One thing first.

• We record what you do here, keystroke by keystroke: every key you press in the editor and when, your edits and pastes, the pages you open, your runs and their results, and when you switch away (never to what). It's sent to our servers without your name. That's the product.
• We may publish insights from it, never your records or your code. Rather not count? Go stealth any time in settings.
• Nobody else sees your results, and we don't sell your personal data.
• Code you write stays yours; you give us a licence to use it to run the product and learn from it.

The full Terms and Privacy Notice are short and written for humans. Your code and progress are saved in this browser: there is no device sync or recovery from uploads, and clearing browser storage clears them.