I am looking for an ebook reader which can highlight text in various colors. Everything should get synced across iOS and desktop. By sync, I mean that highlights I make in a PDF on one device should be treated as an editable highlight on the other device, and not as a permanent part of the PDF. This is to be used for textbooks.

Currenty, I use Apple Books but it is very slow and I cannot sync it outside the Apple environment.

I am okay with free options, self hosted options and one time purchases. I am not so keen on subscriptions but will consider a cheap one.

Any help or advice is greatly appreciated.

I am looking for an ebook reader which can highlight text in various colors. Everything should get synced across iOS and desktop. By sync, I mean that highlights I make in a PDF on one device should be treated as an editable highlight on the other device, and not as a permanent part of the PDF. This is to be used for textbooks.

Currenty, I use Apple Books but it is very slow and I cannot sync it outside the Apple environment.

I am okay with free options, self hosted options and one time purchases. I am not so keen on subscriptions but will consider a cheap one.

Any help or advice is greatly appreciated.

Try Readest, open source, works on android, ios, linux, etc. Has syncing of books and highlights/notes. Still in active development though.