BrainDen: Lecture Note Taker

Turn lectures, PDFs, photos, audio, text, and video links into structured notes, flashcards, quizzes, mind maps, and active-recall practice.

Turn lectures and study materials into a complete study system.

BrainDen transforms lectures, PDFs, photos, audio files, text, and video links into structured notes you can edit, connect, annotate, and review.

CAPTURE WITHOUT FALLING BEHIND • Record live lectures while BrainDen organizes the material • Upload audio files and PDFs • Capture textbooks, handwritten notes, or whiteboards • Import text and supported video links • Combine multiple sources inside one note

LEARN WITH ACTIVE RECALL • Generate flashcards from your own material • Review cards with spaced repetition • Create quizzes that reveal weak areas • Build mind maps to see how ideas connect

UNDERSTAND WITH FEYNMAN MODE Choose a topic and explain it in your own words. BrainDen gives focused feedback, identifies gaps, and helps you turn memorized facts into real understanding.

MAKE EVERY NOTE YOURS • Edit titles and note content • Refine selected sections with AI • Highlight important passages and add inline comments • Link related notes and source materials • Organize nested folders and read selected notes together • Export notes and folders as PDF, Markdown, text, or ZIP

ASK YOUR MATERIAL Chat with your notes when you need a simpler explanation, an example, or a step-by-step breakdown grounded in your study material.

STUDY YOUR WAY • Generate study materials in multiple languages • Continue reading recently opened notes offline • Use light or dark appearance • Share useful notes and folders

BrainDen is free to try. Some generation limits and advanced features require BrainDen Pro.

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