The Xteink X4 E-Ink Reader
73 points
2 hours ago
| 22 comments
| blog.omgmog.net
| HN
sieve
1 hour ago
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Got the X4. Put CrossPoint on it. Works like a charm. The http server accessible over wifi makes transferring books extremely simple. (Shame on the Kindle for locking everything down.) This is proof-of-concept that a microcontroller is more than enough for something like an e-reader.

I have a Kindle and a Kobo. They are sturdy devices. But the X4 is the one that is a genuine e-reader. Would not get it as my one and only e-reader though as you tend to miss the size and backlight of the larger ones.

What would I want from future iterations?

- backlight even if it compromises on battery a bit

- a bit more DPI

Everything else is good enough.

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kstrauser
47 minutes ago
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I'm with you on every bit. I love my Kobo Libra 2 and it lives on my nightstand table. It's an excellent reader. The X4 with CrossPoint is an alright reader, but I've been chewing through books on my morning commute because it fits in my jacket pocket and I can have it out on the train without bumping into other people.

It's not the best reader I own, but it's the best reader I have on me at any given moment when I'm not laying in bed.

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sieve
24 minutes ago
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> It's not the best reader I own, but it's the best reader I have on me at any given moment

This. The form factor is almost the right one for an e-reader. The battery lasts for weeks. It is so open that you could probably write your own firmware for it based on CrossPoint or similar for your own needs.

Needs some iterative development while ruthlessly culling requests for random features.

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criddell
38 minutes ago
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Does your reading position sync up between the two devices?
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crtasm
5 minutes ago
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If you install koreader on the kobo, crosspoint on the x4 and create a free koreader sync account (or host your own sync sever): yes - but on the x4 you need to manually trigger syncs

Alternatively if you wish to stick with the stock Kobo reader app it is possible to sync via a https://grimmory.org/ instance

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ihowlatthemoon
22 minutes ago
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Not the commenter you were replying to, but I have both a Kindle and a X4. No, it does not, but searching for a unique enough phrase (just two or three words) on the current page gets you there fast enough.
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0cf8612b2e1e
6 minutes ago
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As someone who also juggles multiple readers, I find it easier to have a different book per device. Otherwise I would waste too much time trying to sync between the two.
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pluralmonad
39 minutes ago
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Not being lighted is what has kept me from trying it. If they do add lighting I hope it is a front light and not a back light. Hard to beat a front lit e-ink display for reading. Bonus points for warmth settings.
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HumblyTossed
46 minutes ago
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All of this. It's a solid device. I like it. It won't replace my Kobo, but it has it's place in my tech lineup.

Will buy the next one if it has a light.

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criddell
23 minutes ago
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I've looked at this device and I wonder how good the layout engine is. Screenshots never show text with any hyphenation going on which makes me wonder if it even supports hyphenation.

One of the images on the Amazon page for the reader has somebody holding one beside their laptop and if you look at the screen, it looks terrible. There are even words jammed together ("would be most suitable forthe job").

I love that it has physical buttons though. My reader is the Kindle Oasis and the buttons are one of my favorite features of the device. The Oasis layout engine and typography are both pretty good and I wonder if the X4 would end up feeling like a big downgrade.

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bouk
17 minutes ago
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The alternative firmwares give you a lot more options in this, stock is OK in layout
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lisnake
18 minutes ago
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Custom firmwares support hyphenation
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rcarmo
17 minutes ago
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I got one last April, and love it: https://taoofmac.com/space/reviews/2026/04/04/1800

I also built two quick hacks for it that people might like:

- https://github.com/rcarmo/bun-readlater-epub

- https://github.com/rcarmo/bun-opds-server

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broabprobe
22 minutes ago
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I love the X3, light enough I can carry it around without noticing it. Battery lasts forever. I don't feel the need for a backlight at all, I love how simple this is.

I know people favor the X4 for the usb-c, and I'm all for universal charging cables. But in my experience the usb port is often the first component to fail in something like this. And that seems super annoying to replace. The pogo pins on the other hand are unlikely to fail. And the cable is not proprietary, you can get compatible cables on Amazon/etc.

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miohtama
1 hour ago
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For those who can afford it, I can recommend the Boox Note for the ebook reader. It comes with full Android, so you are not limited to books but can read news, Hacker News, and other doomscrolling that fills the Internet.

In a pinch, you can also connect it to a Bluetooth keyboard and use it as a development terminal. SSH terminal looks gorgeous on e-ink.

