diff --git a/app/apps.py b/app/apps.py
index 1e8d7a6..dcc9c08 100644
--- a/app/apps.py
+++ b/app/apps.py
@@ -51,6 +51,9 @@ def load_appstream():
                 p.sadd("types:index", type)
                 p.sadd(f"types:{type}", redis_key)
 
+            if extends := apps[appid].get("extends"):
+                p.sadd(f"addons:{extends}", redis_key)
+
             if categories := apps[appid].get("categories"):
                 for category in categories:
                     p.sadd("categories:index", category)
@@ -62,6 +65,7 @@ def load_appstream():
                 f"fts:{appid}",
                 f"summary:{appid}",
                 f"app_stats:{appid}",
+                f"addons:{appid}",
             )
             db.redis_search.delete_document(f"fts:{appid}")
 
@@ -103,6 +107,16 @@ def get_developer(developer: str):
         return []
 
 
+def get_addons(appid: str):
+    if index := db.redis_conn.smembers(f"addons:{appid}"):
+        json_appdata = db.redis_conn.mget(index)
+        appdata = [json.loads(app) for app in json_appdata]
+
+        return [(app["id"]) for app in appdata]
+    else:
+        return []
+
+
 def search(query: str):
     if results := db.search(query):
         appids = tuple(doc_id.replace("fts", "apps") for doc_id in results)
diff --git a/app/main.py b/app/main.py
index f495cf3..7fcb7f7 100644
--- a/app/main.py
+++ b/app/main.py
@@ -1,3 +1,4 @@
+from collections import defaultdict
 from functools import lru_cache
 
 import sentry_sdk
@@ -122,6 +123,21 @@ def get_developer(
     return sorted_ids
 
 
+@app.get("/addon/{appid}")
+def get_addons(appid: str):
+    ids = apps.get_addons(appid)
+
+    addon_appstreams = defaultdict()
+    for addonid in ids:
+        addon_appstreams[addonid] = db.get_json_key(f"apps:{addonid}")
+    sorted_ids = sorted(
+        ids,
+        key=lambda appid: addon_appstreams[appid].get("name", "Unknown"),
+    )
+
+    return sorted_ids
+
+
 @app.get("/appstream")
 def list_appstream(type: schemas.Type = schemas.Type.Desktop):
     return apps.list_appstream(type)