Use APKPure App
Get Instagram Unreleased old version APK for Android
Find out people who don't follow you back , who you don't follow back etc
This app analyses your instagram account and helps you find people who don't follow you back , who you don't follow back , mutual follower , recent unfollower . You can also directly view your friends profile on instagram by tapping on any of your friend
More features coming up on next version.
Disclaimer: This app is by no means affiliated to Instagram™.