Groove Number

how swung is your track? groove number gives you the number.

drop in a song, record a clip, or open the live mic — groove number listens and tells you the one thing drum machines flatten and great players bend: the groove. 50% is dead straight. ~66% is full triplet swing. most music that feels good lives in between, around 54–62%. now you can see it.

and it's not just the number.

what it reads
• swing % — the hero. one honest number for how far off the straight grid the groove sits.
• bpm — dual-estimator with an octave guard, so 174 never gets called 87. nudge it ×2 / ÷2 or tap the tempo to lock it, and the swing recomputes against the corrected grid.
• key — chroma + krumhansl-schmuckler with a tuning estimate, shown with a confidence read and the runner-up key, so a close call never hides.

four ways to see it
• meter — the number, front and center: swing %, bpm, and key in one calm readout.
• swing grid — the signature view. every onset plotted against the straight 8th/16th grid, colored on-time, late, or rushing. you can see the pocket.
• spectrogram — mel-scaled heatmap, quiet to loud, low to high, with a frequency + dB scale.
• chromagram — the 12 pitch classes over time, tonic marked.

how it listens
• a file you drop in or pick (mp3, m4a, aac, wav, aiff, flac)
• a clip you record — it listens and stops on its own the moment the groove locks
• the live mic — a running bpm + swing read in the room, with a VU level meter and a live spectrogram

one more thing
• groove → midi — export the groove as a midi clip, swing baked into the note timing. drop it on a drum track in any daw and it plays your pocket.

built to be calm and honest
• fully on-device. your audio is analyzed right on your iphone, ipad, or mac. nothing is uploaded. nothing is stored on a server.
• no account. no sign-up. no ads. no tracking.
• strongest on four-on-the-floor and electronic music. live, acoustic, and rubato material is harder — so groove number always shows its confidence and hands you the ×2/÷2 and tap-tempo overrides. wrong calls stay visible, never silent.

one number for the feel of a track. plus everything you need to trust it.