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RunJS vs Playhouse: catalog facts
RunJS	Playhouse
Free Free to download; no signup required according to the site.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Linux	Linux
Live evaluation as you type, no project setup Node.js and browser environments in one app	Local alternative to online web playgrounds Simple setup through Flathub
JavaScript and TypeScript-style scratch work only, not a full editor Source code is not published	Linux only Small project with a short commit history
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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