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ActiveBook
WebDev Workbench
Free starter
WebDev Workbench
HTML/CSS/JS by the chapter, runnable in place.
By ActiveBook Admin
Free
About this ActiveBook
Every concept is a live mini-app. Edit the markup, watch the render. Inspect events. Break flexbox until it makes sense. A console that explains its errors.
What's inside
6 interactive tools
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Code sandbox
Edit & run code in-page — no setup.
Interactive REPL
Line-by-line evaluation with full history.
API playground
Try real APIs with editable requests.
Video lessons
Embedded video, transcript-synced.
Discussion threads
Per-chapter community discussion.
AI tutor
Ask questions in context, get answers grounded in the book.
Why ActiveBooks
- ✓ Everything runs right in your browser — no setup, no install
- ✓ Lifetime updates as the author adds new chapters and tools
- ✓ Your state stays — bookmarks, parameters, notes