Short answer: Choose the X3 if minimum size and the sharpest reported pixel density matter most; choose the X4 Classic for a larger 4.3-inch page with physical buttons and no lighting; and choose the X4 Pro when you want both a touchscreen and a built-in front light. The S4 appears to be a forthcoming model rather than a fully established alternative, while the discontinued original X4 should not be confused with the current X4 Classic (also called X4 V2).
Which Xteink mini ereaders are current?
Xteink’s official homepage currently presents three products: X3, X4 Classic and X4 Pro. Their specifications are not all published in the same place or with the same level of detail, so the comparison below labels official figures and independent reports separately. Check the live product page for inventory, revisions and regional availability before ordering: XTEINK official homepage.
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Two names require particular care. TechRadar’s comparison, published October 10, 2026, discusses an S4 with a 4.3-inch display, but describes it as upcoming and does not establish worldwide availability. PocketInk’s comparison distinguishes the older original X4 from the newer X4 Classic, which is also referred to as X4 V2. A listing that simply says “X4” may therefore refer to a different generation.
At-a-glance comparison
| Model | Display | Dimensions and weight | Controls and lighting | Battery evidence | Other practical details |
|---|---|---|---|---|---|
| X3 | 3.7 inches, 259 PPI | 97.6 × 63.7 × 5.1 mm; 58 g | Physical buttons; no touchscreen; no front light | 650 mAh. Xteink estimates up to 10–14 days at 1–3 reading hours per day. | Magnetic pogo-pin charging; official Xteink app listed; 16 GB microSD included, expandable to 256 GB. |
| X4 Classic | 4.3 inches, 219 PPI reported by independent coverage | 114 × 69 × 4.9 mm; 68 g | Physical buttons; no touchscreen; no front light | 920 mAh on Xteink’s current homepage; no equivalent days-per-charge estimate found. | App transfer and microSD support listed on the official homepage. |
| X4 Pro | 4.3 inches, 219 PPI reported | 111 × 69 × 5.95 mm; 72 g | Touchscreen plus buttons; front light | 1,100 mAh reported; no usage-qualified runtime figure found. | Magnetic phone attachment is described in independent coverage; charging and software are proprietary according to a reviewer. |
| S4 | 4.3 inches, reported | Full dimensions unavailable; 6.98 mm thick and 95 g reported | Touchscreen and front light reported | 1,400 mAh reported by TechRadar; runtime unknown. | Treat as forthcoming until release date, regional stock and final specifications are confirmed. |
| Original X4 | 4.3 inches | Not included in the current comparison | No front light or touchscreen according to independent comparison | Do not transfer a reported 650 mAh figure to newer X4 variants. | Reported as discontinued; not interchangeable with X4 Classic/X4 V2. |
The table combines Xteink specifications with independent reporting, so it is not a same-day laboratory test. PPI, S4 details and some software or charging observations come from secondary sources. Confirm the exact model page and revision before purchase.
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Size, pocketability and reading area
X3: the smallest option
At 97.6 × 63.7 × 5.1 mm and 58 g, the X3 is the smallest and lightest model documented here. It is sized for a trouser pocket, jacket pocket or small bag rather than a conventional paperback-like reading experience. Its 3.7-inch screen has a reported 259 pixels per inch, the highest pixel density in this group. Text and line edges can look crisp at small sizes, but the physical page is still smaller than the 4.3-inch panels.
X4 Classic and X4 Pro: more page, more bulk
The X4 Classic measures 114 × 69 × 4.9 mm and weighs 68 g. The X4 Pro is listed at 111 × 69 × 5.95 mm and 72 g. Their 4.3-inch displays provide more reading area per page, which can reduce page turns for novels, comics with modest layouts or larger text settings. The Pro is thicker and heavier than the Classic despite being slightly shorter in the reported dimensions.
A 4.3-inch screen is not automatically sharper: independent coverage reports 219 PPI for the X4-family panels versus 259 PPI for X3. The practical choice is therefore area versus density. If you enlarge fonts, the larger panel leaves more usable lines; if you carry the reader everywhere and prefer compact text, the X3’s density and footprint are more compelling.
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Lighting, touch and physical controls
Models without a front light
X3 and X4 Classic use buttons and do not have a built-in front light or touchscreen. They work best in a lamp-lit room or daylight. In bed, on a dim train or during a power outage, you need an external reading light. Xteink’s homepage lists a magnetic reading light, but compatibility with every case or third-party accessory is not established; check the attachment and clearance for your exact model.
X4 Pro’s feature advantage
X4 Pro adds a touchscreen while retaining physical buttons and includes a front light. That combination lets you turn pages with buttons, tap menus or use the display in low light without carrying a separate lamp. The trade-off is the 72 g body and 5.95 mm thickness, plus the additional power draw that lighting and touch hardware can introduce in actual use.
S4 status
TechRadar reports a touchscreen and front light for S4, but the same comparison treats it as upcoming. Until Xteink publishes a final product page and a release region, regard those features as reported specifications rather than a guaranteed retail configuration.
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Battery life: capacity is not days of reading
The only usage-qualified estimate
The clearest endurance claim is on Xteink’s X3 specification page: “A single charge on the eReader lasts up to 10~14 days, based on 1–3 hours of reading per day.” This is the manufacturer’s estimate, not an independent standardized test. The same page lists a 650 mAh battery. Read the hours-per-day condition with the 10–14-day figure; it should not be treated as a promise for continuous reading, heavy lighting use or wireless activity. See the full specification at Xteink X3 product page.
