A follower count can tell you that an audience got smaller, but not which accounts disappeared. It also cannot tell you, on its own, which people you follow who have not followed you back. Those are related questions, but they need different kinds of evidence: one requires an earlier record, while the other can be checked against a current list.
Unfollowers Track is a web tool built around those two comparisons. You enter a public Instagram username, without supplying an Instagram password. The service says it reads publicly available follower information rather than logging in to the account. That makes it a way to inspect visible account data, not a connection to Instagram that watches activity continuously.
Two questions, two kinds of comparison
The tool's headline task is finding accounts that stopped following a profile. For that, it compares follower lists captured at different times. Its other task is showing who does not follow back: the tool compares the account's followers with the accounts it follows. According to the site, that second result can be available from a single scan, because it depends on the current lists rather than a historical record.
This distinction matters if you arrive expecting a list of everyone who has ever unfollowed you. A scan cannot establish that history from nowhere. The first scan is the baseline. Later scans can be compared with it, and accounts missing from a subsequent list can be shown as unfollowers. In practice, changes are found when you run another scan, not at the moment someone taps unfollow.
The site also describes results such as follower changes and engagement information. Those are secondary to the core comparison, and the amount available depends on the account data the service can read and the access level. The free plan has a paid upgrade; the site says paid access unlocks complete lists, tracking for multiple accounts, and data exports. It does not make the basic time requirement go away: a history needs an earlier scan to compare against.
What using it involves
The workflow starts with a username, not an Instagram login. You submit a public handle for a scan, review the available results, and run later scans if you want to see changes over time. The landing page says you can preview results without creating an account. A Unfollowers Track account is needed to save scan history or subscribe, so a reader who wants a record should expect to do more than a one-time lookup.
There is no password field described, and the service says scans use public information. That is a meaningful boundary: the tool is not claiming to enter your account or change anything on your profile. It also means the profile needs to be public for its lists to be readable. Private accounts cannot be analyzed as they stand, according to the site.
The product runs on the web. The landing page also mentions a separate native app called Lurke, but that is not a reason to treat Unfollowers Track itself as an iOS or Android app. If you want a browser-based check of a public profile, the web workflow is the relevant one.
The limits behind the promise
The biggest limitation is historical. If you start scanning today, you cannot use the first scan to reconstruct who unfollowed you last week or last year. You can see accounts that do not follow back from the current comparison, but unfollow detection starts only after a baseline exists and a later scan provides something to compare. People who want continuous alerts should not assume that this scan-based process is a live monitor.
The public-data requirement narrows the audience too. A private profile is outside the tool's stated reach unless it is made public for scanning. And because the tool relies on Instagram lists being publicly visible, it is best understood as a reader for accessible account data, not a complete record of all activity or a way around privacy settings.
That makes the product most useful for someone managing a public Instagram profile who wants to check reciprocity now and build a record of follower changes from this point forward. It is a poor fit for someone with a private account, someone seeking a retroactive unfollower list, or anyone who expects automatic monitoring without running later scans.
See who unfollowed you on Instagram, no password needed