23Brain
Productivity
Only for iPhone
Free · In-App Purchases
iPhone
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.
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
- Add "review 23Brain on app store" dialog
- Bug fixes related to quiz heatmap calendar
- Optimize onboarding flow
The developer, Felix Seip, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 79.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Ultra (Monthly) 29,99 €
- Ultra (Yearly) 299,99 €
- Pro (Yearly) 119,99 €
- Pro (Monthly) 14,99 €
- Provider
Felix Seip
- Felix Seip has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
Weilburger Straße 16
60326 Frankfurt am Main
Germany - Phone Number
+49 17643268265 - Email
felix@seip.consulting
- Copyright
- © 23Brain