Life & fun · alternatives · 2026

SYNTHI-JS is a JavaScript-based emulation of the EMS Synthi A analog synthesizer. It recreates the modular synthesizer experience with 11 components including oscillators and filters, organized around a central… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier. A JavaScript emulator of the Synthi A synthesizer launched in 2016; newer entries below may have overtaken it.

1. 1
   The first websynth that's 100% mappable to a MIDI controller▲122

   Emulation of the Roland Juno-106 analog synth. Contribute to stevengoldberg/juno106 development by creating an account on GitHub.

   2015 · github.com · its alternatives →

2. 2
   8-bit Sounds – Studio2600 for the VCS (Atari 2600)▲78

   Studio2600 for the Atari VCS / Atari 2600 – Online demo powered by Javatari

   2018 · masswerk.at · its alternatives →

3. 3AS
   A singing synthesizer for the browser with automatic 3-part harmony▲208

   2024 · pbat.ch · its alternatives →

4. 4
   HTML5 Piano - with its own data URI synth▲64

   A synth piano synth that generates all of its audio files dynamically using JavaScript and data URIs. Choose from a variety of sounds styles and play with the looper, visual waveforms, and more.

   2012 · mrcoles.com · its alternatives →

5. 5
   io808▲122

   The classic drum machine synthesizer brought to the web.

   2016 · io808.com · its alternatives →

6. 6
   Tones.fm – Make synth music▲309

   Tones is a simple, open, collaborative music-making platform. All tones are created using the built-in synthesizer.

   2018 · tones.fm · its alternatives →

7. 7
   My x86 emulator written in JavaScript▲765

   Run KolibriOS, Linux or Windows 98 in your browser

   2013 · copy.sh · its alternatives →

8. 8
   I built a synthesizer based on 3D physicsfree tier, from $99/mo▲512

   I've been working on the Anukari 3D Physics Synthesizer for a little over two years now. It's one of the earliest virtual instruments to rely on the GPU for audio processing, which has been incredibly challenging and fun. In the end, predictably, the GUI for manipulating the 3D system actually ended up being a lot more work than the physics simulation. So far I am only selling it direct on my website, which seems to be working well. I hope to turn it into a sustainable business, and ideally I'd have enough revenue to hire folks to help with it. So far it's been 99% a solo project, with…

   2025 · anukari.com · its alternatives →

9. 9
   What if your synthesizer was powered by APL (or a dumb K clone)?▲92

   I built k-synth as an experiment to see if a minimalist, K-inspired array language could make sketching waveforms faster and more intuitive than traditional code. I’ve put together a web-based toolkit so you can try the syntax directly in the browser without having to touch a compiler: Live Toolkit: https://octetta.github.io/k-synth/ If you visit the page, here is a quick path to an audio payoff: - Click "patches" and choose dm-bell.ks. - Click "run"—the notebook area will update. Click the waveform to hear the result. - Click the "->0" button below the waveform to copy…

   Mar 2026 · octetta.github.io · its alternatives →

10. 10
    106.js▲5

    Javascript emu of the classic Roland Juno-106 synthesizer.

    2016 · juno-106.js.org · its alternatives →

11. 11JP
    JavaScript Program Synthesis▲139

    2021 · grgv.xyz · its alternatives →

12. 12
    Roland 808303.studio▲89

    TR-808 drum machine and TB-303 bass synthesizer emulator

    2020 · roland50.studio · its alternatives →

13. 13KS
    Karplus-Strong Guitar Synthesizer in JavaScript▲171

    2015 · amid.fish · its alternatives →

14. 14
    Jamboree▲102

    Multiplayer synthesizer

    Jul 2026 · jamboree.space · its alternatives →

15. 15
    Synthsational▲131

    Jam on a synth that makes you sound good, w/o musical talent

    2025 · synthsational.boondoggle.studio · its alternatives →

16. 16IB
    I Built a Synthesizer with WASM▲25

    2020 · timdaub.github.io · its alternatives →

17. 17
    Oscillator Bank / Spectral Synthesizer▲36

    C Pixels-based graphical audio synthesizer implemented as a WebSocket server - grz0zrg/fas

    2020 · github.com · its alternatives →

18. 18SF
    Synth.fm▲17

    2015 · synth.fm · its alternatives →

19. 19
    Typebeat: Keyboard-controlled music sequencer, sampler, and synth▲201

    Keyboard-controlled music sequencer, sampler, and synth - kofigumbs/typebeat

    2022 · github.com · its alternatives →

20. 20
    A realtime node-based audio synth based on LLVM▲78

    A powerful realtime node-based audio synthesizer. Contribute to monadgroup/axiom development by creating an account on GitHub.

    2018 · github.com · its alternatives →

21. 21
    WX ▲111

    An experimental synth for playable generative sound

    Jul 2026 · scrapbrainaudio.com · its alternatives →

22. 22
    Building musical synthesizers with SQL queries▲176

    If you already know what bytebeat is, you don't need an explanation. If not, check my project :) Here is how it looks: SELECT mono(output( arraySum(x -> 1 / 6 * running_envelope(30 * (1 + x / 6), time, 0.05 * x, 0.005, lfo(0, 0.25, sine_wave, time / 8), 0.1) * sine_wave(time * 80 * exp2(x / 3)), range(12)))) FROM table; To check how it sounds, find the examples in the repository https://github.com/ClickHouse/NoiSQL

    2023 · github.com · its alternatives →

23. 23TZ
    The ZynAddSubFX open source musical synthesizer▲53

    2018 · zynaddsubfx.sf.net · its alternatives →

24. 24
    Animoog▲71

    Moog Music's polyphonic synthesizer

    2014 · apps.apple.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →