[1] https://f-droid.org/en/packages/org.koreader.launcher.fdroid...
Once your used to it, the controls are a lot better than stock kindle as well imo.
If you want a cross platform option that's pretty good across Android/iOS/Mac/Windows/Linux, Readest[1] Is another great option. It supports syncing a library of ebooks and is licensed under the AGPL[2].
[1]: https://readest.com/
Supposedly it can interface with various sync providers, but I've not tried this myself. The rendering is lovely.
For example, my usage now only ever goes like this:
1- Open Librera. Presented with a scrollable page of all book covers.
2- Scroll down to the epub I'm currently reading. Tap it once.
3- Resumes the book where I left off, with previous view settings. In my case full screen text with zero UI (tap once to hide the UI).
Unfortunately I have had to go proprietary and use readera premium, which works fine for epubs.
The only options are stripping the DRM from kobo books or piracy, last I checked.
Piracy and stripping DRMs though definitely work.
You can thank me later (in 20 years).