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JSFiddle vs RunJS: catalog facts
JSFiddle	RunJS
Freemium Free with ads; a PRO subscription removes ads and adds private fiddles and collections.	Free Free to download; no signup required according to the site.
Web	Windows, macOS, Linux
Nothing to install; runs in the browser Shareable links for snippets and demos	Live evaluation as you type, no project setup Node.js and browser environments in one app
Ads in the editor on the free plan Private fiddles and the console require PRO	JavaScript and TypeScript-style scratch work only, not a full editor Source code is not published
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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