You buy a Kindle or Kobo, load it with books, then leave it on a nightstand while your phone follows you everywhere. Reading apps on phones compete with notifications and social feeds, so you end up doomscrolling instead of finishing that novel you downloaded. Xteink’s X4 tries to solve that by becoming a tiny, magnetic e‑ink sidekick that literally rides on the back of your phone, going wherever it goes.
The Xteink X4 is an ultra-thin magnetic back eReader with a 4.3-inch e‑ink screen and a footprint closer to a deck of cards than a tablet. At 114 by 69 by 5.9 millimeters and just 74 grams, it snaps onto MagSafe or Qi2 compatible phones, or onto any handset using the included adhesive magnetic ring, turning your phone into a dual-screen reading machine without much extra bulk.
Designer: Xteink
The 220 ppi e‑ink display is not as sharp as a Paperwhite, but it is perfectly fine for text at this size. There is no touchscreen and no frontlight, just physical page turn buttons and a power key, so it behaves more like a tiny paperback than a gadget. You need ambient light to read, but in return, you get a very focused, distraction-free surface that does not glow or buzz at you.
The internals are minimal: an ESP32 processor, 128 megabytes of RAM, and a bundled 32GB microSD card with support up to 512GB. The 650mAh battery lasts up to fourteen days with one to three hours of reading per day. It charges over USB-C and connects via 2.4GHz Wi‑Fi and Bluetooth for file transfers, so you can grab books wirelessly or just swap the microSD card.
The X4 only supports EPUB and TXT for documents, plus JPG and BMP for images, and does not run third-party apps or connect to any bookstore. You sideload everything, either over Wi‑Fi or by copying files to the card. For people tied to Kindle or Google Play, this is a hurdle, but for readers with DRM-free libraries, it feels refreshingly simple and vendor-neutral, just you and your files.
Xteink markets it as “More Than a Reader,” suggesting you use the X4 as a digital business card, a tiny calendar, a film production workflow board, or a reference screen for notes and checklists. Because it displays static images and text, it doubles as a little always-on panel you can stick to a monitor, fridge, or phone, not just a book page. The magnetic back makes those experiments feel natural and reversible.
The X4 is really for minimalists, tinkerers, and people who like the idea of a dedicated reading screen that goes everywhere their phone does. It is quirky, with no light, no touch, and no store, but those constraints are the point. It is a tiny reminder to read instead of scroll, thin enough to forget until you need a page instead of a feed, and cheap enough at $69 that the experiment feels worth trying even if you already own a proper eReader gathering dust at home.
