Professional Foundations · Admissions

Free environments

Isolated, contained practice environments you can open in a few clicks. No installs, no credit card, nothing to configure.

Open the code sandboxBrowse guided labs instead
Environments
3
Run in your browser
1
Always
Free
Runs in your browserCode SandboxWrite and run HTML, CSS, JavaScript, and Python instantly, with a live preview and console.
Third-party embedJupyter SandboxA full Jupyter Lab notebook for Python and data work, powered by JupyterLite.
Third-party embedSQL SandboxAn interactive SQL environment for practicing queries and schema design, via DB Fiddle.

These sandboxes run in your browser, so there's no server usage to report. Your device is the only limit.

New: Guided Practice

Prefer step-by-step? Practice Tracks give you exercises, checks, and XP.

HTML, CSS, JavaScript, Python, and data analysis, one guided exercise at a time.

Start practicing