App for studying / reading textbook pdfs

[u/SheSaidNo-]

And no, im not talking about a pdf reader with a fancy UI, although I am talking AI. Is there any app out there that i can conveniently pull out an AI on the sidebar and ask it questions based on the specific paragraph / context i am at? instead of copy pasting it into claude or chat.

not asking for another tutor / flash cards app - ive seen them. anyone get me? thanks