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RunJS vs JSFiddle: catalog facts
RunJS	JSFiddle
Free Free to download; no signup required according to the site.	Freemium Free with ads; a PRO subscription removes ads and adds private fiddles and collections.
Windows, macOS, Linux	Web
Live evaluation as you type, no project setup Node.js and browser environments in one app	Nothing to install; runs in the browser Shareable links for snippets and demos
JavaScript and TypeScript-style scratch work only, not a full editor Source code is not published	Ads in the editor on the free plan Private fiddles and the console require PRO
Downloadable app	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Needs internet
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.