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StackBlitz vs CodePen: catalog facts
StackBlitz	CodePen
Freemium Free to start in the browser, with paid plans for teams.	Freemium Free to use, with paid plans for additional features.
Web	Web
Runs Node.js in the browser with no local setup Environments boot in milliseconds	Live preview of HTML, CSS and JavaScript as you type Nothing to install
Focused on JavaScript and web projects Depends on a modern browser with WebAssembly support	Needs an internet connection Suited to small demos rather than full projects
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.