● gesture-synth.com — the most features: four play modes, four waveforms, 120-second takes, free Beat Jam MIDI export, and the only Mouse Mode that plays with no webcam.
● gesture-synth.onrender.com — the only one naming a loop pedal, MIDI and harmony-aware visuals.
● gesturesynth.app — the simplest start: free, no install, 15-second clip, tracking stays on your device.
● Watch the export Playing is free almost everywhere, but keeping a video from gesture-synth.com costs $9.99 per recording.
Type gesture synth into a search box and you will get ten results that all look like the same thing: a free browser instrument that watches your hands through a webcam and turns finger positions into chords. Most people click the first one and assume that is the gesture synth.
It is not one product. It is at least ten separate sites on ten separate domains, and they differ in ways that matter the moment you try to keep what you played.
How this page was checked. Four of these sites were opened and read directly on 30 October 2026, and their rows are marked verified. The rest are summarised from each site’s own published description and marked own description, because a description is a claim rather than a test. Where a site does not publish something - pricing, in most cases - this page says so instead of assuming it is free.
All ten, side by side
| Site | What it says it does | Standout | Cost | Checked |
|---|
| gesture-synth.com | Two-hand tracking with a pinch to play. Melody, Easy Jam, Beat Jam and Sing & Play modes. | Mouse Mode plays with no camera, using the same engine. 15 or 120-second takes. | Free to play and record. $9.99 per video export to keep, sign-in required. Beat Jam MIDI export is free. | verified |
| gesture-synth.onrender.com | Play chords with your hands in front of a camera. | The only one naming a loop pedal, MIDI and harmony-aware visuals. | Not published | verified |
| gesturesynth.app | Webcam chord synth. Left hand plays main chords, right hand adds more. | Explicit privacy line: tracking stays on your device. Pick a Sound. | Free, 15-second clip, no install | verified |
| indecisiveeric.com/gesture-synth | Play chords using hand gestures and your webcam. Computer vision plus Web Audio. | Credited to a named creator, Eric Wei. | Free | verified |
| gesture-synth.org/play | Raise one to five fingers to play chords; hand movement shapes tone and energy. | States camera frames are processed locally and not uploaded. | Free, records short clips | own description |
| gesturesynth.org | Browser music game using webcam hand tracking. | Framed as a game. Shapes filter, volume and octave. | Not published | own description |
| gesture-synth.co | Two hands to play chords in the browser. | Controls voicing, loudness, tone and octave. | Free | own description |
| gesture-synth.net | Browser music from one-to-five finger gestures. | Emphasises recognising stable finger shapes. | Free | own description |
| gesturesynth.me | Turns a standard webcam into a responsive musical synth. | Two-handed play. | Not published | own description |
| gesturesynth.art | Browser instrument tracking hand gestures into live music. | No distinguishing feature published. | Free | own description |
| gesture-synth-weld.vercel.app | Camera access is required to play. | Publishes almost nothing beyond the camera requirement. | Not published | own description |
The one that does the most
gesture-synth.com is the most developed version we opened, and it is the only one with a published price.
- Four modes: Melody, Easy Jam (four chords), Beat Jam (a guided four-bar performance) and Sing & Play, which can use a microphone.
- Mouse Mode. No camera at all. Horizontal pointer movement controls pitch, vertical controls brightness, pressing starts and stops a note - and the site states it uses the same scales, waveforms and synthesis engine as the camera experience.
- Scales and voices: pentatonic, major and minor with an adjustable root; sine, triangle, sawtooth and square.
- Recording: 15 or 120-second takes with preview.
- Export: Beat Jam MIDI note export is free. Keeping a video export costs US$9.99 per recording and requires signing in with Google or email. There is no subscription.
Why the Mouse Mode matters more than it sounds
Every other version on this list requires a working webcam and permission to use it. That rules the whole category out on a locked-down work laptop, on a desktop with no camera, in a room where you do not want to be filmed, and for anyone who simply will not grant camera access to an unfamiliar site. Mouse Mode is the only route into this instrument that does not involve any of that.
The one for actually making something
gesture-synth.onrender.com is the only version naming a loop pedal and MIDI. That combination is the difference between a toy and an instrument: a loop pedal lets you build a part over itself, and MIDI means the notes leave the browser and go into whatever you actually produce in.
