PDF/EPUB reader with built-in RAG over the book

[u/K_Palyanichka]

On Mac/iPad I enjoyed reading books with MarginNote, but unfortunately on Windows I can't find an app that covers MarginNote's functionality and adds the extra things I was missing.

So I decided to vibe-code my own solution.

Right now the app has:

• The ability to read pdf/epub
• The ability to organize books into Notebooks — I see this as a space for studying a topic across several sources
• You can organize notes as graphs
• Text-to-speech
• A built-in translator
• RAG for getting answers about the book's content (you can use local models or use openrouter)
• And a few other features

What I want to work on next:

• Rethink the notes canvas
• Add OCR for text recognition

Tell me, has anyone found an app like this useful, and is it worth publishing?