Riddle (reMarkable)

Canonical version: Riddle (reMarkable).

Riddle turns a reMarkable Paper Pro into Tom Riddle's diary. You write with the pen, pause for a few seconds, and the answer appears on the page as flowing handwriting. No screen glow, no keyboard, no chat window. Built by Maxime Rivest, MIT licensed, around 1.6k stars on GitHub.

How it works

• Captures raw pen input at the full 4096 pressure levels, then commits the page to a PNG after roughly 2.8 seconds of idle time
• Sends that PNG to a vision-capable LLM (any OpenAI-compatible API, or the local pi resident process)
• Converts the reply into single-pixel pen paths (Zhang-Suen thinning) and animates them stroke by stroke; about one second to first ink
• Streams sentence by sentence, so the diary starts writing before the model has finished thinking
• Remembers roughly 400 recent pages locally under /home/root/riddle-data/memories. Ask "show me what I wrote about X" and it rewrites past pages in your own handwriting, dates included.
• Gestures: pen-flip erasing, five-finger exit, a big question mark to summon a query

It needs a Paper Pro in developer mode with the xovi + AppLoad launcher. The easiest install is remagic install riddle. On privacy: only the page PNGs leave the device, there is no telemetry, and replies aren't stored to disk unless you use pi's session history.

Why it matters

Most AI interfaces pull you toward a glowing rectangle. This one meets you on paper, the most natural thinking surface we have. Journaling with an interlocutor that remembers what you wrote last month, without leaving the page, is a genuinely new interaction model; the fact that it answers in handwriting rather than rendered text is what sells the illusion. A lovely reminder that AI doesn't have to look like a chat app.

References

• Repository: https://github.com/MaximeRivest/riddle
• Quill, the display backend: https://github.com/MaximeRivest/quill
• remagic, the installer: https://github.com/maximerivest/remagic

Related

• reMarkable

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