InstaFollow by NoApostrophe3s LLC gives you all the details you want when it comes to who is following you on Instagram.
If you would like to know who is not following you back on Instagram, who stopped following you, or even track new followers, this is the app to help you do so. It should be noted that you need to use your Instagram username and login to use the app. Your username can be found above your Instagram photo, it doesn't contain .com or the @ symbol.
Features of the app include being able to track those who are no longer following you, track followers you don't follow, track those who don't currently follow you back, and track new followers.
The app gives you all the above features but the number of users you follow cannot be greater than 20,000. The app allows you to follow or unfollow a maximum set amount of 160 users per hour.
In this latest version of the app you can now make use of push notifications.
Your Dashboard is the starting point for all you'll want to do, giving you quick glance totals of all the information. When it comes to those you want to follow you can open their Instagram profile from within the app.
InstaFollow was updated on Feb. 19, 2013 and currently has 734 customer ratings with an average rating of four and a half out of five stars.
I found this app incredibly easy to use and the information was really interesting and useful. For those looking to follow/unfollow large numbers at a time this might not be ideal since there is a cap but the cap is so high that the average person will be well within the limit.
For: iPhone, iPod touch, and iPad with iOS 5.0 or later
Followers For Instagram - Followers and Unfollowers Tracker