0947..bd7ac03 100644
--- a/crates/core/Cargo.toml
+++ b/crates/core/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "tetratto-core"
 description = "The core behind Tetratto"
-version = "12.0.0"
+version = "12.0.2"
 edition = "2024"
 authors.workspace = true
 repository.workspace = true
@@ -18,7 +18,7 @@ default = ["database", "types", "sdk"]
 pathbufd = "0.1.4"
 serde = { version = "1.0.219", features = ["derive"] }
 toml = "0.9.2"
-tetratto-shared = { version = "12.0.0", path = "../shared" }
+tetratto-shared = { version = "12.0.6", path = "../shared" }
 tetratto-l10n = { version = "12.0.0", path = "../l10n" }
 serde_json = "1.0.141"
 totp-rs = { version = "5.7.0", features = ["qr", "gen_secret"], optional = true }
@@ -35,6 +35,4 @@ oiseau = { version = "0.1.2", default-features = false, features = [
     "redis",
 ], optional = true }
 paste = { version = "1.0.15", optional = true }
-
-[dev-dependencies]
 tokio = { version = "1.46.1", features = ["macros", "rt-multi-thread"] }
diff --git a/crates/core/src/database/app_data.rs b/crates/core/src/database/app_data.rs
index d6225fc..9aeafc1 100644
--- a/crates/core/src/database/app_data.rs
+++ b/crates/core/src/database/app_data.rs
@@ -5,7 +5,7 @@ use crate::{auto_method, DataManager};
 use oiseau::{PostgresRow, execute, get, query_row, query_rows, params};
 
 pub const FREE_DATA_LIMIT: usize = 512_000;
-pub const PASS_DATA_LIMIT: usize = 5_242_880;
+pub const PASS_DATA_LIMIT: usize = 26_214_400;
 
 impl DataManager {
     /// Get a [`AppData`] from an SQL row.
@@ -117,13 +117,13 @@ impl DataManager {
         let app = self.get_app_by_id(data.app).await?;
 
         // check values
-        if data.key.len() < 2 {
+        if data.key.len() < 1 {
             return Err(Error::DataTooShort("key".to_string()));
-        } else if data.key.len() > 32 {
+        } else if data.key.len() > 128 {
             return Err(Error::DataTooLong("key".to_string()));
         }
 
-        if data.value.len() < 2 {
+        if data.value.len() < 1 {
             return Err(Error::DataTooShort("value".to_string()));
         } else if data.value.len() > Self::MAXIMUM_DATA_SIZE {
             return Err(Error::DataTooLong("value".to_string()));
diff --git a/crates/core/src/database/apps.rs b/crates/core/src/database/apps.rs
index b605cb6..72334a8 100644
--- a/crates/core/src/database/apps.rs
+++ b/crates/core/src/database/apps.rs
@@ -1,6 +1,6 @@
 use oiseau::cache::Cache;
 use crate::model::{
-    apps::{AppQuota, ThirdPartyApp},
+    apps::{AppQuota, ThirdPartyApp, DeveloperPassStorageQuota},
     auth::User,
     oauth::AppScope,
     permissions::{FinePermission, SecondaryPermission},
@@ -25,6 +25,7 @@ impl DataManager {
             scopes: serde_json::from_str(&get!(x->9(String))).unwrap(),
             api_key: get!(x->10(String)),
             data_used: get!(x->11(i32)) as usize,
+            storage_capacity: serde_json::from_str(&get!(x->12(String))).unwrap(),
         }
     }
 
@@ -95,7 +96,7 @@ impl DataManager {
 
         let res = execute!(
             &conn,
-            "INSERT INTO apps VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12)",
+            "INSERT INTO apps VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13)",
             params![
                 &(data.id as i64),
                 &(data.created as i64),
@@ -108,7 +109,8 @@ impl DataManager {
                 &(data.grants as i32),
                 &serde_json::to_string(&data.scopes).unwrap(),
                 &data.api_key,
-                &(data.data_used as i32)
+                &(data.data_used as i32),
+                &serde_json::to_string(&data.storage_capacity).unwrap(),
             ]
         );
 
