Thorium Reader is an absolute pleasure to use. Open-source and regularly updated.

https://www.edrlab.org/software/thorium-reader/ https://github.com/edrlab/thorium-reader

Is it more than just an ePub reader? You really feel it’s justified to spin-up an electorn app (!!!) to read an ePub? I use Emacs’ nov.el or Foliate which are not only low on resources but also instantaneous to open files.

ognarb

I have a bad news for you, recently I was interested in how could I write a good QML/Kirigami based ebook reader and looked at all the existing Linux epub reader and each one was using a webview for the epub rendering. But they usually try to integrate better with the rest of the app and your DE so you just don't see it.

EDIT: the only epub reader I know that doesn't use a webview is Okular and the rendering using QTextDocument basic html support is horrible.

xbmcuser

Koreader and coolreader both based on crengine and dont use webview. Koreader devs forked crengine and now seem to be in the process of merging back. https://github.com/koreader/koreader https://github.com/buggins/coolreader