Xteink S4 vs X4: No Confirmed International Release

The Xteink S4 has no confirmed international release as of August 2026, and there is no announced date. Joshua Lowcock’s tracker reports no current plan to sell the S4 on Amazon or through official channels, and no S4 appears in any FCC database. Press coverage of a China listing puts it at CNY 339 (~$50) with Android 11, a touchscreen, and an adjustable front light. Lowcock reports the April China pre-orders never shipped. The readers you can buy today are the $69 Xteink X3 and the $99 Xteink X4 Pro. The original X4 is discontinued. Every spec below is labeled reported or official.

AvailabilityS4 vs X4SpecsPriceS4 vs X4 ProSame as X4 V2 Pro?FirmwareRedditWait or Buy?FAQ

When Will the Xteink S4 Be Available?

Status as of August 24, 2026

There is currently no international release date for the Xteink S4, and there may never be one. Joshua Lowcock’s S4 tracker reports that Xteink has no current plans to release the S4 internationally, on Amazon or through official channels, citing his China supply-chain sources and the S4’s absence from any FCC database. If that holds, importing from China is the only route. Even the China launch is murkier than the May headlines: Good e-Reader and Notebookcheck reported the S4 on sale domestically, but Lowcock reports the April pre-orders never shipped and the expected July China ship window slipped during compliance testing.

The S4 first surfaced through Xteink’s own channels in mid-April 2026: an official teaser video and a Note.com blog post titled “A Sneak Peek at the New Generation Android-Powered Pocket E Ink Reader,” followed by a price-announcement YouTube Short. The sourced sequence:

For the live S4 device page, see /devices/s4/.

Xteink S4 vs X4: What’s the Difference?

The Xteink S4 runs full Android 11 with a touchscreen and front light, while the Xteink X4 runs proprietary ESP32-C3 firmware with physical buttons, no touch, and no light. The S4 is a reading-apps device, Kindle and Kobo via sideloading. The X4 is a button-only microcontroller reader that the CrossPoint community flashes with custom firmware. They share a 4.3-inch pocket body. The original X4 is discontinued. For the X4 Pro column, see the X4 vs S4 vs X4 Pro comparison.

The figures in the S4 column come from press coverage of the on-sale China unit (Good e-Reader, Notebookcheck), not our own hands-on testing. The X4 column is from the official xteink.com listing.

Two X4 facts that get mixed up with S4 listings:

• The X4 is a microcontroller, not a 32 GB storage device. It runs on an ESP32-C3 with a microSD slot. There is no 32 GB internal storage and no 32 GB-to-16 GB downgrade. The S4’s 32 GB is a reported Android-device number. Usable X4 RAM is about 380 KB, which is why stock firmware sticks to DRM-free EPUB and TXT.
• “Xteink backlight” is the X4’s most-searched missing feature. The base X4 has no front light. If that is a deal-breaker and you want a shipping device, the X4 Pro already has one. The S4 remains China-only.

Xteink S4 Specs (Reported China Unit)

Reported Xteink S4 specs: a 4.3-inch E-Ink touchscreen, Android 11, 2 GB RAM, 32 GB storage, an adjustable front light, a 1,400 mAh battery, USB-C, and a 95 g body, priced at CNY 339 ($50) in China. Every figure comes from tech press covering the China retail listing (Good e-Reader, Notebookcheck), not hands-on testing. What is still open is mostly international-market detail and the exact chip.

When you see “2 GB RAM” or “1,400 mAh” quoted around the web, those trace to press coverage of the China retail listing. The “on sale and heading overseas” framing that surrounded those reports in May no longer holds up.

Xteink S4 Price: How Much Does It Cost?

The Xteink S4 is reported on sale in China at CNY 339 (~$50). There is no international price because no international release is planned. That China figure comes from Good e-Reader and Notebookcheck coverage of the domestic retail listing. A ~$70 international figure circulated in May 2026 press coverage, but it was always an estimate, and it is moot now that Joshua Lowcock’s tracker reports no plan to sell the S4 outside China.

For a device you can actually price and buy today, the Xteink X3 is $69 (list $79) and the Xteink X4 Pro is $99 ($109 list). The original X4 is discontinued. The S4 does not ship internationally.

Xteink S4 vs X4 Pro: Which Should You Buy?

Buy the shipping Xteink X4 Pro unless you specifically need Android reading apps. The X4 Pro already ships an adjustable front light and a touchscreen, and you can order it internationally. The S4’s only real edge is Android, which means Kindle, Kobo, and Libby as apps by sideloading, and getting one means importing from China. The three-way spec grid lives in the X4 vs S4 vs X4 Pro comparison.

The X4 Pro runs XTOS, the same non-Android family as the X4 and X3. The S4 runs Android 11 (reported). Both add a front light and touch. The X4 Pro’s light is a confirmed adjustable warm/cool dual-tone. The S4’s is reported as adjustable. The X4 Pro launched July 21, 2026 at $99 ($109 list) with a first batch of 500 units. It drops USB-C for a pogo-pin connector and drops the bottom button row. Side buttons stay. The S4 reportedly keeps USB-C. Neither runs CrossPoint today. CrossPoint is ESP32 firmware, so it does not run on the Android S4, and it does not run on the X4 Pro yet, though Lowcock references an official XTEINK/CrossPoint partnership that could bring a port later. Box contents and upgrade advice are in the X4 Pro guide.