The honest caveat is that its page publishes almost nothing else - no pricing, no controls, no detail on how the MIDI works. You find out by opening it.
The one with a name attached
indecisiveeric.com/gesture-synth is credited to Eric Wei and is a free browser instrument using computer vision for hand tracking and Web Audio for sound. It does not claim to be the original, and it does not mention the other versions.
We are not going to tell you which of these came first, because none of them says so and we have not seen evidence either way. What is worth knowing is that this is the only one that puts a person’s name to it.
The simplest one
gesturesynth.app splits the job across your hands - left hand plays the main chords, right hand adds more - lets you pick a sound, and records a 15-second clip. It is free, needs no install, and states that tracking stays on your device.
If you have never used one of these and want to know within thirty seconds whether you enjoy it, this is the least cluttered starting point.
Which one should you open?
| If you... | Open | Why |
|---|
| Just want to try it | gesturesynth.app | Free, no install, 15 seconds, nothing to learn |
| Have no webcam, or will not grant access | gesture-synth.com | Mouse Mode, same synthesis engine |
| Want to build a layered part | gesture-synth.onrender.com | The only published loop pedal |
| Want the notes in your DAW | gesture-synth.onrender.com or gesture-synth.com | MIDI, and free Beat Jam MIDI export respectively |
| Need longer than 15 seconds | gesture-synth.com | 120-second takes; most others cap at 15 |
| Care who made it | indecisiveeric.com/gesture-synth | The only one crediting a named creator |
| Want to keep a shareable video | gesture-synth.com | But budget $9.99 per export |
Before you grant camera access to any of them
All but one of these need your webcam, and most are run by people you cannot identify from the page. Two of them publish an explicit claim that frames are processed locally and not uploaded - gesturesynth.app and gesture-synth.org/play. The rest say nothing about it either way.
- Absence of a privacy claim is not evidence of a problem, but it is not reassurance either.
- Browser camera permission is per-site and revocable. Grant it, play, then revoke it in your browser’s site settings rather than leaving it on.
- None of these needs an account to play. If one asks you to sign in before you have heard a sound, close it.
- On gesture-synth.com, sign-in is required only at the point of paying to export - not to play or record.
Frequently asked questions
Which Gesture Synth is the best one?
For features, gesture-synth.com - it has four play modes, four waveforms, 120-second recordings, free Beat Jam MIDI export and a Mouse Mode that works with no camera. For building a layered performance, gesture-synth.onrender.com is the only one naming a loop pedal and MIDI. To simply try the idea, gesturesynth.app is free with a 15-second clip and no install.
Is Gesture Synth free?
Mostly, but not entirely. Playing and recording are free on every version we checked. On gesture-synth.com, keeping a video export costs US$9.99 per recording and requires signing in, though its Beat Jam MIDI note export is free. Several of the other sites do not publish pricing at all.
Can I use a Gesture Synth without a webcam?
Yes, on one of them. gesture-synth.com has a Mouse Mode where horizontal pointer movement controls pitch and vertical controls brightness, and the site states it uses the same scales, waveforms and synthesis engine as the camera version. Every other site we looked at requires camera access.
Why are there so many Gesture Synth websites?
The concept - webcam hand tracking driving a browser synth - is straightforward to build with computer-vision hand tracking and the Web Audio API, and the name is not held by any one of them. The result is at least ten sites across .app, .org, .com, .net, .me, .co, .art and two hosting subdomains, all describing broadly the same instrument with different features behind it.
Who created Gesture Synth?
No single answer. The version at indecisiveeric.com/gesture-synth is credited to Eric Wei and is the only one on this list naming a creator. None of the sites claims to be the original, so we are not going to assert an origin we cannot evidence.
How long a clip can I record?
Most cap at 15 seconds. gesture-synth.com offers 15 or 120-second takes, which is the longest published figure we found.
Is it safe to give these sites my camera?
Two sites - gesturesynth.app and gesture-synth.org/play - publish an explicit claim that frames are processed on your device and not uploaded. The others say nothing either way. Camera permission in a browser is per-site and can be revoked in site settings once you have finished playing, which is the sensible default for any of them.
More on playing it
Sources
The four sources above were opened and read on 30 October 2026. The remaining sites in the table are summarised from their own published descriptions and are marked as such in the Checked column. Features change without notice on sites like these, so treat anything time-sensitive as a snapshot of that date.