diff --git a/masto-mutuals.py b/masto-mutuals.py
new file mode 100644
index 0000000..c584f08
--- /dev/null
+++ b/masto-mutuals.py
@@ -0,0 +1,46 @@
+#!/usr/bin/python3
+
+from mastodon import Mastodon
+
+mastodon = Mastodon(
+    access_token = 'apptoken.secret', #app authtoken
+    api_base_url = 'https://lgbt.io'
+)
+
+user_id = mastodon.me()['id']
+
+def fetch_user_ids(func, idval=user_id):
+    user_ids = []
+    initial = True
+    while True:
+        users = func(idval) if initial else mastodon.fetch_next(users)
+        initial = False
+        if users is None or len(users)==0:
+            break
+        for user in users:
+            user_ids.append(user['id'])
+    return user_ids
+
+followed_ids = fetch_user_ids(mastodon.account_following)
+follower_ids = fetch_user_ids(mastodon.account_followers)
+mutual_ids = [i for i in followed_ids if i in followed_ids and i in follower_ids]
+
+list_id = None
+for l in mastodon.lists():
+    if l['title'] == 'mutuals':
+        list_id = l['id']
+    if list_id is not None:
+        break
+if list_id is None:
+    l = mastodon.list_create('mutuals')
+    list_id = l['id']
+
+list_ids = fetch_user_ids(mastodon.list_accounts, idval=list_id)
+toadd_ids = [i for i in mutual_ids if i not in list_ids]
+torm_ids = [i for i in list_ids if i not in mutual_ids]
+
+if len(toadd_ids) > 0:
+    mastodon.list_accounts_add(list_id, toadd_ids)
+
+if len(torm_ids) > 0:
+    mastodon.list_accounts_delete(list_id, torm_ids)