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Do you know of a way to take notes _on_ a ePub book? I’d love to buy a new iPad just for this if there was a way to do it. As far as I have tried, Apple Books, or Kindle don’t allow markup on ePub books.

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I mostly use Apple Books (formerly iBooks) for this. Can highlight, add text notes, and bookmark pages. Syncs those and reading progress across devices. Also somewhat works for PDF books. Sometimes the sync screws up but mostly works.

Google Books can also do this and notes go to an associated Google Doc.

I use Lithium in Android. Has this feature.

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