A free program for Android, by One Tap Labs.

If you like to get insight into your Instagram followers, then the Followers & Unfollowers is a practical tool to provide you with the information you need. It helps you get a detailed report about the status of your following.

The application lets you know about users who don’t follow you back and gives you the option to unfollow them instantly. You can also put a star on select followers so that they you don’t get unfollowed.

Additionally, you will be able to identify mutual followers, users you don’t follow, and those who recently unfollowed you. And with a multiple login feature, you can quickly switch between Instagram accounts.