@@ -167,6 +169,7 @@ impl DataManager {
     auto_method!(update_app_quota_status(AppQuota)@get_app_by_id -> "UPDATE apps SET quota_status = $1 WHERE id = $2" --serde --cache-key-tmpl=cache_clear_app);
     auto_method!(update_app_scopes(Vec<AppScope>)@get_app_by_id:FinePermission::MANAGE_APPS; -> "UPDATE apps SET scopes = $1 WHERE id = $2" --serde --cache-key-tmpl=cache_clear_app);
     auto_method!(update_app_api_key(&str)@get_app_by_id -> "UPDATE apps SET api_key = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_app);
+    auto_method!(update_app_storage_capacity(DeveloperPassStorageQuota)@get_app_by_id -> "UPDATE apps SET storage_capacity = $1 WHERE id = $2" --serde --cache-key-tmpl=cache_clear_app);
 
     auto_method!(update_app_data_used(i32)@get_app_by_id -> "UPDATE apps SET data_used = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_app);
     auto_method!(add_app_data_used(i32)@get_app_by_id -> "UPDATE apps SET data_used = data_used + $1 WHERE id = $2" --cache-key-tmpl=cache_clear_app);
diff --git a/crates/core/src/database/auth.rs b/crates/core/src/database/auth.rs
index 3bd8678..4ced643 100644
--- a/crates/core/src/database/auth.rs
+++ b/crates/core/src/database/auth.rs
@@ -100,14 +100,21 @@ impl DataManager {
             tokens: serde_json::from_str(&get!(x->6(String)).to_string()).unwrap(),
             permissions: FinePermission::from_bits(get!(x->7(i32)) as u32).unwrap(),
             is_verified: get!(x->8(i32)) as i8 == 1,
-            notification_count: get!(x->9(i32)) as usize,
+            notification_count: {
+                let x = get!(x->9(i32)) as usize;
+                // we're a little too close to the maximum count, clearly something's gone wrong
+                if x > usize::MAX - 1000 { 0 } else { x }
+            },
             follower_count: get!(x->10(i32)) as usize,
             following_count: get!(x->11(i32)) as usize,
             last_seen: get!(x->12(i64)) as usize,
             totp: get!(x->13(String)),
             recovery_codes: serde_json::from_str(&get!(x->14(String)).to_string()).unwrap(),
             post_count: get!(x->15(i32)) as usize,
-            request_count: get!(x->16(i32)) as usize,
+            request_count: {
+                let x = get!(x->16(i32)) as usize;
+                if x > usize::MAX - 1000 { 0 } else { x }
+            },
             connections: serde_json::from_str(&get!(x->17(String)).to_string()).unwrap(),
             stripe_id: get!(x->18(String)),
             grants: serde_json::from_str(&get!(x->19(String)).to_string()).unwrap(),
diff --git a/crates/core/src/database/common.rs b/crates/core/src/database/common.rs
index d37c330..5e10783 100644
--- a/crates/core/src/database/common.rs
+++ b/crates/core/src/database/common.rs
@@ -44,6 +44,7 @@ impl DataManager {
         execute!(&conn, common::CREATE_TABLE_SERVICES).unwrap();
         execute!(&conn, common::CREATE_TABLE_PRODUCTS).unwrap();
         execute!(&conn, common::CREATE_TABLE_APP_DATA).unwrap();
+        execute!(&conn, common::CREATE_TABLE_LETTERS).unwrap();
 
