23Brain

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.