Diptyx ESP32-S3 Open-Source Dual-Screen E-Reader Funded

Diptyx ESP32-S3 E-Reader

The Diptyx E-Reader is an ESP32-S3–based, open-source e-reader designed for simple, distraction-free reading. Its dual e-ink display folds shut like a book, protecting the screens without the need for a case and making it easy to carry anywhere. Thanks to instant wake-up, automatic standby, and highly efficient power management, the device can run for weeks on a single charge and power on in seconds.

Built around open hardware and custom open-source firmware, the Diptyx E-Reader lets users fully own their device and their books. EPUB files can be transferred directly over USB Type-C, with no DRM, no accounts, and no internet connection required. The unique transparent construction showcases the internal boards with decorative artwork, while keeping all active electronics safely protected, combining practicality with a distinctive design.

Previously, we covered the Elecrow 5.79-inch low-power e-paper display, the LILYGO T-Deck Pro, the LILYGO T5 E-Paper S3 Pro, and Waveshare ESL dot-matrix e-paper displays—feel free to check them out if you’re interested in related products.

Diptyx E-Reader top and bottom cover

Diptyx E-Reader Specifications:

• Wireless module: ESP32-S3-WROOM-1
  • SoC: Espressif ESP32-S3-N16R8
  • CPU: Dual-core LX7 @ up to 240 MHz with vector extensions
  • Memory: 8 MB PSRAM
  • Flash storage: 16 MB SPI flash
• Removable storage: 2 GB microSD card (user-replaceable)
• Connectivity: Wi-Fi 4 and Bluetooth 5 (LE/Mesh, firmware-disabled by default)
  • Antenna: Onboard PCB antenna
• Displays: 2x 5.83-inch 648 × 480 e-ink black & white panels
• USB: USB Type-C for charging and mass storage
• Controls: Physical buttons for navigation and power
• Batteries: 2x 1,500 mAh Li-Po batteries
• Dimensions:
  • Closed: 120 x 150 x 14 mm
  • Opened: 226 x 150 x 14 mm
• Weight: 300 g

Diptyx ESP32-S3 E-Reader Inside Hardware

Device longevity and the right to repair are core principles behind the Diptyx E-Reader. The enclosure is designed in FreeCAD, the electronics are developed in KiCad, and the firmware is built using VS Code, ensuring the entire platform is based on open-source tools. Once the campaign concludes and the design is finalized, all design files will be released as open source, making customization and repair straightforward. The firmware, which builds on existing open-source projects, will be published under the MIT license, encouraging users to develop and share custom software and applications.

The company provides a comparison table of the Diptyx E-Reader against two commercial products, the Kobo Clara BW and the Kindle Paperwhite (11th gen), highlighting how Diptyx differs in design philosophy and user control. Unlike the closed, ecosystem-locked Kobo and Kindle devices, Diptyx emphasizes open-source hardware and software, a dual-screen foldable form factor with physical buttons, modular and repairable construction, expandable microSD storage, and freedom from DRM-restricted workflows, positioning it as a user-owned alternative to mainstream e-readers.

Comparison table

The Diptyx E-Reader is available on Crowd Supply with a pledge price of $230 and has already raised $64,440 at the time of writing. Shipping is free within the US, while international shipping adds $12, and deliveries are expected to begin in May 2026. More photos and additional details can be found on the diptyx’s website.

Images used courtesy of Diptyx