Open-source Riddle project turns reMarkable Paper Pro into an AI-powered Tom Riddle diary

A GitHub project called riddle lets reMarkable Paper Pro users write with a stylus, then watch their ink fade as an AI-generated reply appears stroke by stroke. The tool requires developer mode, a launcher, and optionally an OpenAI-compatible API key, and it directly controls the tablet’s e-ink display.

The project shows how ambient AI interfaces can move beyond chat boxes into more tactile, themed experiences. It also highlights the growing maker interest in repurposing e-ink devices, though root access and vendor UI takeover make this a niche, experimental use case rather than a mainstream app.