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Of all the PDF viewers on macOS, it seems only

and

support marginal comments, GDocs-style. I wonder why it's so rare.

(and I think _no_ ebook reader supports it… pretty wild)

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Thank you sir! Andy – check out

! Designed for marginal comments as you browse the web :)

Replying to

Ah, neat! Afraid I don't have an iPad right now, but will check it out if that changes.