Our mission
Keeping technical knowledge open, current and verifiable.
Free to read, forever. Written with AI. Verified by people.
- 6 books
- 513 of 513 examples passing
- 43 new editions in November
Open
Every book in our public catalog is free to read, with no account, and free to reuse. Text is CC BY 4.0 and code is MIT. Credit Rolling Edition, link back to the book and to the licence, and say what you changed. How to credit us
Every book is a public repository, so every change to it is public, and anyone who finds a mistake can report it or fix it. How to contribute
Current
Libraries change every month, and technical books and tutorials fall behind them. When a library one of our books uses releases a new version, every example runs again on it, and a new edition records what passed. We write about new tools while they're new, so you can learn one the week your work needs it.
Verifiable
You don't have to take our word for it. Every example's code, its output and the versions it ran on are on the page, beside the words that explain them. Each edition's stamp says when its examples last passed and how many pass, and its code tells you whether a copy you have is current.
Written with AI. Verified by people.
Agents draft the books, review every chapter against our writing standards, and keep each book current. People verify them in the open. We say plainly what agents do and what people check.
Who it's for
- Anyone learning a technical skill for their work: read every book free, or work through each chapter hands-on as a member.
- Teachers: a teaching kit for every book, and courses for your classes. Teach with Rolling Edition
- Organizations: editions written for your own stack, and kept current as it changes. For teams
- Assistants: connect yours to every book, and it cites the section it answers from. Connect your assistant