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BeetleB
1 hour ago
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> It comes with full Android, so you are not limited to books but can read news, Hacker News, and other doomscrolling that fills the Internet.

That sounds like an anti-feature. When I first bought an ereader over 15 years ago, I intentionally chose one that didn't support Wifi for this very reason. I want it primarily for reading documents.

But then again, I guess Boox is meant more to be a tablet than an ereader.

Also, genuinely curious - does having Android reduce the time between recharges? As an example, I read a whole book over 7 days, and didn't need to charge my Kobo (and modern Kobo battery life is not great).

I want Kobo to release an 8" color, but don't know if they ever will. I was considering Boox as an alternative, but I worry about battery life and Android. I wonder if my worry is misplaced.

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criddell
36 minutes ago
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A problem with Boox that some here care about is their non-compliance with the GPL. Their devices run modified GPL software and they have (AFAIK) refused to release their modifications.
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dewey
1 hour ago
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Sounds like the opposite of what I want for my ebook reader.
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imzadi
1 hour ago
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If you are looking for a more affordable option, I have a Musnap Ocean C. It's a little bare bones, but still pretty good. It's a color e-ink display and you can get an optional pen that lets you take notes. I only use it for books and documents, though. It's the best option under $300 that I have found if you want something that is color and can take hand written notes.
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koziserek
1 hour ago
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the point of having an e-ink reader (at least for me and anybody I know who actively use such device), is to read things, so keeping doomscrolling options is *not* an advantage..
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aanet
31 minutes ago
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I've been eyeing the Xteink Reader but cannot decide between the X4 (4.7" diag) and X3 (3.7" diag).

FWIW, the X3 requires a pogo pin cable, while the X4 requires a standard USB-C.

Anybody got any recommendations?

Thanks!

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ihowlatthemoon
19 minutes ago
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Go for the X4. Neither supports USB file transfer, so having USB-C charging is convenient without additional things to worry about. Bigger screen is also better if you're a fast reader. The faster you read, the more your reading speed is limited by the page turn speed.
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cbushko
21 minutes ago
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I picked the X4 over X3 because the usb-c is convenient for charging (which you barely need to do)

I love it and use it every day.

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5555624
5 minutes ago
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The X4. I always have a USB-C cable handy; so, i can charge it in the bedroom, at y desk, etc.
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ApolloFortyNine
1 hour ago
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I got one, it's pretty cool that it's small enough to just magnet to the back of your phone. If your someone who needs to use a large font on their ereader to read its certainly not for you, but the screen size is good enough for regular sized text.

It's also cool that it's chip is just an ESP32.

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WillAdams
41 minutes ago
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I would like to see a phone case which this inserts into --- bonus points if there's a way to use it as a status display for the phone for use in bright/direct sunlight.
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naravara
24 minutes ago
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The obvious innovation is to just make the back of the phone case an eInk display. No need for all the bulk when you can merely have an app on your phone that controls the case-display and the phone can output whatever reader app you want to it like a companion/IoT device.

Or it can be a little bit bulkier and just be a dedicated ereader that is shaped like a phone case. Either way works.

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senorcrab
54 minutes ago
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I've been using it for about 6 months. Very, very good - especially paired with anna's archive.

IT IS VERY FRAGILE! The eink screen on my first broke while in my backpack. The company is generous, I bought a new one and they gave 35% off and included all accessories (reading light, case, extra protectors). Highly recommend.

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dfee
25 minutes ago
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i bought a pocketbook era lite recently, and it's a bit too locked down for my tastes - though usable. i kinda just want a dumb appliance. actually, i want a linux appliance. this probably sounds very "not productized" to a PM, but 99% of what's on there i don't want: a book store, games, etc.

i wish there was just an SDK for building apps (i'll vibe code towards a great epub experience, i'm fine with that). and, i'm fine plugging it in via USB or even SCPing files over wifi. but, it sends my reading progress to a server every time i use it which is highly annoying and concerning. however, the form factor is sufficient.

i guess i was hoping it'd be more aligned with steam's direction with their steam machine.

