BrainDen

BrainDen turns your lectures, PDFs, videos, audio, and photos into AI-generated notes, flashcards, quizzes, and mind maps, with spaced repetition and a Feynman study mode. Free to start with no card required.

Best for: Turning lectures into a full study kit

What you get

• Free plan starts with no card: a small number of recordings (~3) plus AI notes, flashcards, quizzes, and mind maps
• Pro is $19.99/mo, $49.99 for 6 months, or $99.99/yr per the US App Store listing; web/subscription prices may differ, so check their site
• No time-limited free trial and no student/education discount were found; the free tier is the main student value
• Official site is brainden.app (app at learn.brainden.app) — 'brainden.ai' is not the real domain

How students use it

• Record a lecture and get notes, flashcards, and a quiz from one upload
• Use Feynman mode: explain the concept back and get gaps pointed out
• Turn a YouTube video into a mind map before the exam