Works on any firmware
Xteink software & tools
The desktop apps, self-hosted servers, and book converters that get books onto an Xteink X3 or X4. None require custom firmware — though a few go deeper once CrossPoint is installed. All free.
Software & tools
If you install one thing, make it Calibre. The two plugins extend it; the servers and book sources stand on their own.
Calibre
The essential free desktop app for organising, converting and sending books to the Xteink. Converts EPUB / MOBI / PDF, edits metadata, and (with the plugin below) sends wirelessly.
Calibre CrossPoint plugin
Adds CrossPoint as a wireless device inside Calibre and sends EPUBs over WebSocket to the on-device web server — no cable, no SD swap. Requires CrossPoint firmware installed.
CrossPoint SD Calibre plugin (yemM)
Syncs reading progress from the X4 microSD card back into Calibre custom columns. Pull the card, run Calibre, and your progress updates.
epubkit
Generates EPUBs tuned for the X3 / X4 screens with the correct 4-level grayscale treatment and image fit-box handling.
KOReader Sync Server
Self-hostable reading-position sync. CrossPoint's KOReader sync client pushes your reading progress (position + percentage, keyed by document) here so you can pick up where you left off across devices. Docker-friendly.
Calibre-Web Automated
Self-hosted Calibre web library + OPDS server. CrossPoint's built-in OPDS client downloads books straight from it — no USB or file transfer needed. Docker-based.
Project Gutenberg + Standard eBooks
75,000+ free public-domain EPUBs at Project Gutenberg; Standard eBooks re-typesets the classics with far better formatting. Both DRM-free and work on stock or custom firmware.
Also useful: Plugins & customization → for fonts, themes, and SUMI Lua. Those need CrossPoint installed first.
Verified August 11, 2026. Not affiliated with Xteink.