Cadence-matched playlists from your own music — for running, cycling, or any steady-tempo workout. Analyzed on your device; nothing is uploaded, ever.
Point it at your music. Tempo is detected on your device by a neural beat tracker — nothing is uploaded, ever.
Tell it your cadence — say, 175 steps or 90 pedal strokes per minute.
Get an ordered playlist that locks to your cadence, with beat-matched transitions between songs.
Works with the files you already own.
A 90 BPM groove fits a 180 SPM run. BPM Companion knows, and labels it.
All analysis happens on your device. No account, no upload — no internet access at all.
Songs hand off on the downbeat, like a DJ.
One Rust engine on every platform. The Android app is out now; the iOS app is on its way.
Building a fitness app? The tempo engine is available as an SDK.
The quick first look gives every song a rough tempo within seconds, so you can start right away. The second stage listens carefully through the whole track and pins down every single beat — that's what precise matching and DJ-style transitions are built on, and it takes longer.
Because it really listens to the whole song, right on your phone — a few seconds per track. It's deliberately kept gentle so your phone stays cool and the battery lasts. It keeps working in the background even with the app closed, and each song only ever needs it once — the result is saved.
Streaming services don't let other apps touch the actual audio, and the analysis needs to hear the music. It's also a promise: the app never goes online at all, so your music and your data stay on your phone.
Common local audio: MP3, AAC/M4A, FLAC, OGG/Opus and WAV — including the WebM/Opus files that YouTube downloads are often saved as, under a misleading .mp3 name. Files with DRM on them cannot be read.
Any way you like: drag the outer ring, tap the center disc in the rhythm of your steps, fine-tune with the plus and minus buttons — or press and hold the disc and walk: after ten seconds the app has measured your pace by itself.
In that song there's one beat for every two steps — the rhythm still fits your stride exactly. The queue marks these songs, and you can turn off half- and double-time matching in settings.
Many songs open with a slow intro or trail off at the end — exactly the parts that would break your stride. By default the app skips them and starts where the music itself starts: a quiet intro can keep perfect time and still leave you waiting. Turn that off in settings if you'd rather always hear the whole song.
The quick estimate is sometimes off by exactly a factor of two — 85 instead of 170, because the same rhythm can be counted either way. The careful second stage settles it. Your playlists usually don't change: at half the count, the song fit your pace just the same.
Press play anyway — a metronome ticks at your pace. The moment you turn the dial to where songs do match, the music takes over.
The app is shaped by feedback — what clicks, what feels off, what's missing. A couple of sentences help more than you'd think.
or write to support@bpmcompanion.app