Every "who unfollowed me" tool wants your Instagram password. FollowStack never asks for one — it is a Chrome extension, so it uses the session you are already logged into and analyses everything locally. See who unfollowed you since your last check, who does not follow back, and which followers are bots or ghosts, scored on profile photo, follower ratio, post count and username. Export to CSV, Excel or JSON, schedule stories from desktop, download media. Free tier. 51 languages.