Post-install · CrossPoint required

Xteink plugins & customization

CrossPoint has no plugin store. What the community calls Xteink "plugins" are custom fonts, sleep-screen images, and built-in themes — plus the SUMI Lua system if you want genuinely installable extensions. All free.

Flash first. Everything on this page needs CrossPoint (or a compatible fork) on your Xteink X3 or X4. None of it works on stock Xteink firmware. Haven't flashed yet? Find your firmware first.

Extensions & customization

7 ways to make CrossPoint on the Xteink X3 and X4 your own. Each card says what it changes on the device and links straight to the source.

Custom fonts (.cpfont)

The real "plugin" layer for CrossPoint. 23+ prebuilt families (Literata, Merriweather, Atkinson Hyperlegible, IBM Plex…). Download over WiFi on-device, upload via the web UI, or copy to /.fonts/ on the SD card. Build your own from any TTF with the font builder.

crosspoint-fonts

Themes

Selectable built-in UI themes — Classic, Lyra, Lyra Extended, RoundedRaff. (Custom user themes are not installable; you pick from the built-ins.)

crosspointreader.com

Sleep-screen images

Drop 24-bit BMPs (480×800 for X4, 528×792 for X3) into /.sleep/ on the SD card, or a single sleep.bmp in the root, for custom wallpapers/screensavers.

guide

Calibre plugin

A desktop Calibre device driver that sends EPUBs to the reader over WiFi/WebSocket with auto-discovery. Installed into Calibre, not the device.

calibre-plugins

.xtc / .xtch converters

Convert books to the device-native format for the fastest rendering and control over grayscale: bigbag/epub-to-xtc-converter (web + CLI) and CrazyCoder/cr2xt (desktop). For manga, comics, and PDFs, varo6/xtcjs adds dithering and spread-splitting.

xtcjs (manga/PDF)

SUMI Lua plugins

The most genuine plugin system in the scene: SUMI firmware ships a Lua scripting framework for user-written extensions, alongside ~20 built-in apps and a dictionary. If you actually want “installable plugins”, this is it.

SUMI

PlusPoint (experimental OS)

Often mislabelled as a JavaScript-app platform — it isn’t. PlusPoint is a from-scratch C++ OS proof-of-concept for the X4 (the app launcher isn’t built yet): promising, but not a working plugin system today. For real scriptable plugins, use SUMI (Lua).

pluspoint-reader

Also useful: Software & tools → for Calibre, KOReader sync, and OPDS servers. Those work on any firmware, stock included.

Verified August 11, 2026. Not affiliated with Xteink.