         for x in common::VERSION_MIGRATIONS.split(";") {
             execute!(&conn, x).unwrap();
diff --git a/crates/core/src/database/drivers/common.rs b/crates/core/src/database/drivers/common.rs
index d2239a6..bccbfb9 100644
--- a/crates/core/src/database/drivers/common.rs
+++ b/crates/core/src/database/drivers/common.rs
@@ -32,3 +32,4 @@ pub const CREATE_TABLE_DOMAINS: &str = include_str!("./sql/create_domains.sql");
 pub const CREATE_TABLE_SERVICES: &str = include_str!("./sql/create_services.sql");
 pub const CREATE_TABLE_PRODUCTS: &str = include_str!("./sql/create_products.sql");
 pub const CREATE_TABLE_APP_DATA: &str = include_str!("./sql/create_app_data.sql");
+pub const CREATE_TABLE_LETTERS: &str = include_str!("./sql/create_letters.sql");
diff --git a/crates/core/src/database/drivers/sql/create_apps.sql b/crates/core/src/database/drivers/sql/create_apps.sql
index d01ed41..70f2b8d 100644
--- a/crates/core/src/database/drivers/sql/create_apps.sql
+++ b/crates/core/src/database/drivers/sql/create_apps.sql
@@ -9,5 +9,6 @@ CREATE TABLE IF NOT EXISTS apps (
     banned INT NOT NULL,
     grants INT NOT NULL,
     scopes TEXT NOT NULL,
-    data_used INT NOT NULL CHECK (data_used >= 0)
+    data_used INT NOT NULL CHECK (data_used >= 0),
+    storage_capacity TEXT NOT NULL
 )
diff --git a/crates/core/src/database/drivers/sql/create_letters.sql b/crates/core/src/database/drivers/sql/create_letters.sql
new file mode 100644
index 0000000..f3100eb
--- /dev/null
+++ b/crates/core/src/database/drivers/sql/create_letters.sql
@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS letters (
+    id BIGINT NOT NULL PRIMARY KEY,
+    created BIGINT NOT NULL,
+    owner BIGINT NOT NULL,
+    receivers TEXT NOT NULL,
+    subject TEXT NOT NULL,
+    content TEXT NOT NULL,
+    read_by TEXT NOT NULL
+)
diff --git a/crates/core/src/database/drivers/sql/version_migrations.sql b/crates/core/src/database/drivers/sql/version_migrations.sql
index c0c863a..c101e7d 100644
--- a/crates/core/src/database/drivers/sql/version_migrations.sql
+++ b/crates/core/src/database/drivers/sql/version_migrations.sql
@@ -5,3 +5,11 @@ ADD COLUMN IF NOT EXISTS channel_mutes TEXT DEFAULT '[]';
 -- users is_deactivated
 ALTER TABLE users
 ADD COLUMN IF NOT EXISTS is_deactivated INT DEFAULT 0;
+
+-- apps storage_capacity
+ALTER TABLE apps
+ADD COLUMN IF NOT EXISTS storage_capacity TEXT DEFAULT '"Tier1"';
+
+-- letters replying_to
+ALTER TABLE letters
+ADD COLUMN IF NOT EXISTS replying_to TEXT DEFAULT 0;
diff --git a/crates/core/src/database/letters.rs b/crates/core/src/database/letters.rs
new file mode 100644
index 0000000..fe9bbac
--- /dev/null
+++ b/crates/core/src/database/letters.rs
@@ -0,0 +1,170 @@
+use crate::model::{auth::User, mail::Letter, permissions::SecondaryPermission, Error, Result};
+use crate::{auto_method, DataManager};
+use oiseau::{cache::Cache, execute, get, params, query_rows, PostgresRow};
+
+impl DataManager {
+    /// Get a [`Letter`] from an SQL row.
+    pub(crate) fn get_letter_from_row(x: &PostgresRow) -> Letter {
+        Letter {
+            id: get!(x->0(i64)) as usize,
+            created: get!(x->1(i64)) as usize,
+            owner: get!(x->2(i64)) as usize,
+            receivers: serde_json::from_str(&get!(x->3(String))).unwrap(),
+            subject: get!(x->4(String)),
+            content: get!(x->5(String)),
+            read_by: serde_json::from_str(&get!(x->6(String))).unwrap(),
+            replying_to: get!(x->7(i32)) as usize,
+        }
+    }
+
+    auto_method!(get_letter_by_id(usize as i64)@get_letter_from_row -> "SELECT * FROM letters WHERE id = $1" --name="letter" --returns=Letter --cache-key-tmpl="atto.letter:{}");
+
+    /// Get all letters by user.
+    ///
+    /// # Arguments
+    /// * `id` - the ID of the user to fetch letters for
+    pub async fn get_letters_by_user(&self, id: usize) -> Result<Vec<Letter>> {
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = query_rows!(
+            &conn,
+            "SELECT * FROM letters WHERE owner = $1 ORDER BY created DESC",
+            &[&(id as i64)],
+            |x| { Self::get_letter_from_row(x) }
+        );
+
+        if res.is_err() {
+            return Err(Error::GeneralNotFound("letter".to_string()));
+        }
+
+        Ok(res.unwrap())
+    }
+
+    /// Get all letters by user (where user is a receiver).
+    ///
+    /// # Arguments
+    /// * `id` - the ID of the user to fetch letters for
+    pub async fn get_received_letters_by_user(&self, id: usize) -> Result<Vec<Letter>> {
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = query_rows!(
+            &conn,
+            "SELECT * FROM letters WHERE receivers LIKE $1 ORDER BY created DESC",
+            &[&format!("%\"{id}\"%")],
+            |x| { Self::get_letter_from_row(x) }
+        );
+
+        if res.is_err() {
+            return Err(Error::GeneralNotFound("letter".to_string()));
+        }
+
+        Ok(res.unwrap())
+    }
+
+    /// Get all letters which are replying to the given letter.
+    ///
+    /// # Arguments
+    /// * `id` - the ID of the letter to fetch letters for
+    pub async fn get_letters_by_replying_to(&self, id: usize) -> Result<Vec<Letter>> {
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = query_rows!(
+            &conn,
+            "SELECT * FROM letters WHERE replying_to = $1 ORDER BY created DESC",
+            &[&(id as i64)],
+            |x| { Self::get_letter_from_row(x) }
+        );
+
+        if res.is_err() {
+            return Err(Error::GeneralNotFound("letter".to_string()));
+        }
+
+        Ok(res.unwrap())
+    }
+
+    /// Create a new letter in the database.
+    ///
+    /// # Arguments
+    /// * `data` - a mock [`Letter`] object to insert
+    pub async fn create_letter(&self, data: Letter) -> Result<Letter> {
+        // check values
+        if data.subject.len() < 2 {
+            return Err(Error::DataTooShort("subject".to_string()));
+        } else if data.subject.len() > 256 {
+            return Err(Error::DataTooLong("subject".to_string()));
+        }
+
+        if data.content.len() < 2 {
+            return Err(Error::DataTooShort("content".to_string()));
+        } else if data.content.len() > 16384 {
+            return Err(Error::DataTooLong("content".to_string()));
+        }
+
+        // ...
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = execute!(
+            &conn,
+            "INSERT INTO letters VALUES ($1, $2, $3, $4, $5, $6, $7, $8)",
+            params![
+                &(data.id as i64),
+                &(data.created as i64),
+                &(data.owner as i64),
+                &serde_json::to_string(&data.receivers).unwrap(),
+                &data.subject,
+                &data.content,
+                &serde_json::to_string(&data.read_by).unwrap(),
+                &(data.replying_to as i64)
+            ]
+        );
+
+        if let Err(e) = res {
+            return Err(Error::DatabaseError(e.to_string()));
+        }
+
+        Ok(data)
+    }
+
+    pub async fn delete_letter(&self, id: usize, user: &User) -> Result<()> {
+        let letter = self.get_letter_by_id(id).await?;
+
+        // check user permission
+        if user.id != letter.owner
+            && !user
+                .secondary_permissions
+                .check(SecondaryPermission::MANAGE_LETTERS)
+        {
+            return Err(Error::NotAllowed);
+        }
+
+        // ...
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = execute!(&conn, "DELETE FROM letters WHERE id = $1", &[&(id as i64)]);
+
+        if let Err(e) = res {
+            return Err(Error::DatabaseError(e.to_string()));
+        }
+
+        // ...
+        self.0.1.remove(format!("atto.letter:{}", id)).await;
+        Ok(())
+    }
+
+    auto_method!(update_letter_read_by(Vec<usize>) -> "UPDATE letters SET read_by = $1 WHERE id = $2" --serde --cache-key-tmpl="atto.letter:{}");
+}
diff --git a/crates/core/src/database/mod.rs b/crates/core/src/database/mod.rs
index 80b77a1..218bcd6 100644
--- a/crates/core/src/database/mod.rs
+++ b/crates/core/src/database/mod.rs
@@ -14,6 +14,7 @@ mod invite_codes;
 mod ipbans;
 mod ipblocks;
 mod journals;
+mod letters;
 mod memberships;
 mod message_reactions;
 mod messages;
diff --git a/crates/core/src/database/questions.rs b/crates/core/src/database/questions.rs
index 7722250..3703d4f 100644
--- a/crates/core/src/database/questions.rs
+++ b/crates/core/src/database/questions.rs
@@ -408,6 +408,10 @@ impl DataManager {
 
