I use hypothesis (https://web.hypothes.is/ https://web.hypothes.is/) to annotate/bookmark/comment anything on the web. It has a well documented api so you might

I use hypothesis (https://web.hypothes.is/ https://web.hypothes.is/) to annotate/bookmark/comment anything on the web. It has a well documented api so you might be able to squeeze some other features out of it quite easily. The only issue I have with it right now is that it doesn't archive pages. I've been looking into ways to integrate existing page snapshotting tools with it but haven't settled on anything yet.