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