RollTab - AI autocomplete for piano on-device

Show HN: I trained a 125M model to autocomplete piano on-device

RollTab is a free iOS app that turns your MIDI piano into an AI-powered musical partner. Using a 125M-parameter transformer trained on MIDI data, it autocompletes your playing in real time, suggesting notes and chords that follow your style. The app runs entirely on-device, ensuring low latency and privacy. Built with a novel note-level tokenization and refined through direct preference optimization, RollTab offers a unique, responsive way to explore musical ideas and overcome creative blocks.