An e-reader magneted to the back of a smartphone, just as the prophecy foretold.

The market for small e-readers has been booming lately. Earlier this year, Jason took a look at the Xteink X4, a pint-sized reading device that was about as light and small as they come. But those maniacs at Xteink weren’t done yet: they followed it up with the $79 X3, which is unbelievably even lighter and smaller.

I wouldn’t blame you for wondering if there’s such a thing as too small and light—at 3.84 inches by 2.51 inches (and just 0.2 inches thick) the X3 is still larger than, say, a credit card, but not by much. The screen itself measures just 3.7 inches, more than half an inch smaller than the X4’s 4.3 inch, but its 259 ppi resolution still makes it plenty easy to read on.1 At that size it’s little imposition to take it with you wherever you go. Easy to lose? Maybe. Easy to love? Yes.

For one thing, this small size unlocks at least one capability that the X4 couldn’t fully deliver upon—the ability to stick to the back of your phone. Like the X4, the X3 has a MagSafe-compatible magnet in its rear case and it fits just about perfectly on the back of my iPhone 17 Pro, nestled below the camera plateau.