The app you've been looking for is here you can see millions of open profiles right away.
With See log you can analyze view stories secretly view all hidden accounts. You are completely hidden no one can see you or notice that you are watching.
You can find those who unfollow you those who don't follow you back
You can see those who accepted your request that you didn't follow back.
Your friend blocked you and you're wondering what you're doing right now is your ex with other people or your acquaintances are sharing stories that you shouldn't see. With See log you can see everyone you can reach every share you are curious about.
You can also do your own profile analysis look at ig reports

Hidden profile viewing
Secret story tracking
stay in ghost mode
View unfollowers
View what they don't follow back
See who accepts follow requests
See unfollowers!