Hold up fingers, tilt a wrist, and chords come out of the speakers. This Gesture Synth page is a free browser instrument on 67 Speed Games — same idea people look up as gesturesynth or a hand gesture synth, rebuilt so you can start in one click.
Tip: Allow the camera, click to enable audio, then step back until both hands are in frame. Bright, even light helps more than a fancy webcam.
A gesture synth is not a toy that beeps when you wave. It is a small chord instrument that reads your hands. Left hand picks the scale degree. Right hand picks the voicing, the octave, the filter, and how loud you are. If you have used a finger synth on a phone — tap a pad, get a triad — this is that idea, except the “pads” are your fingers in the air.
People type gesturesynth as one word because that is how the demos get shared. The useful search is still hand gesture synth: camera on, both hands visible, sound in the tab. No account. Nothing to install. If the browser can see you and play audio, you are in.
We built this page because 67 Speed Games already lives on a webcam. The speed test counts arm reps. Battle puts you on a live call. A gesture synth fits the same habit: stand up, give the camera a clean view, and let the page respond. The difference is musical instead of competitive. You are not racing a stranger. You are holding a chord until it feels right, then changing one finger.
The tracker is MediaPipe’s hand model. It does not need a special glove. It needs light, distance, and a little patience for the first two seconds. After that, the finger synth mapping is fixed. Learn it once and it stays the same every visit.
One raised finger is I. Two is II. Three, four, five walk up the scale. Index plus pinky, no middle or ring, is VI. Add the thumb to that shape and you get VII. Tilt the palm inward for major, outward for minor. That is the whole left-hand language. It is closer to a church-mode cheat sheet than to a piano keyboard, which is the point: you can hold a progression without looking down.
Raised fingers on the right change the chord quality: root position, first inversion, a seventh, or a dominant / diminished seventh depending on major or minor. Thumb in raises the octave. Thumb out drops it. Tilt sweeps a low-pass filter. Height is volume — higher hand, louder chord. If the right hand leaves the frame, the sound ducks. That is deliberate. It keeps a missed detection from sitting on a stuck note.
Pick a key in the side panel before you start a song. Warm, Bright, and Arcade are oscillator tones, not sampled concert pianos. They cut through a laptop speaker. If you want felt hammers, use a piano online later. This page is for hearing the harmony move when a finger moves.
The mapping did not start here. Indecisive Eric (Eric Wei) published a webcam instrument that spread as Gesture Synth Weld. The live demo most people still pass around sits on Vercel as a Vercel app: gesture-synth-weld.vercel.app. If you searched gesture synth vercel, gesture synth weld vercel, or the longer gesture synth weld vercel app, that is the tab you already opened.
The same host string shows up in screenshots as synth weld vercel app or just weld vercel app. Those are not different products. They are how a URL gets shortened in a group chat. The open repo is gesture-synth-weld (MIT). Our page keeps the two-hand chord rules and puts them in the 67 Speed Games shell. We are not pretending to be that site. If you want the original camera look and the later Tone.js instruments, go to the Vercel demo or the GitHub build.
Another name that lands on the same habit is SoundGo / Sound Go. People look for a soundgo vercel or soundgo vercel app when they want a browser toy that makes pitch from motion. Some of those experiments are theremins. Some are drum pads. This page stays on chords. If Sound Go got you here, you are in the right neighborhood: camera, hands, sound, no installer.
A piano is still the honest way to learn voicings. A good piano online or online piano lets you see every note. Use one when you need to check whether that “VII” is actually the leading-tone triad you meant. The gesture synth will not replace that. It replaces the part where you hunt for a USB keyboard just to hear I–V–vi–IV.
An omnichord is strum plus buttons. A web harmonium is drone plus a right-hand melody. Both sit next to a finger synth in the same drawer: harmony first, technique second. If you miss the omnichord’s touch plate, hold a chord here and sweep the right-hand filter. It is not the same object. It scratches the same itch.
Keep a piano online tab for spelling. This hand gesture synth shows a chord name, not a staff. When a voicing sounds thin, open the online piano, play the same triad, and decide if you want the seventh back in the air.
Choicer Voicer shows up in the same searches as voice-leading helpers and chord toys. We are not that plugin. If you arrived from a Choicer Voicer result, treat this as the performance side: pick a voicing with fingers, listen, then go back to a voicing tool if you are arranging on paper.
The first song most people try on a new chord toy is Creep. The Creep Radiohead loop is four holds: G, B, C, Cm. In this key that is I, III, IV, then iv. That is why Creep chords teach the left-hand tilt so fast — the last change is the same degree, major to minor. You feel the room drop without touching a black key.
I will not paste Creep lyrics or the full Creep Radiohead lyrics here. Those lines belong to the writers. You already know the vocal. What this page is for is the harmony under it. Set the key to G. Hold I, then III, then IV, then tilt out for iv. Keep the right hand on a simple root-position shape until the left hand is clean. After that, add a seventh on the B if you want it to sting more.
If you came from a lyrics site, stay for one pass through the progression, then go back to the words. The finger synth is a practice loop, not a karaoke machine. Same advice for any four-chord song: learn the left hand first. The right hand is seasoning.
A practical pass takes two minutes. Stand far enough that elbows are visible. Drop your shoulders. Raise the left hand first and cycle I–V without audio if you need to. Then click enable audio and add the right hand at chest height so the volume sits in the middle of the meter. If the chord name flickers, you are too close or a finger is half bent. That is almost always the fix — not a refresh, not a different browser.
Eric’s write-ups under Indecisive Eric are worth a look if you want the original camera aesthetic and the later sampled instruments. This page stays smaller on purpose: one key menu, three tones, the chord under your hands. When you are done, the tab closes. Nothing is saved unless you record it yourself with the system recorder.
Same family, not the same tab. Gesture Synth Weld is the open project and the gesture-synth-weld.vercel.app demo. We kept the two-hand chord language and hosted a 67 Speed Games build. Use the Vercel app if you want their later instruments and recording. Use this page if you already play our other webcam games and want chords in the same place.
No. A piano helps you study, but the hand gesture synth only needs a camera and speakers. Pair it with a piano online when you want to see the notes. Leave the hardware in the case.
VI and VII are special shapes, not “six fingers.” Index and pinky only for VI. Add the thumb for VII. Middle and ring must stay down. If the model still flips, step back and uncurl those two fingers all the way.
Yes. Use the Creep chords above. Skip pasting Creep Radiohead lyrics into the chat — sing them if you want, and keep the page on the G–B–C–Cm loop.