ScratchStream

Code to Muscle

About this app

ScratchStream is a vinyl scratch instrument. Tune into college radio, load your own audio, or grab the mic — then scratch it like wax.

REAL SCRATCH PHYSICS
Touch the on-screen disc to scratch with velocity-based platter physics. Drag the crossfader to cut. Everything responds in real time with sub-5ms latency powered by a C++ audio engine.

FREE FEATURES
- Scratch any Icecast/Shoutcast radio stream
- On-screen vinyl disc with circular gesture control
- Live waveform visualization
- Crossfader for chirps, flares, and transforms
- Cue points — tap to mark, tap to jump back
- Load local audio files or bundled samples
- Griffin PowerMate USB knob support

PRO UNLOCK ($4.99 one-time)
- Half-speed and double-speed detents
- Loop freeze — lock a segment and scratch it forever
- WAV recording — capture your performances
- Sample capture — long-press to save loops
- LFO auto-scratch — automated rhythmic patterns
- Platter weight — light 7" to heavy 12" feel
- Vinyl noise layer — crackle, hiss, and rumble
- FX chain — filter sweep, delay, bitcrusher
- Unlimited station presets
- Full PowerMate LED state machine
- No subscription. No ads. Ever.

COLLEGE RADIO READY
Ships with KPSU Portland, KEXP Seattle, and KAOS Olympia. Add any Icecast or Shoutcast stream URL.

PRIVACY
No account required. No ads. Anonymous performance telemetry only.

What’s new

Improved crash and error reporting: station names, error causes, and session context are now captured in diagnostics so stream failures can be fixed faster. No user-facing changes.