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RunJS vs StackBlitz: catalog facts
RunJS	StackBlitz
Free Free to download; no signup required according to the site.	Freemium Free to start in the browser, with paid plans for teams.
Windows, macOS, Linux	Web
Live evaluation as you type, no project setup Node.js and browser environments in one app	Runs Node.js in the browser with no local setup Environments boot in milliseconds
JavaScript and TypeScript-style scratch work only, not a full editor Source code is not published	Focused on JavaScript and web projects Depends on a modern browser with WebAssembly support
Downloadable app	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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