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What the other capacities tell you
Xteink’s current homepage lists 920 mAh for X4 Classic and 1,100 mAh for X4 Pro. TechRadar reports 1,400 mAh for S4. Those numbers describe stored charge, not a common runtime test. Front-light brightness, refresh behavior, wireless features, firmware efficiency and daily reading time all change endurance, so a higher mAh rating cannot prove that one model lasts longer.
A TechRadar reviewer wrote that the X4 Pro battery seemed long-lasting during a month-long review published August 29, 2026, but that observation does not supply a controlled number of days per charge. There is no independent, standardized battery comparison in the available coverage.
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Charging and storage
X3 magnetic charging
X3 uses a magnetic pogo-pin connection rather than a conventional USB socket on the reader. The cable can snap into place quickly, but it is also easier to misplace and less interchangeable than a standard cable. Confirm the connector and keep the supplied lead available when travelling.
X4 models and proprietary accessories
The official homepage lists app transfer and microSD support for X4 Classic. The available X4 Pro review describes proprietary charging, so do not assume that an X3 lead or a generic replacement will fit. Verify the connector shown for the exact revision before buying a spare.
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X3 includes a 16 GB microSD card and supports expansion to 256 GB according to its product page. The X4 Classic listing also mentions microSD, but the listing does not state an identical included-card capacity or maximum for that model. Treat those as model-specific details rather than a universal Xteink specification.
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Software, file transfer and ecosystem limits
How the official workflow is described
Xteink’s X3 page says the device is compatible with the official Xteink app only. That implies a more controlled transfer workflow than an open Android tablet: install the supported app, pair or connect the reader as instructed, and move compatible ebook files through that app or the device’s storage. Exact menu labels can change with firmware, so follow the current model’s manual.
What independent reporting adds
TechRadar coverage describes manual ebook transfer and notes that these readers cannot run Kindle or Kobo apps. PocketInk and TechRadar also discuss alternative firmware possibilities and trade-offs. Firmware support can differ by model and revision; installing unofficial software may affect compatibility, recovery options or warranty coverage. Before changing firmware, save your books elsewhere, identify the exact model, read the current release notes and confirm a recovery method.
Choose this ecosystem if you are comfortable managing DRM-free files and a manufacturer-specific app. If your library depends on a particular store’s app, subscription or locked-in reading system, confirm file and account compatibility before purchase rather than assuming the tiny reader behaves like a general-purpose Android device.
Which model should you buy?
Choose X3 for maximum pocketability
- Pick X3 when 58 g and the smallest documented body matter more than page area.
- Its reported 259 PPI suits sharp small text, but expect fewer words per page than on a 4.3-inch model.
- Accept button-only navigation, no front light, magnetic pogo-pin charging and the official-app workflow.
Choose X4 Classic for a larger button-controlled page
- Pick X4 Classic when you want a 4.3-inch display and physical page-turn buttons.
- It is thinner than the Pro in the reported dimensions, at 4.9 mm and 68 g.
- It has no touchscreen or front light, so plan for external illumination at night.
Choose X4 Pro for built-in lighting and touch
- Pick X4 Pro when a front light is essential or you want touchscreen navigation alongside buttons.
- Its 4.3-inch screen gives the larger reading area of the X4 family.
- Budget for 72 g weight, 5.95 mm thickness and model-specific charging or software constraints.
Wait for confirmation before choosing S4
Consider S4 only after Xteink confirms release timing, your region, final dimensions, software and warranty support. The reported 95 g weight, 6.98 mm thickness, front light and 1,400 mAh battery describe secondary coverage of a forthcoming product, not a verified universally available model.
How to avoid buying the wrong X4
- Read the complete listing title and look for “X4 Classic” or “X4 V2,” not just “X4.”
- Match the listed body dimensions and weight against the generation you intend to buy.
- Confirm whether the listing explicitly promises a front light and touchscreen; the original X4 and X4 Classic do not have them according to the comparison coverage.
- Check the battery figure and charging connector on the exact product page instead of carrying over specifications from another X4 variant.
- Verify seller, region, return policy, firmware version and current stock because prices, inventory and revisions can change.
Practical checks before ordering
- Lighting: If you read in darkness, select X4 Pro or plan an external lamp for X3/X4 Classic.
- Input: Readers who dislike touchscreens may prefer the button-only X3 or Classic; readers who annotate menus or browse visually may prefer Pro.
- Charging: Confirm whether the cable is magnetic pogo-pin, proprietary or another connector, and whether replacements are available in your region.
- Library: Check that your books can be transferred in the supported app or as files and that required DRM or store apps are compatible.
- Carrying protection: X3 includes a screen protector. For any case or protector, match the exact model’s dimensions, camera-free cutouts and button locations. The X4 Pro review describes phone-mounted carrying as exposed, so protect the screen and magnets when transporting it.
- Battery expectations: Use the X3’s 10–14-day figure only with its stated 1–3-hour daily reading condition; treat other mAh values as capacity data, not runtime rankings.
Bottom line
For the smallest credible pocket reader, X3 is the clear choice. X4 Classic is the larger, button-focused option if you can live without illumination. X4 Pro is the most capable current model on paper because it combines a 4.3-inch display, touchscreen and front light, at the cost of extra weight, thickness and proprietary hardware considerations. S4 and the original X4 belong in a separate category until release and generation details are confirmed.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
