Any subject · any PDF · your first chapter free
Your personal educator, for anything.
Tell it what you want to learn, or hand it the PDF you are stuck on. It finds out what you already know, then teaches you from there, one chapter at a time.
Your first chapter is free. No card needed.
How it works
Tell it a topic
A subject, or a paragraph about your goals and background. Quantum mechanics, music theory, the fall of Byzantium.
It finds where you start
One placement question and an optional short test, with "I don't know" always allowed. It measures; it doesn't guess.
It writes your textbook
Chapter by chapter, with figures you can play with and checks as you read. What you miss is mended in the next chapter.
Bring the PDF you have to read.
A paper for work, a textbook chapter for class, a manual. Upload it and read it with a tutor at your side.
It checks you are ready
It reads the PDF first, works out what it takes for granted, and asks you a few short questions on exactly that.
It fills the gaps first
Anything you are missing, it teaches before you start, so the hard parts make sense when you reach them.
It reads along with you
Notes in the margin as you go, and you can ask about any passage without leaving the page.
As you use it, it gets better at teaching you.
It keeps a private memory of you as a learner: what you understand, where you slipped, how you like to be taught. Every chapter, check and question adds to it, and the next lesson starts from there.
What you know
Every idea you have shown you understand, across every subject. It never re-teaches what you have already got.
Where you slip
The mistakes you make and the misconceptions behind them, mended in the next chapter.
How you learn
More pictures or more worked examples, shorter or deeper, plain words or full rigour.
Private to you: nobody else sees it, and it is never part of research or shared.
Teach mode · invite only
Teach your own live classes.
Run a class from a link: your voice, your pen, your slides and the materials you prepared. Sullivo follows along, and when the class ends it becomes a textbook for your students, with figures, tests and Explain it back.
Ask to teach
We are opening Teach mode to a few teachers at a time, and we invite each one personally. Tell us about your teaching and we will write back.
Figures you can play with
Every chapter has figures drawn for it. These three are from real generated chapters; try the controls. Or read a whole chapter, figures and all, no account needed.
Any subject a book can teach
- Category theory
- Music theory
- The fall of Byzantium
- The electrical grid
- Linear algebra
- Quantum mechanics
- The Lean theorem prover
- Atomic orbitals
- Inference optimisation
- AI for business
Pricing
Free
$0
Your first chapter, to see if it suits you.
Pro
$20/mo
20 chapters a month. Most learners need no more.
Max
$100/mo
Up to 10 chapters a day, for learning fast.
Prices in US dollars, charged in your currency where supported. Cancel any time.
Questions
Is it free?
Your first chapter is free. After that, Pro is $20 a month and Max $100 a month.
What can I learn?
Almost anything that can be taught from a book: sciences, maths, history, music, programming, business.
How is it different from asking a chatbot?
A chatbot starts from nothing every time. This tests where you are before teaching, plans a whole course to a goal, and remembers what you got wrong so the next chapter fixes it.
Can I bring my own reading?
Yes: upload any PDF and it checks you are ready for it, fills any gaps first, and reads along with you, with notes in the margin.
What does it remember about me?
What you understand, what you got wrong, and how you like to learn. That memory is private to your account, and it is what lets each chapter fit you better than the last.
Is my data used for research?
Only if you choose. You can opt in to help improve how Sullivo teaches: your answers are then studied under a pseudonym, never your name, and you can stop at any time, which deletes that data. Sharing with other researchers is a separate choice. Your memory notes are never included.
Can I try it first?
Yes: read a whole example chapter, with its figures and checks, without an account. How it works shows every feature with a real example.
Do I need a card to start?
No. Make an account and your first chapter is free; you choose a plan only if you want more.
Start with one chapter, free.
Tell it what you want to learn. In a few minutes you are reading the first chapter of a course written for you.
Your first chapter is free. No card needed.