Read deeper. A private AI reading app for EPUB & PDF.
Vidira is a reading app for EPUB and PDF books. Highlight any passage and tap Dig deeper for an instant, plain-language explanation from an AI tutor. Ask questions about a whole book, get chapter summaries, and test your understanding with quizzes. Your library, reading position, notes, and highlights stay private on your device - reading works fully offline, and only the passages you choose are ever sent for an AI answer.
Select text and get a clear explanation in context, without leaving the page.
Tap a diagram or photo and Vidira explains what it shows.
Chat about a whole book and get an instant chapter recap.
Adaptive chapter quizzes that show what you have mastered.
Your books and notes live on your device. No ads, no tracking.
A clean library with progress, collections, and a smart table of contents.