             // check muted phrases
             for phrase in receiver.settings.muted {
+                if phrase.is_empty() {
+                    continue;
+                }
+
                 if data.content.contains(&phrase) {
                     // act like the question was created so theyre less likely to try and send it again or bypass
                     return Ok(0);
diff --git a/crates/core/src/html.rs b/crates/core/src/html.rs
new file mode 100644
index 0000000..73c42e1
--- /dev/null
+++ b/crates/core/src/html.rs
@@ -0,0 +1,97 @@
+use std::{
+    collections::HashMap,
+    fs::{exists, read_to_string, write},
+    sync::LazyLock,
+};
+use tokio::sync::RwLock;
+
+use pathbufd::PathBufD;
+
+/// A container for all loaded icons.
+pub static ICONS: LazyLock<RwLock<HashMap<String, String>>> =
+    LazyLock::new(|| RwLock::new(HashMap::new()));
+
+/// Pull an icon given its name and insert it into [`ICONS`].
+pub async fn pull_icon(icon: &str, icons_dir: &str) {
+    let writer = &mut ICONS.write().await;
+
+    let icon_url = format!(
+        "https://raw.githubusercontent.com/lucide-icons/lucide/refs/heads/main/icons/{icon}.svg"
+    );
+
+    let file_path = PathBufD::current().extend(&[icons_dir, &format!("{icon}.svg")]);
+
+    if exists(&file_path).unwrap_or(false) {
+        writer.insert(icon.to_string(), read_to_string(&file_path).unwrap());
+        return;
+    }
+
+    println!("download icon: {icon}");
+    let svg = reqwest::get(icon_url)
+        .await
+        .unwrap()
+        .text()
+        .await
+        .unwrap()
+        .replace("\n", "");
+
+    write(&file_path, &svg).unwrap();
+    writer.insert(icon.to_string(), svg);
+}
+
+/// Read a string and pull all icons found within it.
+pub async fn pull_icons(mut input: String, icon_dir: &str) -> String {
+    // icon (with class)
+    let icon_with_class =
+        regex::Regex::new("(\\{\\{)\\s*(icon)\\s*(.*?)\\s*c\\((.*?)\\)\\s*(\\}\\})").unwrap();
+
+    for cap in icon_with_class.captures_iter(&input.clone()) {
+        let cap_str = &cap.get(3).unwrap().as_str().replace("\"", "");
+        let icon = &(if cap_str.contains(" }}") {
+            cap_str.split(" }}").next().unwrap().to_string()
+        } else {
+            cap_str.to_string()
+        });
+
+        pull_icon(icon, icon_dir).await;
+
+        let reader = ICONS.read().await;
+        let icon_text = reader.get(icon).unwrap().replace(
+            "<svg",
+            &format!("<svg class=\"icon {}\"", cap.get(4).unwrap().as_str()),
+        );
+
+        input = input.replace(
+            &format!(
+                "{{{{ icon \"{cap_str}\" c({}) }}}}",
+                cap.get(4).unwrap().as_str()
+            ),
+            &icon_text,
+        );
+    }
+
+    // icon (without class)
+    let icon_without_class = regex::Regex::new("(\\{\\{)\\s*(icon)\\s*(.*?)\\s*(\\}\\})").unwrap();
+
+    for cap in icon_without_class.captures_iter(&input.clone()) {
+        let cap_str = &cap.get(3).unwrap().as_str().replace("\"", "");
+        let icon = &(if cap_str.contains(" }}") {
+            cap_str.split(" }}").next().unwrap().to_string()
+        } else {
+            cap_str.to_string()
+        });
+
+        pull_icon(icon, icon_dir).await;
+
+        let reader = ICONS.read().await;
+        let icon_text = reader
+            .get(icon)
+            .unwrap()
+            .replace("<svg", "<svg class=\"icon\"");
+
+        input = input.replace(&format!("{{{{ icon \"{cap_str}\" }}}}",), &icon_text);
+    }
+
+    // ...
+    input
+}
diff --git a/crates/core/src/lib.rs b/crates/core/src/lib.rs
index b785f89..efe184d 100644
--- a/crates/core/src/lib.rs
+++ b/crates/core/src/lib.rs
@@ -3,6 +3,8 @@ pub mod config;
 #[cfg(feature = "database")]
 pub mod database;
 #[cfg(feature = "types")]
+pub mod html;
+#[cfg(feature = "types")]
 pub mod model;
 #[cfg(feature = "sdk")]
 pub mod sdk;
diff --git a/crates/core/src/model/apps.rs b/crates/core/src/model/apps.rs
index 309d850..470bc8b 100644
--- a/crates/core/src/model/apps.rs
+++ b/crates/core/src/model/apps.rs
@@ -21,6 +21,35 @@ impl Default for AppQuota {
     }
 }
 
