The Xteink X4 and X3 are compact e-ink readers released in late 2025 by a Chinese tech company, designed for portability and simplicity [1]. Both models include magnetic mounts compatible with MagSafe smartphones, aiming to attach easily to devices on the go [2, 3, 1].

The X4 weighs very little, featuring a crisp 4.3-inch diagonal e-ink display. It ships with a branded 16GB microSD card and an adhesive metal ring mount for convenience. Reviewer Max Glenister noted, "The X4 is lightweight, properly light, the kind where I’d forget it’s in my pocket" [2]. Battery life is excellent on the X4, and page turns happen instantly with no noticeable ghosting [2, 3].

The X3 is smaller, with a 3.7-inch screen and an improved button layout. It uses a proprietary magnetic USB charging cable, which some users might find inconvenient [3]. Both models rely on physical buttons for navigation since they lack touchscreens, front lights, AI features, and do not support dedicated online bookstores, focusing on a minimal e-reading experience [1]. The Verge reviewer pointed out that navigating the bundled software using buttons instead of a touchscreen can be challenging [3].

Firmware comes minimal but functional out of the box. Users can install custom CrossPoint firmware via terminal or web tools, although units shipped outside China have USB flashing disabled. These users can only install custom firmware through the microSD card, as USB flashing remains locked [2, 3, 1].

Amazon is running a 20% discount on the Xteink X4 and X3 starting June 23 through June 26 for Prime Day. The X4’s price is reduced from $69 to $55.20, while the X3 drops from $79 to $63.20 [3, 1].

Lifehacker praised the devices’ adaptability and extreme portability despite limited processing power and internal storage, stating, "I love them equally. They run on a super cheap chip and are lacking in both processing power and internal storage, but they make up for it with their adaptability and extreme portability" [1].

The Prime Day sale on these pocket-sized e-readers continues until June 26.