Life & fun · alternatives · 2026

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. Polyphonic Web Audio Synthesizer launched in 2017; newer entries below may have overtaken it.

1. 1
   Draw.Audio – A musical sketchpad using the Web Audio API▲249

   Draw.Audio is a free online music maker. Draw notes on a grid and hear them play back instantly — a browser-based synthesizer, sequencer, and visual instrument.

   2024 · draw.audio · its alternatives →

2. 2
   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 →

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

   2024 · pbat.ch · its alternatives →

4. 4IB
   I built a WebMIDI sequencer to control my hardware synths▲43

   Hey HN, I’m an ex-Google engineer trying to get back into music production. I needed a way to sequence my hardware synths using AI contexts without constantly switching windows, so I built this. It runs entirely in the browser using WebMIDI. No login required. It connects to your local MIDI devices (if you're on Chrome/Edge) and lets you generate patterns. Tech stack: [React / WebMIDI API / etc]. Link: www.simplychris.ai/droplets Code is a bit messy, but it works. Feedback welcome.

   Dec 2025 · simplychris.ai · its alternatives →

5. 5
   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 →

6. 6
   Typebeat: Keyboard-controlled music sequencer, sampler, and synth▲201

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

   2022 · github.com · its alternatives →

7. 7PB
   Perfect Bluetooth MIDI for Windows▲105

   Hi HN, I'm Erwin. I built a small free open-source utility that bridges Bluetooth LE MIDI keyboards into the new Windows MIDI Services stack so any DAW or Web MIDI app can use them as if they were wired. I bought a Roland FP-90X piano partly because it had Bluetooth MIDI. On my Windows 11 PC, pairing succeeded, but my DAW couldn't see the keyboard, and notes I sent from the PC never made the piano sing. After a regrettable number of evenings, I'd separated this into three independent bugs stacked on top of each other. The first one is the famous one: Windows only natively exposes BLE-MIDI…

   May 2026 · its alternatives →

8. 8
   Virtual Piano Keyboard▲76

   Play and practice the piano online

   2022 · muted.io · its alternatives →

9. 9WA
   Web Audio Spring-Mass Synthesis▲77

   Hi, I'm the author of this little Web Audio toy which does physical modeling synthesis using a simple spring-mass system. My current area of research is in sparse, event-based encodings of musical audio (https://blog.cochlea.xyz/sparse-interpretable-audio-codec-pa...). I'm very interested in decomposing audio signals into a description of the "system" (e.g., room, instrument, vocal tract, etc.) and a sparse "control signal" which describes how and when energy is injected into that system. This toy was a great way to start learning about physical modeling synthesis, which seems…

   2025 · blog.cochlea.xyz · its alternatives →

10. 10AP
    A platform for remote piano lessons based on the Web MIDI API▲224

    I'm building a video conferencing app designed to facilitate better remote piano lessons. My hope is to solve a lot of the challenges piano tutors and new students deal with when taking lessons through Skype/Zoom. It leverages WebRTC's data transmission to send media, MIDI state, and (eventually) send sheet music files and other musical data. I'm surprised with how well the MVP has worked and would love to hear any feedback or suggestions!

    2024 · keyboardconnect.com · its alternatives →

11. 11R4
    RC-455 – A WebAudio Synthesizer▲35

    2015 · barakchamo.github.io · its alternatives →

12. 12
    TB-303 Synth, Drum Machine and Sequencer in Web Audio▲238

    Create acid techno, in your browser with Acid Machine 2.

    2016 · errozero.co.uk · its alternatives →

13. 13
    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 →

14. 14T1
    TR-101 – A drum synth/sequencer made with Vue and the web audio API▲105

    2017 · inverted3.gitlab.io · its alternatives →

15. 15
    Web Audio Studio – A Visual Debugger for Web Audio API Graphs▲64

    Hi HN, I’ve been working on a browser-based tool for exploring and debugging Web Audio API graphs. Web Audio Studio lets you write real Web Audio API code, run it, and see the runtime graph it produces as an interactive visual representation. Instead of mentally tracking connect() calls, you can inspect the actual structure of the graph, follow signal flow, and tweak parameters while the audio is playing. It includes built-in visualizations for common node types — waveforms, filter responses, analyser time and frequency views, compressor transfer curves, waveshaper distortion, spatial…

    Mar 2026 · webaudio.studio · its alternatives →

16. 16
    Beats, a web-based drum machinefree▲160

    Hello all! I've been an avid fan of Pocket Operators by Teenage Engineering since I found out about them. I even own an EP-133 K.O. II today, which I love. A couple of months ago, Reddit user andiam03 shared a Google Sheet with some drum patterns [1]. I thought it was a very cool way to share and understand beats. During the weekend I coded a basic version of this app I am sharing today. I iterated over it in my free time, and yesterday I felt like I had a pretty good version to share with y'all. It's not meant to be a sequencer but rather a way to experiment with beats and basic sounds,…

    Jan 2026 · beats.lasagna.pizza · its alternatives →

17. 17
    Ear training using midi.js▲230

    2015 · tonedear.com · its alternatives →

18. 18
    io808▲122

    The classic drum machine synthesizer brought to the web.

    2016 · io808.com · its alternatives →

19. 19
    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 →

20. 20IB
    I Built a Synthesizer with WASM▲25

    2020 · timdaub.github.io · its alternatives →

21. 21IM
    I'm building a browser-based DAW▲179

    2022 · signalsandsorcery.org · its alternatives →

22. 22WD
    Web DSP audio editor▲133

    2018 · dsp.audio · its alternatives →

23. 23
    Virtual Piano v2▲100

    Practice your piano skills online

    2023 · muted.io · its alternatives →

24. 24
    A Simple Online Step Sequencer▲60

    Make simple 4-bar music loops in your browser using this simple online sequencer. A quick way to express your musical ideas and export them as MIDI.

    2022 · muted.io · 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 →