Take your thinking further.
Bring your notes, books, and questions. Explore ideas and make connections with Tito.
Paper shown: Yao et al., “Tree of Thoughts”, arXiv:2305.10601, CC BY 4.0. Adapted.
What's a Twinbook?
A Twinbook makes anything learnable.
Notes, books, videos, lectures, even a whole course. Turn it into a Twinbook and it comes with explanations, flashcards, quizzes, hints and Tito to keep you company. Then share it with one link, and anyone can learn it too.
For learners
Learn with a Twinbook
Make one from your own notes, books and lectures, or open one from a creator you trust.
For students, creators and educators
Share a Twinbook
Send yours to a classmate, or publish what you teach to all your learners under your own name.
Inside every Twinbook
Reads and reasons with full context.
Remembers and evolves over time.
Twinbook MCP server: in ChatGPT today, more coming soon.
Coming soon
All four steps live in one workspace. See the workspace ↓
Learn with Tito · The workspace
One workspace. New tools all the time.
The best place to read, take notes and study. And we keep adding tools.
- The best PDF reader for studyingHighlight, annotate and zoom, right on the page.
- The best note-taking for studyingType, handwrite or sketch, with figures and tables kept.
- Every tool knows your contextQuizzes, flashcards, Q&A and memory all work from what you're reading.
Chapters, progress and a Space Assistant that answers from all 11 chapters.
1 / 6Learn with Tito · The workspaces
Start a workspace in one tap. Grow it into a community.
Every Twinbook lives in a space you can share, run and grow.
1. Start learning in one tapTap Start learning, pick a subject and go. Name it later.
Explore courses from creators.
Learn with video, reading, practice, and AI support—all in one guided space.
A learner? Bring your own content|A creator? Publish a course
Why creators and learners choose Twinbook Network
Real understanding, not just summaries
Twinbook builds genuine comprehension instead of shallow recaps.
Powered by context and memory
Knowledge carries forward across every session, for every learner.
Your audience grows
Adaptive content meets each person their way — and reaches more of them.
The moment it clicks
“I was reviewing cardiac pharmacology and normally would have spent hours going back through lecture slides, textbook chapters, and old notes to connect everything. Twinbook compressed that into a personalized high-yield note — broad enough to see the whole pathway, but detailed enough to drill into mechanisms, exceptions, and weak spots. That's when I realized this wasn't just another AI summary. It was a better way to move through complex medical content.”
Medical student
Twinbook for Students
Research / Blog
How Twinbook is built
- What Is Learning Memory — and How Students Control It
- Building a General-Purpose Agentic Learning Pipeline
- Harness Engineering: How a Small Team Builds and Operates Twinbook
- How Twinbook Protects Student Learning DataFlagship
- Our Approach to AI Safety in Education
- How Twinbook Safely Processes Dense Learning Content
Trust & Security
For institutions, creators & reviewers
- Trust & Security overview
- Data retention & deletion
- HIPAA & PHI policy
- FERPA posture
- Subprocessors
- University readiness roadmap
- Responsible disclosure & incident response