onemaker.io

Find the BPM and key of any song

Tempo and musical key in seconds. Free, no signup.

How it works

a few seconds

  1. Drop your song

    Any of the formats listed, up to 200 MB. It goes straight to storage — never through our web server.

  2. The AI listens

    On our own machines: a minute from the middle of the song is enough for the tempo and the key. A video works too — we take its audio.

  3. Read it, or make a video

    BPM with the likely alternatives, the key with its confidence. Then pick a template — the beat lines up.

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Questions

Is it really free?
Yes — no signup, up to 20 songs an hour. The hourly count and the 200 MB limit exist to stop abuse, not to sell you a plan.
Why two possible tempos?
A beat can be counted at half or double speed — 80 and 160 are the same song. We show the one the AI is surest of and the alternative beside it.
What if no key is found?
Drums, speech and noisy recordings have no clear tonal centre. You still get the tempo; the key card says so honestly.
What happens to my song?
Your upload is deleted the moment the analysis finishes. Nothing is kept — the answer is on this page only.
BPM & Key Detector — free AI, no signup · Onemaker