I use BookFusion. It’s a paid service but syncs the library and progress across platforms. Integrated with Calibre too, which I saw you mentioned you use in a different comment. Works great for me, but good luck finding something that works for you.
DandalfTheWhite
joined 1 year ago
BookFusion is cool. It also has a calibre plugin so you can upload directly to it if you use Calibre. No idea how they are privacy wise but the sync is perfect across multiple devices and systems. It is not open source but it does what you want and has paid levels. Here’s the link: https://www.bookfusion.com/
Oh,I think you’re right. They have their Calibre plug-in which is open source I think but I think in my head I conflated that with the whole app. My bad.