Get the X4 Pro that ships today · $99 or read the X4 vs S4 vs X4 Pro comparison first.

Is the Xteink S4 the Same as the X4 V2 Pro?

No. The Xteink S4 and the X4 V2 Pro are two different devices. The device the community called the “X4 V2 Pro” launched as the Xteink X4 Pro on July 21, 2026 at $99, runs Xteink’s non-Android XTOS, and ships internationally. The S4 runs Android and is China-only with no international release planned. They are easy to confuse because both add a front light and a touchscreen over the base X4, but only the X4 Pro keeps the flashable XTOS architecture, and only the S4 runs Android apps.

If you searched “xteink s4 v2” expecting one product, you were looking at two: the shipping X4 Pro, which you can buy today, and the S4, which is import-only. See the X4 vs S4 vs X4 Pro comparison for the full breakdown.

Will CrossPoint or Custom Firmware Run on the S4?

No. CrossPoint and every fork target the ESP32-C3 in the X3 and X4. The Android-based Xteink S4 is a different platform. CrossPoint, CrossInk, and Microreader, plus the smaller forks (AvesO3 for AO3 fanfiction, SUMI the offline-first X4 build, INX for X3 button-mapping) all run on the X3/X4 microcontroller. None run on the S4. If your reason for buying Xteink is flashing a custom build, the S4 is not your device. The shipping flashable model is an unlocked X3. The original X4 is discontinued.

The S4’s Android base is not bound by the X4’s ~380 KB of usable SRAM. Stock X4 firmware is limited to DRM-free EPUB and TXT, which is why the CrossPoint scene exists. The S4 can sideload ordinary reading apps: Kindle, Kobo, Libby, Moon+ Reader, ReadEra, or KOReader’s Android build. Press coverage points to no Google Play Store, so apps get sideloaded directly.

Custom firmware still matters on the shipping ESP32 models. In early May 2026, Liliputing reported that Xteink began blocking custom firmware on units bought from AliExpress, Taobao, and other Chinese domestic retailers, while stating that units from xteink.com or Amazon are unaffected. If flashing matters to you, buy the X3 or X4 Pro from xteink.com or Amazon. Our locked vs unlocked buying guide ranks sellers by risk and walks through the arrival-day test.

What Does Reddit Say About the Xteink S4?

Reddit’s consensus on the Xteink S4 is “interesting, but buy a shipping Xteink instead.” The r/ereader community still points newcomers at the X4 family, with the usual caveat that the missing front light and app limitation are real trade-offs. On r/xteinkereader, the S4 and X4 V2 Pro delayed-launch thread captures the mood: enthusiasm for Android, frustration at the slipping timeline.

The S4 draws interest for the same reason people buy any tiny Xteink: it pulls you off your phone. An Android reader that runs Kindle and adds a backlight lowers that friction. The risk commenters flag is the reverse. Full Android can drag the phone’s distractions back in. Whether the S4 stays a calm reading tool or becomes another notifications rectangle is a question only a shipping unit can answer.

Should You Wait for the S4 or Buy an X4 Today?

Decide from one question: are you here to read, or here to tinker? If you want the smaller button-only model that ships today, the X3 is $69; screen size, charging, and firmware are covered in the X3 vs X4 guide.

If you land in the “buy now” column, here is the practical move:

Steps:

1. Pick the shipping model. The X4 Pro if you need a front light and touch. The X3 if you want the smaller button-only reader. The original X4 is discontinued.
2. Buy from xteink.com or Amazon, not a grey-market reseller, so the firmware isn’t locked.
3. Confirm the unit is unlockable on arrival if custom firmware matters to you. Run the USB flasher before you settle in.
4. Read for a week first. Load a few DRM-free EPUBs, transfer them, and read before deciding whether you even want custom firmware.

Get the X3 · $69 at xteink.com or the X4 Pro at $99 for a front light and touch. The original X4 is discontinued.

If you land in the “wait” column, treat it as an open-ended wait. There is no official international listing, no FCC filing, and no plan for one. Don’t pre-order through a grey-market reseller to jump a line that may never form. Treat any future official international listing plus first independent reviews as the signal to act.

FAQ

Open questions a review unit will need to answer: battery life in real use (Android burns far more power than the ESP32, so a bigger cell mostly offsets overhead rather than extending read time); E-Ink refresh on Android (poorly tuned drivers feel laggy and ghosty, the biggest unknown for day-to-day feel); KOReader and Kindle rendering on this specific panel; and whether the bootloader is unlockable at all.

Where to Follow S4 Updates

• Official Xteink: product page will update if pre-orders open internationally; Xteink Note blog for official announcements
• Joshua Lowcock’s tracker: most detailed third-party tracker, updated when news breaks
• Good e-Reader: consistent Xteink coverage
• eReadersForum: community threads including the S4 Android pivot discussion
• r/ereader: community discussion; search “Xteink S4” for the latest threads
• This blog: hands-on coverage will appear here when a unit is available