Instagram already shows you your followers that you aren't following, but it doesn't do the opposite.
I created this site to show you your Insta Ghosts: accounts you're following that aren't your follower. The best part? It's completely anonymous.
This is the only website I've found that can prove it's 100% anonymous and safe for you (the site's code for those who want to verify). I wrote this website from scratch, so there's no 3rd parties used here that could steal your information, nor any hacky method of accessing Instagram for account data.
This means that by using instaghosts.com, Instagram won't ban you, I won't get sued, and I can't see that you were using instaghosts.com. Most importantly though, this means no hacker or myself can see your IG or your zip file during your entire time here. As soon as you reload/close the tab, the zip file is gone and you have to reupload it if you want to use it again. Sorry for the inconvenience, but at least you're completely safe the entire time you're here.
These steps will guide you through obtaining your Instagram data in a zip file and uploading it here. This process is designed to be easy and anonymous—only you will have access to your data. If you change your mind at any point, don’t worry—you don’t have to undo anything.
Once Instagram gets your zip file ready, follow these steps on an iPhone to download your IG zip file and upload it here. If you don't have an iPhone or they don't line up perfectly, the steps should be very similar and easy to match on your device.