Let’s look at the differences between the two pocket ereaders X4 and X3 by Xteink. The X4 is available now but X3 will start shipping at the end of March 2026.
| Features | XTEINK X4 | XTEINK X3 |
| Price | $69 | $79 |
| Buy From | Official Store | XTEINK store |
| Screen | ||
| Screen | 4.3" Eink | 3.7" Eink |
| PPI | 220 | 250 |
| Frontlight | No | No |
| Touchscreen | No | No |
| Hardware | ||
| CPU | ESP32 | ESP32 |
| RAM | 128 MB | 128 MB |
| Internal Storage | Comes with 32 GB microSD card, supports expansion up to 512 GB | Comes with 16 GB microSD card, supports expansion up to 512 GB |
| External Storage | micro SD slot | micro SD slot |
| Speakers & Mic | No | No |
| Battery | 650 mAh (*A single charge on the eReader lasts up to 14 days, based on 1–3 hours of reading per day.) | 650 mAh (*A single charge on the eReader lasts up to 14 days, based on 1–3 hours of reading per day.) |
| Connect | USB-C | Magnetic pogo pin |
| Wifi & BT | Wi-Fi 2.4 GHz & BT | Wi-Fi (2.4GHz) + BT |
| Software | ||
| OS | Linux | Linux |
| Supported formats | Document: EPUB, TXT / Image: JPG, BMP / Fonts: BIN (More with custom firmware) | Document: EPUB, TXT / Image: JPG, BMP / Fonts: BIN (More with custom firmware) |
| Languages | English, Simplified Chinese, Traditional Chinese, and Japanese | English, Simplified Chinese, Traditional Chinese, and Japanese |
| Sizes & Color | ||
| Dimensions | 114 × 69 × 5.9 mm (4.49" × 2.72" × 0.23") | 98 × 64 × 4.98 mm(3.86" × 2.52" × 0.2") |
| Weight | 74g | 58g |
| Color | Space Black / Frost White | Space Black & Frost White |