> There are no physical buttons on the front

That's too bad. For whatever reason I find swipe gestures on e-ink annoying. I currently use a Kobo Clara BW and miss dedicated page-turning buttons.

I see they're offering the print files for the case, maybe there will be some pins on the ESP32 exposed somewhere for adding buttons

Looks nice. Personally I don't know I can go back to 220ppi, but if I did I would definitely pay for the touchscreen and light over the X4!

Maybe you already have this, but I'd encourage you to put a "pure" reading mode in there, with no status bars top or bottom. That would probably allow for an extra line.

I wonder if there's also room in the case spec to slot in a magnet here or there. Could make for some creative solutions for covers or stands. Personally I use a Clara BW with a folding cover-stand and it's incredibly convenient.

Looks like it's a well thought project. I might consider it to replace my old Kobo. There are only two things I don't see in the description:

1. A dictionary

2. A flash card creation functionality

I really liked their comparison matrix, it's honest about what it does and what it doesn't do. I'll probably go with Kobo + Koreader when my current ereader gives up the ghost, but given that 4" ereaders seem to be all the rage these days, I wish them success.

Nice. I wish it had a bigger screen and buttons, though. Kindle Oasis was the sweet spot for me.

> Open Book Touch is the device I’ve been trying to build for six years: a small, beautiful, completely open source e-book reader that does one thing and does it well

What makes this beautiful?