riddle

Riddle turns a reMarkable Paper Pro into an interactive AI-powered version of Tom Riddle's enchanted diary. Users write directly on the e-ink page, pause, and watch their ink fade before a handwritten response appears stroke by stroke. The Rust application captures pressure-sensitive pen events, converts completed pages to images, and sends them to a vision-capable language model. Responses are transformed into thin pen paths and animated through either a windowed display or a low-latency full-screen takeover mode. Finished pages can be stored locally with their pen strokes, transcription, and reply for later recall. The pen remains the primary interface, with gestures for erasing, opening help, retrieving memories, and leaving the application. Installation requires developer access and currently targets specific reMarkable Paper Pro software versions, so users modify the device at their own risk.