diff --git a/crates/app/src/public/html/profile/settings.lisp b/crates/app/src/public/html/profile/settings.lisp
index d317d95..33f6117 100644
--- a/crates/app/src/public/html/profile/settings.lisp
+++ b/crates/app/src/public/html/profile/settings.lisp
@@ -579,7 +579,9 @@
                                 (li
                                     (text "Ability to create forges"))
                                 (li
-                                    (text "Ability to create more than 1 app")))
+                                    (text "Ability to create more than 1 app"))
+                                (li
+                                    (text "Create up to 10 stack blocks")))
                             (a
                                 ("href" "{{ config.stripe.payment_link }}?client_reference_id={{ user.id }}")
                                 ("class" "button")
diff --git a/crates/core/src/database/stackblocks.rs b/crates/core/src/database/stackblocks.rs
index 0ae9e82..8d2d633 100644
--- a/crates/core/src/database/stackblocks.rs
+++ b/crates/core/src/database/stackblocks.rs
@@ -112,12 +112,34 @@ impl DataManager {
         Ok(res.unwrap())
     }
 
+    const MAXIMUM_FREE_STACKBLOCKS: usize = 5;
+    const MAXIMUM_SUPPORTER_STACKBLOCKS: usize = 10;
+
     /// Create a new stack block in the database.
     ///
     /// # Arguments
     /// * `data` - a mock [`StackBlock`] object to insert
     pub async fn create_stackblock(&self, data: StackBlock) -> Result<()> {
         let initiator = self.get_user_by_id(data.initiator).await?;
+
+        // check number of stackblocks
+        let stackblocks = self.get_stackblocks_by_initiator(data.initiator).await;
+
+        if !initiator.permissions.check(FinePermission::SUPPORTER) {
+            if stackblocks.len() >= Self::MAXIMUM_FREE_STACKBLOCKS {
+                return Err(Error::MiscError(
+                    "You already have the maximum number of stack blocks you can have".to_string(),
+                ));
+            }
+        } else {
+            if stackblocks.len() >= Self::MAXIMUM_SUPPORTER_STACKBLOCKS {
+                return Err(Error::MiscError(
+                    "You already have the maximum number of stack blocks you can have".to_string(),
+                ));
+            }
+        }
+
+        // ...
         let stack = self.get_stack_by_id(data.stack).await?;
 
         if initiator.id != stack.owner