The Xteink X4 E-Ink Reader
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A £40 e-ink reader the size of a phone, improved by custom firmware.
The Xteink X4 is a lightweight, pocket-sized e-ink reader that costs £40. Its stock firmware is minimal but usable. Custom firmwares like CrossPoint (v1.3.0, OTA updates), Papyrix (advanced typography with Knuth-Plass line breaking), and Inx (tabbed UI with per-book stats) significantly improve the experience. The device fits in any pocket, has instant page turns, and is more portable than full-size readers like the Kobo Clara. Flashing custom firmware takes about two minutes via terminal or a web-based flasher.
What commenters are saying
Owners largely agree the X4 excels as a portable, open reader, with many praising its tiny size and custom firmware ecosystem like CrossPoint and CrossInk. Multiple commenters recommend it as a secondary reader for carrying everywhere. A detailed comparison between the X4 and its predecessor X3 notes the X4 has a larger display, USB-C, and better firmware support, while the X3 offers crisper text and whiter display. One user reports reading three books on the X4 with 60% battery remaining.