Feel Good Metronome Open the app
Feel Good Metronome

Never made a stank face at a metronome before?

The first metronome that gives you stank face.

The groove sits on a dial, not in a menu. Five feels on the front, swing by the percent, and the click leans with you.

Open the app Join the waitlist

Free during the preview. No account, no tracking, works offline.

Try it right here

The same beat. Two completely different feels.

Press play, then drag the swing slider from 50% to 66.7%. Nothing else changes — same tempo, same click, same bar. Watch the eighth-note pair re-space, and listen to the second note slide late.

104 BPM · quarter note Swung 58 : 42
The eighth-note pair. The first note is long, the second lands late by the swing percentage.
Beat 1Off · 58.0%Beat 2

50 percent is dead straight. 66.7 percent is a true triplet. 72 percent is HARD, past a triplet.

This little demo is a taste. The app adds the five feels, a drift-free scheduler, 8th and 16th subdivision, meters, count-in, tap tempo, six memory slots, four click sounds and five vintage drum-machine kits.

Groove Match

Drop in audio. Get the feel back as numbers.

Pick a file — your own rough mix, a voice memo off the board, a song you bought. Feel Good Metronome measures it and hands you four things in a few seconds. One tap applies them to the click.

Tempo

The BPM, with the half-and-double candidate reported too, so an 88 never gets mistaken for a 176.

Swing %

In the same convention the swing knob uses. 50% straight, 66.7% a true triplet, 75% a hard shuffle.

Pocket

Milliseconds ahead of or behind the grid — whether the take pushes or lays back. The thing everybody feels and nobody can name.

16-slot groove template

Where every sixteenth actually lands and how hard it hits, plus a confidence score so you know how much to trust the read.

Your audio never leaves your phone.

The file is decoded in the browser, downmixed to mono and measured inside a Web Worker on your own device. The buffer is discarded when the read is done. Nothing is uploaded, nothing is stored, and there is no server to upload it to.

Researched presets

The machines, with their homework shown.

Every swing number here came out of a manual, a designer on record, or a peer-reviewed measurement — and each one carries its source. Tap any preset to see where the number comes from.

Machines · MPC / LM-1

MPC · 50% · straight 50.0
Both subdivisions equal; the manual's zero-swing anchor.MPC60 / MPC3000 manuals, and Roger Linn in Attack Magazine.Documented
MPC · 54% 54.0
Linn's lightest useful swing — "loosen up the feel without it sounding like swing".Roger Linn, Attack Magazine interview.Documented
MPC · 58% 58.0
In Linn's 48-ppq enumeration; commonly cited as the boom-bap setting.Linn's enumeration, via Attack Magazine.Widely reported
MPC · 62% 62.0
Linn: "a 90 BPM swing groove will feel looser at 62% than at a perfect swing setting of 66%".Roger Linn, Attack Magazine interview.Documented
MPC · 66% · triplet 66.7
The MPC manuals call it "technically perfect swing" — the first note takes two thirds of the pair.MPC60 / MPC3000 manuals, and Roger Linn.Documented
MPC · 70% · LM-1 step 70.0
Linn's 48-ppq enumeration lands on 70%, not 71% — the two values have different origins and we keep them apart.Linn's enumeration, preserved on the Renoise forum.Widely reported
MPC · 75% · hard 75.0
The maximum: the first note runs three times the length of the second. The manuals call it "very exaggerated".MPC60 / MPC3000 manuals.Documented

Machines · Logic Pro Q-Swing

Logic 16B · 54% 54.0
Logic's gentlest Q-Swing step on sixteenths.Apple Logic Pro user guide, confirmed in Sound on Sound.Documented
Logic 16C · 58% 58.0
Mild Q-Swing on sixteenths — almost exactly the LM-1's own 58.Apple Logic Pro user guide.Documented
Logic 16D · 62% 62.0
Mid Q-Swing on sixteenths.Apple Logic Pro user guide.Documented
Logic 16E · 66% 66.0
Logic's triplet feel. The user guide names it directly: "a triplet feel is the E setting".Apple Logic Pro user guide.Documented
Logic 16F · 71% 71.0
Logic's hardest Q-Swing step.Apple Logic Pro user guide, confirmed in Sound on Sound.Documented

Machines · Ableton Swing folder

Ableton Swing 16-55 59.2
Ableton's Swing folder runs a 0–100 scale where 0 is straight and 100 is a triplet — not the Linn scale. Converted: 55/100 lands at 59.2% here.Ableton Swing folder preset; scale convention per forum.ableton.com.Documented
Ableton Swing 16-75 62.5
Heavy sixteenth swing from the same folder.Ableton Swing folder preset.Documented
Ableton Swing 16-99 66.7
Near-maximum — essentially a true triplet feel.Ableton Swing folder preset.Documented

Machines · Roland TR-909

TR-909 · straight 50.0
Shuffle position 1 — even sixteenths.TR-909 shuffle button, measured on KVR Audio.Documented
TR-909 · triplet 66.7
The middle shuffle positions give the triplet feel. Sources disagree on the exact step number, so only the endpoints and the middle ship.KVR measurement at 96-ppq resolution.Widely reported
TR-909 · hard 75.0
Top shuffle position. (The original TR-808 has no shuffle control at all, so there is no 808 preset — that would be made up.)TR-909 shuffle button.Documented

