- A developer has created an AI reader tool that replicates Tom Riddle’s diary from Harry Potter
- It uses an image input LLM that reads your handwritten messages as PNGs
- The creator keeps the tool’s interface simple, but it’s not the easiest to install
Harry Potter fans listen up: someone has managed to develop a feature that lets you talk to Lord Voldemort himself through one of the best readers – well, sort of.
Canadian developer Maxime Rivest used Claude Fable 5 to recreate Tom Riddle’s famous diary from Harry Potter and the Chamber of Secrets as an interactive AI mod for reMarkable Paper Pro – and the result is quite impressive.
Just like how the diary is featured in the 2002 book and movie, ‘Riddle’ allows you to write a message on your ereader using the pen, and after a short pause your message will disappear into the paper. After that, a response will shortly appear on the reader in an animated cursive font similar to Tom Riddle’s – mimicking the feeling of someone writing back to you from another world.
It looks pretty smart, doesn’t it? Well, it’s all thanks to the magical powers of AI.
I love it when technology feels like magic. pic.twitter.com/7wbjyhyL8D4 July 2026
Rivest, who used reMarkable Paper Pro’s on-device software development kit to create the tool, says he wanted to design an interactive AI experience that felt like you were writing in a regular notebook. There are no touchscreens, keyboards or animated chat bubbles involved, instead he sticks to simplicity.
The feature is built with an image input compatible LLM, so when you handwrite your note or question, this reads your message as a PNG, which is then sent to the AI model. From there, it generates a response and sends it back to the E Ink display. According to its GitHub listing, ‘Riddle’ works with OpenAI, OpenRouter and Groq APIs and local servers that support image input.
That said, downloading it isn’t the easiest. For starters, it only works on reMarkable Paper Pro in developer mode with a launcher installed. The tool’s GitHub page also states the following:
“This modifies your device. It runs as root, stops the vendor UI (in takeover mode) and drives the e-ink engine directly. It has only been tested on a reMarkable Paper Pro (ferrari, aarch64, OS 3.26-3.27). It may not work on other models or OS versions, and you do not use it at your own risk, and you cannot reinstall it at your own risk. whatever – it’s your escape hatch.”
Since Rivest shared its video demo, it’s gotten a handful of responses that are equal parts amazed and horrified. A user on Reddit says that reMarkable should consider adding this as a flagship tool to their next generation ereader.
Rivest has been equally active in responding to online comments, noting that this is “just [his] first chapter with the project. Alongside his ‘Riddle’ tool, Rivest also revealed an interactive Marauder’s Map feature that he has developed, another artifact drawn from the world of Harry Potter.
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