Followers is the app that allows you to view the information related to your instagram profile.
You can unfollow up to 50 people who don't follow you. You can even whitelist people so you don't stop following them.
It also gives you information on mutual followers, people you don't follow.
You can switch sessions between multiple instagram accounts simultaneously.

Main Features:
Stop following someone who does not follow you.
Mutual: People you follow and they follow you.
Knowing people who follow you but you are not following them.
Know who recently unfollowed you.
Stop following multiple people with just one click.