Hey Pierr0t,
It sounds like BookFusion is the solution you might be looking for.
-- iOS App -
https://apps.apple.com/us/app/bookfusion/id1141834096
-- Android App -
https://play.google.com/store/apps/d...android.reader
-- Web ( Windows, Linux and OSX) -
https://www.bookfusion.com/reading
PS: Founder at BookFusion. Please take it for a spin and let me know what you think. We are actively releasing updates monthly.