Cleaner for Instagram is the best app to mass unfollow Instagram users. You can also mass block Instagram followers mass delete Instagram posts and mass unlike Instagram photos or videos.

Here are all the app features:

* Mass unfollow
* Mass block and unblock
* Mass delete posts
* Mass download posts for backup
* Mass unlike posts
* Quick selection tools
* Advanced quick selection with Inactive and Ghost users detection
* Pending Actions Service (app continues to work in background)
* Whitelist Manager (avoid accidental unfollows or blocks)
* Support for filters multiple accounts quick relationship indicator
* Activity log with undo option
* Activity statistics
* Help Center with 24/7 support

Disclaimer: 'Cleaner for Instagram' is a third party companion app for Instagram and is not affiliated with Instagram/Facebook Inc.