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It is maddeningly impossible to get an ereader with all three of these features: b&w screen for maximum crispness; physical buttons for reliable page turns; modern processor for speed.
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Boox Go 7 - B&W version.

It runs Android. It's a Chinese company and comes with a bunch of pre-installed apps, but I just blocked its abilities to phone home and use Koreader. It's been great for me

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Boox Go 7 BW?

https://goodereader.com/blog/product/onyx-boox-go-7-bw "The Onyx Boox Go 7 is a dedicated e-book reader with a black and white e-paper display. This device has the same specifications and software as the Go 7 Color Gen 2, except that this model doesn’t have a Kaleido 3; instead, it uses the latest generation Carta 1300 e-paper panel, which increases responsiveness. The key selling points of this model are the physical page-turn buttons and Google Android 13, as well as full access to the Play Store. For those of you who want an e-reader that doesn’t lock you into a specific ecosystem, this deserves a look."

(slower by 2 minutes...)

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I'm happy with my Kobo Clara Colour. As far as the specs go, both are 300 PPI when displaying black and white. I took a picture of my screen from as close as my phone would allow - the lens was basically touching the e-reader [1]. My eyes can't really focus at this distance anyway, so I can't complain. I don't use the colour screen much, but seeing the book covers in colour is fun for me.

[1] https://imgur.com/a/cszqi0F

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I use a bw Boox device, a colleague has the colour version of the same device. The colour version does not show text more blurry, rather, the contrast is significantly lower. I personally prefer the bw device.
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Yes. I had color Kobo, left it in the airport lounge, and bought BW one as a replacement. It is much better.
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I compared. On the color version, the text seems to have a slightly fine mesh or rippled texture. There's no huge difference, but I prefer the black-and-white version
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