A browser-based sampler and step sequencer. Four sample slots, sixteen steps, no installation required.
What it is
Phosphor is a minimal beat-making tool that runs entirely in your browser. Load samples from the included library or upload your own, arrange them on a 16-step grid, and loop. That’s it.
The interface is designed for touch screens first – usable on a phone while waiting for the train, or on a tablet next to your hardware setup.
Features
- 4 sample slots – Enough for a basic kit: kick, snare, hat, texture
- 16-step sequencer – Classic grid, toggle steps on/off
- Sound library – Curated samples recorded from analog hardware
- Custom upload – Drag your own sounds in
- Transport controls – Play, stop, tempo adjustment
- No account required – Open and use
Why
Most browser audio tools are either toys with limited functionality or DAW-lite applications bloated with features. Phosphor sits in the middle: functional enough to sketch real ideas, constrained enough to stay focused.
The included samples were recorded from Roland hardware – the same gear used for strangeloopwave productions. They have weight and character, not generic sample pack sterility.
Technical
Built with vanilla JavaScript and the Web Audio API. No frameworks, no build process, no dependencies. The source is readable.
Mobile-first means it actually works on mobile – not a desktop app awkwardly scaled down. Touch targets are sized for fingers, the grid responds to taps, and the layout adapts to portrait orientation.