The Lineup
PocketInk covers any pocket-sized ink reader. We start with Xteink because it's what we use. Here's the whole lineup — the X3 and X4 you can buy today, and what's confirmed and rumored about what's next.
Every spec is tagged by how confirmed it is, so nothing speculative reads as fact. Jump to the full comparison →
The smallest one — pogo-pin charging, phone-back carry.
The most pocketable Xteink. A 3.7-inch, 259-PPI E Ink reader that rides on the back of your phone via magnets. Charges over a proprietary magnetic pogo-pin cable rather than USB-C, which is its one real quirk.
The mainstream pick — bigger screen, plain USB-C.
The 4.3-inch model most people buy. ESP32-powered, USB-C charging, magnetic-ready, and the centre of the community firmware and modding scene. No front light and no touchscreen — that is the design, not an omission.
Not on xteink.com yet. We track these from press coverage and the community — each page links to where the information comes from so you can follow it yourself.
The Android pivot — sideload Kindle, Kobo, anything.
Xteink's first Android model. Android 11 means you can sideload Kindle, Kobo, or any reading app — a clean break from the ESP32-based X3/X4 — and it adds a front light for the first time. Launched in China; an international release is expected around July 2026. Specs below are press-reported and community-consistent but not yet on xteink.com.
Rumored touchscreen X4 with a backlight — not Android.
A rumored touchscreen X4 with a backlight. Despite the name it is not the Android device (that is the S4) — reports point to a rewritten Xteink OS, possibly moving off ESP32 to an Allwinner/Linux chipset. In pre-production with no firm price or date. Everything here is single-source and soft; treat as speculation.
| Spec | X3 | X4 | S4 soon | X4 V2 Pro soon |
|---|---|---|---|---|
| OS / platform | Proprietary firmware * | Proprietary firmware * | Android 11 * | Xteink OS (Linux-based) ? |
| Screen | 3.7" E Ink | 4.3" E Ink | 4.3" E Ink * | E Ink, touchscreen ? |
| Resolution | 259 PPI | 220 PPI | Not disclosed ? | Unknown ? |
| Front light | No | No | Yes (adjustable temp) * | Yes (backlight) ? |
| Touchscreen | No | No | Not disclosed ? | Yes ? |
| Chip | ESP32-based * | ESP32 | Not disclosed ? | Allwinner F1C100s/200s? ? |
| Storage | 16 GB microSD, exp. 256 GB | 16 GB microSD, exp. 256 GB | 32 GB + microSD · 2 GB RAM * | Unknown ? |
| Charging | Magnetic pogo-pin | USB-C | USB-C * | Unknown ? |
| Battery | 650 mAh | 650 mAh | 1,400 mAh * | Unknown ? |
| Weight | 58 g | 77 g | 95 g * | Unknown ? |
| Thickness | 5.1 mm | 5.9 mm | 6.98 mm * | Unknown ? |
| Magnetic mount | Yes | Yes | Yes (to phone) * | Likely ? |
| Price | $79 | $69 | CNY 339 (~$50) · ~$70 intl est. * | Unconfirmed ? |
X3 and X4 specs verified against xteink.com (June 2026). S4 and X4 V2 Pro are compiled from press and community sources and are not yet on the official store — open each device's page for the source links. Independent list, not affiliated with Xteink.