Have you tried foliate? Their embedded reader works quite well for me.
replyHmm, Sumatra PDF perhaps?
replyAs someone who loves FoxIt reader, I'm building https://merrilin.ai to be the best damned ebook reader out there, to support PDF and epub. FoxIt's annotation system is one of the best I've experienced and I want to design one that is just as good if not better.
replyBuilding a robust annotation system for both PDF and EPUB is a tough technical challenge, but definitely needed.
I've been working in a similar space and recently open-sourced it. It's a local-first 3D library for organizing and reading EPUBs and PDFs directly in the browser.
It's called KoreShelf on Github
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