Your second and third brain for smarter learning
23Brain helps you collect, summarize, and retain knowledge from everything you read, watch, or listen to — powered by AI. Build a personal learning system that grows with you.

How it works
• Summarize any content automatically
Save links, videos, or PDFs — 23Brain generates concise, AI-powered summaries.

• Learn on the go
Listen to audio summaries anywhere and make use of your time more efficiently.

• Organize with collaborative collections
Group related topics, share insights, or explore curated watchlists.

• Retain knowledge with AI-generated quizzes
Reinforce what you’ve learned through personalized quizzes that adapt to your interests.

• Chat with your second brain
Ask questions, connect ideas, and reflect on what you’ve learned through intelligent conversations.

• Track your progress
Stay motivated with streaks, insights, and detailed learning statistics.

Why 23Brain
Unlike traditional note-taking tools, 23Brain helps you remember more and understand faster — not just store information. It’s your personal AI companion for continuous learning and long-term growth.

Key features
• AI summaries for articles, videos, and podcasts
• Audio playback for summaries
• Personalized quizzes and progress insights
• Collaborative collections and watchlists
• Multi-language support for 12 languages including English, German, and Hindi
• Light and Dark Mode

Start building your second brain today.
Turn what you learn into knowledge that lasts.