Who doesn't follow you back
Choose the two list files from your Instagram data export. This page works out who you follow that doesn't follow you back.
followers_1.json and following.json — plus followers_2.json, followers_3.json and so on if your export has them.
Don't have the export yet? Instagram → Accounts Centre → Your information and permissions → Download your information. Choose JSON, and "Followers and following" is all you need.