+/// The storage limit for apps where the owner has a developer pass.
+///
+/// Free users are always limited to 500 KB.
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq)]
+pub enum DeveloperPassStorageQuota {
+    /// The app is limited to 25 MB.
+    Tier1,
+    /// The app is limited to 50 MB.
+    Tier2,
+    /// The app is limited to 100 MB.
+    Tier3,
+}
+
+impl Default for DeveloperPassStorageQuota {
+    fn default() -> Self {
+        Self::Tier1
+    }
+}
+
+impl DeveloperPassStorageQuota {
+    pub fn limit(&self) -> usize {
+        match self {
+            DeveloperPassStorageQuota::Tier1 => 26214400,
+            DeveloperPassStorageQuota::Tier2 => 52428800,
+            DeveloperPassStorageQuota::Tier3 => 104857600,
+        }
+    }
+}
+
 /// An app is required to request grants on user accounts.
 ///
 /// Users must approve grants through a web portal.
@@ -90,6 +119,8 @@ pub struct ThirdPartyApp {
     pub api_key: String,
     /// The number of bytes the app's app_data rows are using.
     pub data_used: usize,
+    /// The app's storage capacity.
+    pub storage_capacity: DeveloperPassStorageQuota,
 }
 
 impl ThirdPartyApp {
@@ -102,12 +133,13 @@ impl ThirdPartyApp {
             title,
             homepage,
             redirect,
-            quota_status: AppQuota::Limited,
+            quota_status: AppQuota::default(),
             banned: false,
             grants: 0,
             scopes: Vec::new(),
             api_key: String::new(),
             data_used: 0,
+            storage_capacity: DeveloperPassStorageQuota::default(),
         }
     }
 }
@@ -132,12 +164,16 @@ impl AppData {
     }
 
