This new interactive tool on the reMarkable Paper Pro turns your device into Tom Riddle’s diary from Harry Potter — and it’s one of the smartest e-reader features I’ve seen

• 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 speak to Lord Voldemort himself through one of the best ereaders — well, kind of.

Canadian developer Maxime Rivest used Claude Fable 5 to reimagine Tom Riddle’s famous diary from Harry Potter and the Chamber of Secrets as an interactive AI mod feature for the reMarkable Paper Pro — and the result is pretty impressive.

Just as how the diary is featured in the book and the 2002 movie, ‘Riddle’ allows you to write a message on your ereader using the stylus, and, after a brief pause, your message will then fade into the paper. Then, a reply will shortly appear on the ereader in an animated cursive font similar to Tom Riddle’s — mimicking the feel that someone is writing back to you from a different realm.

It looks pretty clever, doesn’t it? Well, it’s all thanks to the magic powers of AI.

Rivest, who used the reMarkable Paper Pro’s on-device software development kit to create the tool, says he wanted to design an interactive AI experience that felt as though 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 hand-write your note or question, this reads your message as a PNG which is then sent to the AI model. From there, it generates a reply 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 the 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 use it entirely at your own risk. Not affiliated with reMarkable AS. Keep SSH access working before you install anything — that is your escape hatch.”

Since Rivest shared his video demo, it’s garnered a handful of responses that are equal parts amazed and spooked. One user on Reddit says that reMarkable should consider adding this as a flagship tool for their next-gen ereader.

Rivest has been just as active with replying to online comments, noting that this is “just [his] first chapter with the project. Alongside his ‘Riddle’ tool, Rivest also unveiled an interactive Marauder’s Map feature that he's developed, another artifact taken from the world of Harry Potter.