Unfollowers Tracker is a free Android app developed by Otoyaz that provides Instagram users with a follower management tool. With this app, users can easily detect who is not following them back and who they do not follow back. Additionally, the app offers features such as tracking stories, saving them to the gallery, seeing who watched past stories, and reading messages without being seen.

The app also allows users to add dual accounts and receive activity notifications on Instagram. Users can easily monitor changes in their follower and following numbers and see who has blocked or muted them. Moreover, they can view their profile photos, stories, and posts in HD quality and download them if they want.

It is important to note that the app only saves cookies from the user's browser, and none of their data is exported from their device. However, some calculations may be incorrect for new accounts or those with a large number of followers due to Instagram restrictions. Also, some features require a premium account.

Overall, Unfollowers Tracker is a useful tool for Instagram users who want to manage their followers and stay up-to-date with their account activity.