     /// Get the data limit of a given user.
-    pub fn user_limit(user: &User) -> usize {
+    pub fn user_limit(user: &User, app: &ThirdPartyApp) -> usize {
         if user
             .secondary_permissions
             .check(SecondaryPermission::DEVELOPER_PASS)
         {
-            PASS_DATA_LIMIT
+            if app.storage_capacity != DeveloperPassStorageQuota::Tier1 {
+                app.storage_capacity.limit()
+            } else {
+                PASS_DATA_LIMIT
+            }
         } else {
             FREE_DATA_LIMIT
         }
diff --git a/crates/core/src/model/auth.rs b/crates/core/src/model/auth.rs
index 37d2bf9..2e45b73 100644
--- a/crates/core/src/model/auth.rs
+++ b/crates/core/src/model/auth.rs
@@ -1,5 +1,4 @@
 use std::collections::HashMap;
-
 use super::{
     oauth::AuthGrant,
     permissions::{FinePermission, SecondaryPermission},
@@ -338,6 +337,10 @@ pub struct UserSettings {
     /// Biography shown on `profile/private.lisp` page.
     #[serde(default)]
     pub private_biography: String,
+    /// If the followers/following links are hidden from the user's profile.
+    /// Will also revoke access to their respective pages.
+    #[serde(default)]
+    pub hide_social_follows: bool,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, Default)]
diff --git a/crates/core/src/model/mail.rs b/crates/core/src/model/mail.rs
new file mode 100644
index 0000000..8336821
--- /dev/null
+++ b/crates/core/src/model/mail.rs
@@ -0,0 +1,44 @@
+use serde::{Serialize, Deserialize};
+use tetratto_shared::{snow::Snowflake, unix_epoch_timestamp};
+
+/// A letter is the most basic structure of the mail system. Letters are sent
+/// and received by users.
+#[derive(Serialize, Deserialize)]
+pub struct Letter {
+    pub id: usize,
+    pub created: usize,
+    pub owner: usize,
+    pub receivers: Vec<usize>,
+    pub subject: String,
+    pub content: String,
+    /// The ID of every use who has read the letter. Can be checked in the UI
+    /// with `user.id in letter.read_by`.
+    ///
+    /// This field can be updated by anyone in the letter's `receivers` field.
+    /// Other fields in the letter can only be updated by the letter's `owner`.
+    pub read_by: Vec<usize>,
+    /// The ID of the letter this letter is replying to.
+    pub replying_to: usize,
+}
+
+impl Letter {
+    /// Create a new [`Letter`].
+    pub fn new(
+        owner: usize,
+        receivers: Vec<usize>,
+        subject: String,
+        content: String,
+        replying_to: usize,
+    ) -> Self {
+        Self {
+            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
+            created: unix_epoch_timestamp(),
+            owner,
+            receivers,
+            subject,
+            content,
+            read_by: Vec::new(),
+            replying_to,
+        }
+    }
+}
diff --git a/crates/core/src/model/mod.rs b/crates/core/src/model/mod.rs
index 7d7f19e..06c4149 100644
--- a/crates/core/src/model/mod.rs
+++ b/crates/core/src/model/mod.rs
@@ -7,6 +7,7 @@ pub mod communities;
 pub mod communities_permissions;
 pub mod journals;
 pub mod littleweb;
+pub mod mail;
 pub mod moderation;
 pub mod oauth;
 pub mod permissions;
diff --git a/crates/core/src/model/permissions.rs b/crates/core/src/model/permissions.rs
index 796b9f1..61ebb61 100644
--- a/crates/core/src/model/permissions.rs
+++ b/crates/core/src/model/permissions.rs
@@ -178,6 +178,7 @@ bitflags! {
         const MANAGE_SERVICES = 1 << 3;
         const MANAGE_PRODUCTS = 1 << 4;
         const DEVELOPER_PASS = 1 << 5;
+        const MANAGE_LETTERS = 1 << 6;
 
         const _ = !0;
     }
diff --git a/crates/core/src/sdk.rs b/crates/core/src/sdk.rs
index 71ba502..0e5add6 100644
--- a/crates/core/src/sdk.rs
+++ b/crates/core/src/sdk.rs
@@ -75,6 +75,22 @@ impl DataClient {
         }
     }
 