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camel-cdr
21 minutes ago
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> i wish there was just an SDK for building apps (i'll vibe code towards a great epub experience, i'm fine with that)

That seems to be what crosspoint-reader is: https://github.com/crosspoint-reader/crosspoint-reader

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zabi_rauf
42 minutes ago
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Love my X4. Shameless plug, I also built an iOS/Android app to manage books and also send web articles over to Crosspoint

https://crosspointsync.com/

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ihowlatthemoon
18 minutes ago
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Thank you. I'm not the biggest fan of the Crosspoint web interface, so I'll definitely give this a try.
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somesortofthing
1 hour ago
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I got the X4 and liked it enough that I used it a ton even though it turned out to be too big to Magsafe onto my phone. In fact, I liked it enough that I also got the X3 on sale so I can use it the way I originally intended to use the X4.
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NDlurker
1 hour ago
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I've had the X3 for a month and I love it. It's so small I forget it's in my pocket and have almost washed it a couple times. I'm working on custom firmware for it, so I ordered an X4 when they had the 20% off sale to test on there too.
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timw4mail
29 minutes ago
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As a crazy person with both, I have mixed feelings between them.

In favor of the X3:

- Crisper text

- Whiter display

- Slightly better battery life

- Top-mounted power button (subjective)

In favor of the X4:

- Larger display

- Plain USB-C charging

- Slightly better custom firmware support

- Backward and forward button on the same side (subjective)

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automathematics
43 minutes ago
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link the custom firmware!
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dinkleberg
1 hour ago
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I got the X4 a few weeks back and installed https://github.com/uxjulia/CrossInk and it has been a dream.
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thenthenthen
1 hour ago
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Hijacking … i have some random e-ink displays (from a bought product)… there seem to be 6 lines to the mcu (or 7, havent measured). Any 2026 tips on approaches to reverse engineer this to run on an arbitrary hobby mcu like esp32? Oh the mcu seems to be a WinnerMicro W100 Series MCU (arm m3)
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dmitrygr
56 minutes ago
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there are 4 or 5 command sets, you can safely try them all. for that few wires, it'll be spi
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hxii
57 minutes ago
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I’ve been looking at these for a while, hoping the custom firmwares for it will become more popular, as I was considering getting this for my six-year-old.

The disabled usb is certainly a bummer. I wonder how they disabled it though – is there a hardware difference?

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cbushko
19 minutes ago
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Crosspoint is very popular and very easy to flash onto the device.

Locking and preventing flashing of firmware only happened in China.

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shorsher
1 hour ago
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As someone who has resisted buying an e-reader for years because I "prefer physical books", I finally purchased a Kobo Clara BW and love it. Even though I usually only read one book at a time, having my whole library in a small form factor is really wonderful.
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nosioptar
1 hour ago
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The no USB flashing doesn't appear to be the case if you get it straight from OEM. It is a bit pricier than amazon.

https://www.xteink.com/products/xteink-x4

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dgrabla
1 hour ago
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I love this thing and I use it a lot more than my kindle and my kobo (with koreader). I really like the form factor and the fact that goes out of sleep almost instantly and goes to sleep equally as fast. It seeps battery. It is perfect the way it is.
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crimsdings
59 minutes ago
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Have the X4, the size is perfect - I always have it in my pocket and can read a view pages whenever I am waiting for something. Reduced my phone usage / doom scrolling nonsense with it. Best 50€ spent in a long time.
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WithinReason
1 hour ago
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camel-cdr
1 hour ago
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I skimmed over the project a bit. It seems quite ambitious to aim to reimplement epub, considering that means supporting HTML, CSS, SVG and JavaScript.

Is there a ebook format that isn't just build arround the concept of a webbrowser?

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lisnake
16 minutes ago
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HTML and CSS is enough for 99% percent of epubs, and that's the only subset of epub standards that Crosspoint tries to support
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camel-cdr
9 minutes ago
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Isn't HTML and CSS already a huge surface to support, unless you are happy with a subset?
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timw4mail
23 minutes ago
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While I agree in terms of modern browser expectations (and books absolutely should not need JavaScript), I think books in HTML makes a lot of sense. HTML was meant for sharing text documents, after all.
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sieve
54 minutes ago
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epub is overkill for a vast majority of books.

A format that only supported

- headings

- paragraphs

- emphasis (bold/italics)

- bullets

- inline images

is good enough. A simple container with a TOC pointing to text blocks/files within it that can be processed very cheaply.

Unfortunately, with something like epub, you lose all the simplicity because you want to support every single feature even if rarely used.

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kandros
51 minutes ago
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been using on the back of my phone for a few months, my most satisfying hardware purchase in a long time
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automathematics
44 minutes ago
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what phone does it fit on? I have the X3 coming today for this very reason. The x4 is just too big and the magnets misplaced to fit on any phone I own
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galleywest200
1 hour ago
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I love my X4. I throw it in my backpack or pocket when I take the dog to the park and read a few pages when we sit in the shade.
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