About
Home of Webrack, a modular synth lab in your browser.
By IBPSynths · Last updated 2026-05-08
What this is
Synths.pw is the home of Webrack, a real modular synthesizer that runs in your web browser. Drag modules, patch cables, twist knobs, hear sound. No install, no account required to play. It is the lab at the heart of the project, and it stays free forever.
The site also hosts the Academy, our free interactive courses on sound synthesis. Every step pairs a short prose explanation with a custom hands-on widget and a real Webrack rack: widgets, 3D scenes, ear-training games, and real synth audio you control.
How this started
Synths.pw began in 2021, during the COVID lockdowns, as an attempt to explain sound synthesis to one person. The conversation stalled almost immediately. The vocabulary was foreign, the diagrams in books were static, and the videos online either skipped the fundamentals or buried them under hours of preamble. The thing missing was a place where you could see and hear what each idea actually does as you read about it.
So we started building one. The first prototype was crude: a handful of oscillators, a filter, a sequencer, all in a browser tab. It made sound, but barely. Three full redesigns of the engine later — across roughly five years of work, from 2021 to today — it stopped being a prototype.
Today the engine drives a curated library of oscillators, filters, envelopes, sequencers, samplers, drum voices, and effects. It hosts native ports of legendary modules from the Mutable Instruments family. It tracks every Eurorack convention end-to-end, so the skills you build here transfer directly to a real hardware rig.
The lessons that started this whole thing are still the centre of gravity. Webrack exists so the lessons can be hands-on, and the Academy is built around that same idea: read a paragraph, twist a knob, hear what changed.
Why this exists
Modular synthesis is one of the most rewarding ways to learn how sound actually works. The hardware is also expensive, intimidating, and gatekept. Open-source modular software exists, but it does not pair structured learning with a real working instrument in the same place.
Synths.pw fills that gap. The lab is a real instrument, not a toy. The lessons are interactive, not passive. The web makes it free.
Who is behind it
Synths.pw is built and maintained by IBPSynths (Itsy Bitsy Pixels Media Inc.), the broader umbrella for our work in synth design, audio software, and sound education.
Reach out: contact@synths.pw, @webrack on X, Bluesky, the Discord, or the r/Webrack subreddit.
How to start
Open Webrack and patch a cable. Or take Eurorack 101 if you want a guided walk through the basics. Both are free, both run in your browser, both work on a phone.
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