+    /// Check if the given IP is IP banned from the Tetratto host. You will only know
+    /// if the IP is banned or not, meaning you will not be shown the reason if it
+    /// is banned.
+    pub async fn check_ip(&self, ip: &str) -> Result<bool> {
+        match self
+            .http
+            .get(format!("{}/api/v1/bans/{}", self.host, ip))
+            .header("Atto-Secret-Key", &self.api_key)
+            .send()
+            .await
+        {
+            Ok(x) => api_return_ok!(bool, x),
+            Err(e) => Err(Error::MiscError(e.to_string())),
+        }
+    }
+
     /// Query the app's data.
     pub async fn query(&self, query: &SimplifiedQuery) -> Result<AppDataQueryResult> {
         match self
diff --git a/crates/shared/Cargo.toml b/crates/shared/Cargo.toml
index 02b14fc..a866bd1 100644
--- a/crates/shared/Cargo.toml
+++ b/crates/shared/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "tetratto-shared"
 description = "Shared stuff for Tetratto"
-version = "12.0.0"
+version = "12.0.6"
 edition = "2024"
 authors.workspace = true
 repository.workspace = true
@@ -10,9 +10,10 @@ license.workspace = true
 [dependencies]
 ammonia = "4.1.1"
 chrono = "0.4.41"
-markdown = "1.0.0"
 hex_fmt = "0.3.0"
+pulldown-cmark = "0.13.0"
 rand = "0.9.1"
+regex = "1.11.1"
 serde = { version = "1.0.219", features = ["derive"] }
 sha2 = "0.10.9"
 snowflaked = "1.0.3"
diff --git a/crates/shared/src/markdown.rs b/crates/shared/src/markdown.rs
index 82d6b79..022e23d 100644
--- a/crates/shared/src/markdown.rs
+++ b/crates/shared/src/markdown.rs
@@ -1,36 +1,42 @@
 use ammonia::Builder;
-use markdown::{to_html_with_options, Options, CompileOptions, ParseOptions, Constructs};
+use pulldown_cmark::{Parser, Options, html::push_html};
 use std::collections::HashSet;
 
-/// Render markdown input into HTML
-pub fn render_markdown(input: &str) -> String {
-    let options = Options {
-        compile: CompileOptions {
-            allow_any_img_src: false,
-            allow_dangerous_html: true,
-            allow_dangerous_protocol: true,
-            gfm_task_list_item_checkable: false,
-            gfm_tagfilter: false,
-            ..Default::default()
-        },
-        parse: ParseOptions {
-            constructs: Constructs {
-                math_flow: true,
-                math_text: true,
-                ..Constructs::gfm()
-            },
-            gfm_strikethrough_single_tilde: false,
-            math_text_single_dollar: false,
-            mdx_expression_parse: None,
-            mdx_esm_parse: None,
-            ..Default::default()
-        },
-    };
+pub fn render_markdown_dirty(input: &str) -> String {
+    let input = &autolinks(&parse_alignment(&parse_backslash_breaks(input)));
 
-    let html = match to_html_with_options(input, &options) {
-        Ok(h) => h,
-        Err(e) => e.to_string(),
-    };
+    let mut options = Options::empty();
+    options.insert(Options::ENABLE_STRIKETHROUGH);
+    options.insert(Options::ENABLE_GFM);
+    options.insert(Options::ENABLE_FOOTNOTES);
+    options.insert(Options::ENABLE_TABLES);
+    options.insert(Options::ENABLE_HEADING_ATTRIBUTES);
+    options.insert(Options::ENABLE_SUBSCRIPT);
+
+    let parser = Parser::new_ext(input, options);
+
+    let mut html = String::new();
+    push_html(&mut html, parser);
+
+    html
+}
+
+pub fn clean_html(html: String, allowed_attributes: HashSet<&str>) -> String {
+    Builder::default()
+        .generic_attributes(allowed_attributes)
+        .add_tags(&[
+            "video", "source", "img", "b", "span", "p", "i", "strong", "em", "a", "align",
+        ])
+        .rm_tags(&["script", "style", "link", "canvas"])
+        .add_tag_attributes("a", &["href", "target"])
+        .add_url_schemes(&["atto"])
+        .clean(&html.replace("<video ", "<video controls "))
+        .to_string()
+}
+
+/// Render markdown input into HTML
+pub fn render_markdown(input: &str, proxy_images: bool) -> String {
+    let html = render_markdown_dirty(input);
 
     let mut allowed_attributes = HashSet::new();
     allowed_attributes.insert("id");
@@ -42,22 +48,178 @@ pub fn render_markdown(input: &str) -> String {
     allowed_attributes.insert("align");
     allowed_attributes.insert("src");
 