Jazz ride · measured

Jazz ride · ballad 78.0
Around 100–145 BPM the ride's swing ratio climbs toward 3.5 : 1.Friberg & Sundström, Music Perception 19(3), 2002.Documented
Jazz ride · medium 69.0
Around 160–210 BPM the group average sits near 2.24 : 1. Swing ratio tracks tempo — it is not one number.Friberg & Sundström 2002; Honing & de Haas 2008.Documented
Jazz ride · bebop 52.0
At 240–300 BPM the short note hits a perceptual floor and the ratio collapses back toward even.Friberg & Sundström 2002.Documented

Shuffles & methods · named feels

Shuffle · 60% 60.0
A triplet-based half-time shuffle. No reputable source commits a number to it, so it ships with a soft 60% default and the knob is yours.Associated with Larrie Londin and Eddie Bayers. Not a committed numeric value.Widely reported
Half-time shuffle 64.0
Snare on 3 only, lead hand playing triplets with ghost notes. One academic measurement of the Rosanna take exists, but its published ratio could not be confirmed, so this ships as a style with a soft default.Rosanna / Purdie style; Räsänen et al., arXiv 2411.06892 (2024) as the reference point.Widely reported
Unquantized feel 55.5
A straight clock with deliberate human drift — the "quantize off" method. Groove Match captures a specific one from your own audio instead of guessing.MPC quantize-off method, via Questlove and Attack Magazine. No artist is credited in a preset title — that is a rights call, and the circulating "artist percentages" are folklore.Widely reported

Click sounds

Four clicks. Five kits.

Flip the front switch to CLICK and it is a metronome: wood, clave, rim or beep, a brighter accent on 1, the subdivision riding lighter underneath. Every click is built from scratch by the app each time it plays — no samples, attack on sample zero, so changing the sound never costs you a millisecond of timing. Flip it to BEAT and the click is a sequenced vintage drum-machine groove, with five kits on the KIT knob.

WoodClassic woodblock click
ClaveShort, dry pulse
RimSide-stick tick
BeepVintage metronome beep

Five feels

Pick the feel. Skip the subdivision maths.

Five keys on the front, in order of swing, light cap to dark. Each one is a groove written in its own subdivision — sixteenths, eighths or true triplets — and the swing knob is free to move from wherever it starts. Four more feels live in the drawer.

Straight4/4 · 50 : 50

Even sixteenths, no lean. Pop, rock, and straight-ahead country.

Swung4/4 · 58 : 42

Boom-bap with the sixteenths swung lightly. Where the machine starts.

Shuffle4/4 · 62 : 38

The eighth-note shuffle. Long-short eighths you can lean back on.

Triplet4/4 · 67 : 33

A true 2:1 triplet feel. Classic blues and jump.

Hard4/4 · 72 : 28

Past a triplet — the off-beat sits late. Dirty, dragged, bluesy.

Half-time4/4 · drawer

The backbeat lands on 3, so the whole bar feels twice as slow and wide.

Cut-time2/2 · drawer

Two big beats a bar, counted in halves. Fast tunes that still need room to breathe.

Train beat4/4 · 16ths · drawer

Straight sixteenths chattering under accented quarters — the boom-chick freight-train groove.

6/8 ballad6/8 · drawer

Two big rolling beats, each split in three. Ballads and slow waltz-shuffles.

Questions

The things people actually ask.

Can I use songs I bought on iTunes?

Yes, if you own the file. iTunes Store purchases have been DRM-free since 2009, so Groove Match can open the .m4a and read its tempo and feel. Measuring your own file on your own device — numbers out, nothing copied, nothing kept — is what every DAW's groove-extract does.

No for streaming downloads. Offline files from Apple Music, Spotify and the like are DRM-protected. A browser cannot decode them and Feel Good Metronome does not try. Use a purchased file, your own recording, or a voice memo.

On an iPhone the import comes from the Files app or Voice Memos — a web app cannot reach the Apple Music library. This is our informed reading, not legal advice.

What do you collect about me?

Nothing. The app has no account, no login, no analytics, no telemetry, no cookies, no advertising and no third-party SDKs. There is no server for it to phone home to.

Your presets, setlist and preferences live in your browser's local storage, on your device. Clearing your browser data clears them. The only thing this website stores is a waitlist email address, if you choose to give us one.

Is the timing actually solid?

Yes, and it is measured, not asserted. Clicks are scheduled against the audio clock through a lookahead scheduler, never by a timer that fires the sound itself. The build's own test suite renders the audio offline and checks real onsets against the plan: zero drift at 120 BPM across 64 bars, and the exact long-short ratio at every detent.

Does it work offline?

Yes. It is a Progressive Web App — add it to your home screen and it runs with no connection, which is the only state that matters in a basement venue or at 36,000 feet.

Why does swing get a percent instead of a preset?

Because the pocket lives between the presets. Half a percent is the difference between a shuffle that sits down and one that drags. The named feels are there when you want to grab one and go; the knob is there when you need to find the exact place a song actually sits.

What does it cost?

It is free during the preview.

Who made it?

Keaton Simons — a working musician and producer — through One M Productions, built for the people he plays with. It is a session player's tool, not a lab experiment.

Waitlist

It’s open — install it

One email, once, when it is open to everyone. That is the whole plan.

What we store: your email address and the time you sent it. That is everything. It is used for one thing — to tell you when Feel Good Metronome opens — and it is never sold, shared or passed to any other company. There are no trackers, no analytics and no third-party scripts anywhere on this page. To stop abuse the server briefly holds a one-way hash of your IP address; it contains no address, and it is deleted within the minute.