Good to know, thanks!

Thanks, pinchflat might help!

Thanks. Is there a self-hosting PWA for Grayjay?

Thank you for clarifying

A web browser which puts everything in a cache, so you can continue to read, if offline.

Ceno does that but it's for mobile

Good to know, I appreciate you taking the time to clarify it to me, thanks

Very interesting, thank you for clarifying and the other informations, i might look if I can find an used Kobo h2o

Thanks, I'll try it

Thank you for taking the time to share it with me, I am a bit familiar with it, I used it to convert formats before but I ended up using shell/python scripts in the end to be more sttaightforward converting files, I will look more into it as soon as I get an E ink to try it out on book transfers, I have bought books outside Amazon and it'd be very helpful for me to have Calibre then

It appears so to really be discontinued but it'd not be a dealbreaker for me, I hate constant updates (i know security updates are for good but still annoying, i dont know if E inks do security updates like usually on mobile/PC though, do they?), interesting about the book transfer, is it natively supported by the device or do you use something like Calibre (which would be fine too)? Waterproof could also not be a dealbreaker for me I guess I could buy a case for it? I certainly wouldn't stand in the middle of a rain to read

Is it safe as PDF (i know PDF can be virus ridden by usually embedding the virus in specific parts of the PDF layers or so I heard a while ago, which I usually am careful what PDF i open) or more/less?

Maybe I misunderstood but what OP means (that I understood) are softwares that you don't need to rely on internet connection to use it, probably ones you need 0 need at all of internet connection but I assume OP may also be accepting suggestion of ones you can open while without internet connection but also be able to download data for offline use (maybe like Language Transfer).

I never truly understood the use of epubs to be honest, I usually convert them to PDF. Also I didn't know you could do crossword puzzles on E ink that does sound very nice, so I assume you could do Sudoku as well? I have heard of reMarkable and it sounds perfect for me but its not within my reach atm unfortunately. I never heard of Boox so I will check it out. Is Kobo durable too?