AI-grade tempo detection in under 10 seconds. Works with MP3, WAV, FLAC, M4A and AIFF. Includes downbeat alignment and tempo stability score.
Up to 45 MB. We never store the file — analysis runs in-flight and the audio is discarded after.
Tempo, downbeat alignment and stability score appear in seconds.
One click and you also see key, Camelot, energy, mood, structure and stems — all free.
We don't just guess — we lock the downbeat and report tempo stability across the full track.
No accounts. No upload history. Audio is processed in-flight and discarded.
MP3, WAV, FLAC, AIFF, M4A — anything ffmpeg can decode.
BPM stands for beats per minute — the tempo of a song. A 120 BPM track has 120 beats every 60 seconds.
Yes — the tempo detector is 100% free, no signup, no credit card. We support the site with non-intrusive video ads between actions.
SignalKey's tempo detection is within ±0.5 BPM for 95% of modern productions. Live recordings with heavy rubato may swing more.
Not yet — but you can rip the audio with any free downloader and drop the file here.
MP3, WAV, FLAC, M4A and AIFF up to 45 MB.