Diptyx: An Open-Source E-Reader That Folds Shut Like a Book

Diptyx is an open-source e-reader built to open like a book. Two 5.83-inch e-ink panels sit on either side of a central hinge, so the device folds flat and shields its own screens without a case. It runs on an ESP32-S3, takes EPUB files over USB-C, and is funding now on Crowd Supply for a $230 pledge.

The design decisions are where it gets interesting. The ESP32-S3 ships with WiFi and Bluetooth on the chip, and Diptyx switches both off in firmware on purpose. No store, no sync, no notifications. You copy books over a cable and read. Two Li-Po cells paired with deep-sleep e-ink stretch a single charge to weeks. The enclosure is drawn in FreeCAD, the board in KiCad, and the exposed PCB layers carry art-nouveau illustrations instead of active circuits, so a scratch stays cosmetic. After the campaign closes, every file goes public.

A reader that folds shut like a codex, with the radio deliberately quiet. This is what we mean by designing for well-being over raw capability: the most considered feature here is a connection the maker chose to leave unused. What happens when open source starts to mean the freedom to remove things, not only add them? And once the book form comes back as hardware, does the single glass slab start to look like the odd choice?