Key on the circle
Key and mode measured from audio, shown on the circle of fifths.
Your taste has a key. Not a genre.
Pivot measures the key, tempo and chord moves of the songs you return to, then finds them in other genres.
ReadsApple MusicListenBrainzSpotify data files
Measured withBeat This!Basic PitchCore ML
All in one
Everything it does. Nothing it guesses.
Pivot listens to short official previews on your Mac, measures the music, and builds one mix a day that shares it.
Tempo and meter
Beats tracked on this Mac with Beat This!. Pulses at the real BPM.
Chord moves
Chord rhythm of each preview. Kept out of matching until validated.
One mix a day
Picks that share your keys and tempos, mostly from other genres.
Says why
Every pick names what it shares and the song of yours it echoes.
Your listening
Apple Music, a Spotify data download or ListenBrainz. No Spotify sign-in.
Motion Sickness · Phoebe Bridgers
keyDb maj · confidence 0.99
tempo107 BPM
chordsIV I vi I V IV · unvalidated
The app
A quiet library. Moving with the music.
Click any song and the panel plays back what Pivot measured: the key on the circle of fifths, the beat at its tempo, the chord rhythm of the preview.
63%of the sample mix sits outside the listener’s top genres
764chart songs measured to build the pool
17 of 20sample songs confident enough to count
Profile
You keep coming back to E major and up-tempo songs.
Keys plotted on the circle of fifths, tempo bands, mode and meter. Low-confidence songs are counted as unknown, not guessed.
No guessed theory
Measured, then checked.
We score the analyzer against expert-labelled audio and publish the numbers next to the best published results.
| Task · set | Pivot, on this Mac | Best published |
|---|---|---|
| Key · GiantSteps Key n = 120, 2-min clips | 73.1 weighted · 66.7 exact | 74.6 weighted · 67.9 exact (Korzeniowski & Widmer 2018) |
| Tempo · GiantSteps Tempo n = 118, 2-min clips | 79.7 Acc1 · 90.7 Acc2 | 73.0 Acc1 · 89.3 Acc2 (Schreiber & Müller 2018) |
| Same sets, 30-s centre clips what the app hears | key 68.3 weighted · tempo 81.4 Acc1 | |
| Key and tempo · GuitarSet n = 180, 30-s clips, 5 genres | key 82.2 exact · tempo 97.8 Acc1 |
Scores before any confidence gate. GuitarSet was used to choose a few constants, so it is not held out. Chord moves stay out of matching until a chord set validates them.
Audio, not guessesTheory comes only from audio models. Language models never name a key, chord or tempo.
Unknown is an answerBelow the confidence gate, Pivot says unknown and leaves the track out of the match.
Previews stay previews30-second official previews are analyzed on your Mac and deleted. No audio is stored or shared.