Laptop

For a while I’ve been using Calibre 8.5.0+ds-1+deb13u1 in Debian/Trixie running KDE for reading ebooks on my laptop, it generally works well and has a large font size. The only downsides of it for that use are taking more RAM than I would prefer (about 780M RSS which seems a lot for a relatively simple task) and having separate windows for the list of books and reading an actual book without any options to just open the last book and not delay me.

I tried Arianna 25.04.0-1 in Debian/Trixie, it has a significantly smaller font size and doesn’t allow high contrast colors as the default is black on gray with the dark theme in KDE. It also only allows left and right arrows for moving through the book while Calibre uses up/down, left/right, or pgup/pgdn so whatever keys seem reasonable to you are going to work. The RSS was 762M which wasn’t great but wasn’t the real problem. Rumours of Arianna using less RAM than Calibre seem exaggerated.

Librem5

On my Librem5 phone with Plasma Mobile Calibre 8.5.0+ds-1+deb13u1 both the initial setup screen and the main screen for selecting a book to read don’t work in the width of portrait view on the phone. After putting it in landscape mode it worked, but I couldn’t touch on a book title to select it I had to touch on the number of the book at the left of the list box. But once it was loaded everything was fine. On the Librem5 Arianna 25.04.0-1 just worked fine, although only using left/right swipes to change pages instead of up/down was annoying.

Furilabs FLX1s

On my Furilabs FLX1s with phosh Arianna 25.04.0-1 and Calibre 8.16.2+ds+~0.10.5-3 both gave the same result of not displaying text or images from the book, I’m not sure if it’s phosh or some other aspect of the FLX1s configuration at fault.

PinePhonePro

On my PinePhonePro running Debian/Testing with Plasma Mobile Arianna 25.12.3-1 worked without any issue and up/down swipes worked. Calibre 9.5.0+ds+~0.10.5-1 had the initial screen work fine in portrait mode but the main screen was too wide and needed landscape. Also the issue of having to touch the number applied.

Conclusion

The problems I had were Arianna on a laptop, everything on the Furilabs FLX1s, and Calibre’s UI not being well adjusted for mobile devices.