Drop a track to read its tempo and its key, with the Camelot code DJs mix by. The analysis runs on your own device: the file is never uploaded, so unreleased mixes stay private.
Tempo: the tool marks where the sound suddenly gets brighter or louder — the onsets of drums and notes — and looks for the time gap that repeats most strongly across one minute of the track, starting a quarter of the way in, past most intros. Every tempo has a half-time and a double-time reading that are equally true, so both are shown under the main figure; pick the one you count along to.
Key: the energy of the track is folded into the twelve pitch classes and compared with the Krumhansl–Kessler key profiles, the listener-tested weights of each note in every major and minor key. The best match is the key; the runner-up is shown because the relative minor or major, or the key a fifth away, is often close behind.
No key or tempo detector is right on every track, this one included: songs that change key, rubato, songs without drums and heavily distorted mixes are the hard cases. When the tool cannot find a steady beat it says so instead of guessing. Check a doubtful tempo with the BPM Tap Counter.
Turkish makam music does not live in major and minor keys, so a Western key reading says little about it. For makam, use the Makam Tuner and the Turkish Makam pages.
Is my file uploaded?
No. The browser decodes and analyses it on your device; nothing is sent to a server. You can
disconnect from the internet after the page loads and it still works.
Why does it say 70 BPM when the song feels like 140?
Half-time and double-time are both valid readings of the same beat. The tool picks the one
nearer the most common tempos and lists the other right underneath; use whichever matches
how you count the track.
What is the Camelot code?
A number from 1 to 12 with A for minor or B for major. Neighbouring numbers and the same
number with the other letter mix smoothly. The
Camelot Wheel shows the whole map.
Which files work?
Whatever your browser can play: MP3, WAV, M4A/AAC and OGG almost everywhere, FLAC in most
browsers. Long files are fine; the key reads up to the first four minutes.
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