Xteink X4 Pro: $99 phone ereader
The Xteink X4 Pro is a tiny, $99 ereader with magnets for attaching to a phone, but its fragile design and restrictive software limit its appeal for most
The Xteink X4 Pro is a $99 ereader that launched in 2026. It measures 111 x 69 x 5.95mm, weighs 72g, and uses built-in magnets to stick to the back of a phone.
According to a review by TechRadar, the device is extremely slim and light. Its primary draw is the ability to attach directly to a smartphone, making it highly portable. The reviewer found reading on its 4.3-inch touchscreen with a front light to be a pleasure.
Fragile and Exposed Design
A major concern is durability. The Xteink X4 Pro ships with a basic flip cover, but the reviewer reported the magnets were not strong enough to securely attach it to a phone inside a case. This leaves the device exposed and liable to break if the phone is dropped. The epaper display is also noted as being very fragile.
While attaching it to a phone is optional, the reviewer states the magnets were the main attraction. Without a secure attachment, the device's core premise is compromised.
Restrictive Software and Charging
The device runs on Xteink's own operating system, which the reviewer describes as ugly, clunky, and unpleasant. However, the version sold on Xteink's site is a developer edition that allows users to easily flash alternative firmware.
Most owners reportedly ditch the stock software quickly. The reviewer flashed the device with CrossInk firmware after half an hour, which offers more customization and book transfer options. The lack of Android means it cannot run the Kindle or Kobo apps. Getting books onto the device often requires buying them elsewhere, transferring them, and potentially removing DRM, which is described as a chore.
The battery life is noted as long-lasting. To maintain its small size, it uses a proprietary charger instead of USB-C, which the reviewer calls slightly fiddly.
A Niche Device for Tech Enthusiasts
The reviewer concludes the Xteink X4 Pro is not for the average ebook reader. It is suited for people comfortable with technology who enjoy configuring devices. The friction points, including software and book transfer hassles, mean the reviewer will likely return to using their ViWoods AiPaper Reader.
Despite its issues, the reviewer is having fun with the device and currently uses it as their main ereader due to its constant presence attached to their phone. It makes the ViWoods device look big by comparison. The reviewer suggests that if a future Xteink X5 Pro model were to run Android, they might reconsider their choice.
