WhohearsFree Last.fm tool
Last.fm Compatibility Checker
Two Last.fm usernames in; a level from Super to Low and the artists you share out. Any public profiles, no sign-up — and shared artists are weighted by rarity, so The Beatles in common counts less than an artist with twenty thousand listeners.
Usernames or last.fm/user/… links. Both profiles must be public. Nothing is stored.
How compatibility is computed
80% rarity-weighted artist overlap, 20% track overlap, over both public top-1,000 lists. On 685 real pairs it lands within one rung of Last.fm's own verdict 73.8% of the time.
Last.fm compatibility levels
| Level | Overlap score |
|---|---|
| Super | 60% and up |
| Very High | 40 – 59% |
| High | 25 – 39% |
| Medium | 10 – 24% |
| Low | 1 – 9% |
| None | 0% |
Then hear what they're hearing
A Dex is what that sounds like: the tracks your Last.fm friends play that you haven't heard, as a collection you fill in by listening.
Build your Dex — freeCompatibility questions
80% rarity-weighted shared artists, 20% shared tracks, from both users' public top artists and tracks.
Super 60%+, Very High 40–59%, High 25–39%, Medium 10–24%, Low 1–9% — Last.fm's own ladder.
Last.fm sees play counts; we only see which artists are present. On 685 real pairs it lands within one rung 73.8% of the time.