- A developer has created a reading tool with artificial intelligence that replicates Tom Riddle’s diary from Harry Potter
- Uses an image input LLM that reads your handwritten messages as PNG
- The creator keeps the tool’s interface simple, but it is 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 e-readers around… well, sort of.
Canadian developer Maxime Rivest used Claude Fable 5 to reinvent Tom Riddle’s famous diary. Harry Potter and the Chamber of Secrets as an interactive AI modification feature for reMarkable Paper Pro, and the result is quite impressive.
Just like the diary appears in the book and the 2002 film, ‘Riddle’ allows you to write a message on your e-reader using the stylus and, after a brief pause, your message will fade to the paper. Then, a response will soon appear on the e-reader in an animated, Tom Riddle-like cursive font, mimicking the feeling that someone is writing to you from a different realm.
Seems pretty smart, doesn’t it? Well, it’s all thanks to the magical powers of AI.
I love when technology feels like magic. pic.twitter.com/7wbjyhyL8DJuly 4, 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 feels like you’re writing in a regular notebook. There are no touch screens, keyboards or animated chat bubbles, instead sticking to simplicity.
The feature is built with an LLM that supports image input, so when you handwrite your note or question, it 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 screen. According to its GitHub listing, ‘Riddle’ works with OpenAI, OpenRouter, and Groq APIs, and local servers that support image input.
That said, downloading it is not the easiest. For starters, it only works in 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 acquisition mode), and controls 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 use it at your own risk. It is not affiliated with reMarkable AS. Keep SSH access working before installing anything; that’s your way escape.”
Since Rivest shared his demo video, he’s gotten a handful of responses that are equal parts amazed and scared. One Reddit user says reMarkable should consider adding this as a flagship tool for its next-generation e-reader.
Rivest has been just as active in responding to online comments, noting that this is “simply [his] First chapter with the project. In addition to his ‘Riddle’ tool, Rivest also introduced an interactive feature of the Marauder’s Map he has developed, another artifact taken from the world of Harry Potter.
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