riddle

riddle turns a reMarkable Paper Pro into a diary that writes back. You write with the stylus, pause, and the ink fades into the page while an AI reply writes itself back in a flowing script, stroke by stroke. No screen glow, no chat window, just handwriting talking to handwriting. It is open source under MIT.

This is not a casual install. You need a reMarkable Paper Pro in developer mode with a launcher (xovi + AppLoad) installed, and riddle runs as root, stopping the vendor UI to drive the e-ink display directly. The projects companion tool, remagic, walks you through the setup, but you are still modifying a piece of hardware you paid real money for. Keep SSH access working as your escape hatch.

The AI replies come from a vision model reading your handwriting as an image, either your own OpenAI-compatible API key (OpenAI, OpenRouter, Groq, any provider that speaks the format) or a local pi process if you already run one. Either way you are paying your model provider directly, not riddle.

This is a hobby project for one very specific tablet model, tested on exactly one hardware revision. If you do not own a reMarkable Paper Pro, or are not comfortable running unsigned code as root on your device, this is not for you. If you do, it is one of the more delightful things you will install this year.