Master coding with real feedback
Learn JavaScript, Python, Go and more through hands-on exercises. Auto-tests verify your logic. AI analyzes your code and gives you a score with actionable feedback.
Pick your language, start coding
All courses are built around a specific language. More languages are added regularly — the list grows with the platform.
Real projects in the browser
Work in live sandboxes with hot reload, tests, and preview — the same tooling you use on real products.
Everything you need to level up
A complete learning loop — read, code, test, get AI feedback, repeat.
AI Code Review
Submit your solution and get an instant AI analysis — what's good, what to improve, and a score based on predefined criteria stored per task.
Auto-tests
Every task has automated tests. Run them before submitting — submit is only unlocked when all tests pass.
Instant execution
Run your code in a sandboxed environment directly in the browser. See stdout/stderr results immediately.
Structured curriculum
Courses are broken into topics with reading material and hands-on tasks. Progress is tracked automatically.
Multi-language
Switch between languages seamlessly. The platform is designed to grow — new languages can be added without code changes.
Three steps to better code
Pick a course
Browse courses by language. Each course has structured topics with reading material and coding tasks.
Solve tasks
Write code in the built-in editor. Run it, fix it, then run auto-tests until everything passes.
Get AI feedback
Submit your passing solution. AI reviews your code, highlights strengths, suggests improvements, and assigns a score.