A textbook written for you
Tell Sullivo what you want to learn. It finds out where you are starting from, then writes you an interactive textbook, one chapter at a time, pitched to you and adjusted by how you do.
How it works
- Where you stand. One question about your background, then an optional short test, with "I don't know this yet" and how sure you are on every answer. It measures your starting point rather than taking a guess.
- A course for you. A plan of chapters that starts at that point and ramps up gently, with examples drawn from your own work and goals.
- Chapters as you reach them. Each is written when you get to it: clear prose, interactive figures you can play with, quick checks along the way, and a short test at the end that shapes the next chapter.
Plans
| Plan | Price | What you get |
|---|---|---|
| Free | Free | 1 chapter, to see what Sullivo is |
| Pro | US$20 / month | 20 chapters every billing month |
| Max | US$100 / month | As many chapters as you can read, up to 10 in any 24 hours |
A chapter counts when it starts being written; if writing it fails, it is given back. Placement, the starting test and the course plan are always free. When a plan runs out you can top up with credits: US$1 buys 1 credit, and a chapter takes 1. Subscriptions renew monthly until you cancel, which you can do at any time from the app. Prices are in US dollars and charged in your currency where supported, taxes included where they apply.
Payments are processed by Dodo Payments, our merchant of record, which handles cards worldwide and UPI in India.
Start learningContact
Sullivo is run by [set CHARON_LEGAL_NAME], [set CHARON_LEGAL_ADDRESS]. Write to [set CHARON_CONTACT_EMAIL] for help, billing or anything else.