igtrackr Unfollowers Tracker is a browser based tool that analyzes an Instagram data export to identify accounts that do not follow the user back, accounts that the user follows but that are not following them, and followers the user has not followed. It can also identify unfollowers by comparing follower lists from two exports taken at different times. To use the tool, a user requests a download of their followers and following information from Instagram’s Accounts Center in JSON format. They then upload the resulting ZIP file, or the followers_1.json and following.json files contained in it. The tool reads the files in the browser and states that they are not uploaded to a server. No Instagram login or password is required. The tool is intended for accounts the user owns, since Instagram’s data export provides information for those accounts. It does not retrieve follower lists by entering a username or access another person’s private account. The site also offers related Instagram tools, including a public account recent followers tool, follower tracking, follower list export, and profile and engagement analysis tools.