-    Builder::default()
-        .generic_attributes(allowed_attributes)
-        .add_tags(&[
-            "video", "source", "img", "b", "span", "p", "i", "strong", "em", "a",
-        ])
-        .rm_tags(&["script", "style", "link", "canvas"])
-        .add_tag_attributes("a", &["href", "target"])
-        .add_url_schemes(&["atto"])
-        .clean(&html)
-        .to_string()
-        .replace(
+    let output = clean_html(html, allowed_attributes);
+
+    if proxy_images {
+        output.replace(
             "src=\"http",
             "loading=\"lazy\" src=\"/api/v1/util/proxy?url=http",
         )
-        .replace("<video loading=", "<video controls loading=")
-        .replace("--&gt;", "<align class=\"right\">")
-        .replace("-&gt;", "<align class=\"center\">")
-        .replace("&lt;-", "</align>")
+    } else {
+        output
+    }
+}
+
+fn parse_alignment_line(line: &str, output: &mut String, buffer: &mut String, is_in_pre: bool) {
+    if is_in_pre {
+        output.push_str(&format!("{line}\n"));
+        return;
+    }
+
+    let mut is_alignment_waiting: bool = false;
+    let mut alignment_center: bool = false;
+    let mut has_dash: bool = false;
+    let mut escape: bool = false;
+
+    for char in line.chars() {
+        if alignment_center && char != '-' {
+            // last char was <, but we didn't receive a hyphen directly after
+            alignment_center = false;
+            buffer.push('<');
+        }
+
+        if has_dash && char != '>' {
+            // the last char was -, meaning we need to flip has_dash and push the char since we haven't used it
+            has_dash = false;
+            buffer.push('-');
+        }
+
+        match char {
+            '\\' => {
+                escape = true;
+                continue;
+            }
+            '-' => {
+                if escape {
+                    buffer.push(char);
+                    escape = false;
+                    continue;
+                }
+
+                if alignment_center && is_alignment_waiting {
+                    // this means the previous element was <, so we're wrapping up alignment now
+                    alignment_center = false;
+                    is_alignment_waiting = false;
+                    output.push_str(&format!("<align class=\"center\">{buffer}</align>"));
+                    buffer.clear();
+                    continue;
+                }
+
+                has_dash = true;
+
+                if !is_alignment_waiting {
+                    // we need to go ahead and push/clear the buffer so we don't capture the stuff that came before this
+                    // this only needs to be done on the first of these for a single alignment block
+                    output.push_str(&buffer);
+                    buffer.clear();
+                }
+            }
+            '<' => {
+                if escape {
+                    buffer.push(char);
+                    escape = false;
+                    continue;
+                }
+
+                alignment_center = true;
+                continue;
+            }
+            '>' => {
+                if escape {
+                    buffer.push(char);
+                    escape = false;
+                    continue;
+                }
+
+                if has_dash {
+                    has_dash = false;
+
+                    // if we're already waiting for aligmment, this means this is the SECOND aligner arrow
+                    if is_alignment_waiting {
+                        is_alignment_waiting = false;
+                        output.push_str(&format!("<align class=\"right\">{buffer}</align>"));
+                        buffer.clear();
+                        continue;
+                    }
+
+                    // we're now waiting for the next aligner
+                    is_alignment_waiting = true;
+                    continue;
+                } else {
+                    buffer.push('>');
+                }
+            }
+            _ => buffer.push(char),
+        }
+
+        escape = false;
+    }
+
+    output.push_str(&format!("{buffer}\n"));
+    buffer.clear();
+}
+
+pub fn parse_alignment(input: &str) -> String {
+    let lines = input.split("\n");
+
+    let mut is_in_pre: bool = false;
+    let mut output = String::new();
+    let mut buffer = String::new();
+
+    for line in lines {
+        if line.starts_with("```") {
+            is_in_pre = !is_in_pre;
+            output.push_str(&format!("{line}\n"));
+        } else {
+            parse_alignment_line(line, &mut output, &mut buffer, is_in_pre)
+        }
+    }
+
+    output.push_str(&buffer);
+    output
+}
+
+pub fn parse_backslash_breaks(input: &str) -> String {
+    let mut in_pre_block = false;
+    let mut output = String::new();
+
+    for line in input.split("\n") {
+        if line.starts_with("```") {
+            in_pre_block = !in_pre_block;
+            output.push_str(&format!("{line}\n"));
+            continue;
+        }
+
+        if in_pre_block {
+            output.push_str(&format!("{line}\n"));
+            continue;
+        }
+
+        if line.trim_end().ends_with("\\") {
+            output.push_str(&format!("{line}<br />\n"));
+        } else {
+            output.push_str(&format!("{line}\n"));
+        }
+    }
+
+    output
+}
+
+/// Adapted from <https://git.cypr.io/oz/autolink-rust>.
+///
+/// The only real change here is that autolinks require a whitespace OR end the
+/// end of the pattern to match here.
+pub fn autolinks(input: &str) -> String {
+    if input.len() == 0 {
+        return String::new();
+    }
+
+    let pattern = regex::Regex::new(
+        r"(?ix)\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))(\s|$)",
+    )
+    .unwrap();
+
+    pattern
+        .replace_all(input, "<a href=\"$0\">$0</a> ")
+        .to_string()
 }