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RunJS vs Notepad.exe: catalog facts
RunJS	Notepad.exe
Free Free to download; no signup required according to the site.	Free Free to download and use without an account.
Windows, macOS, Linux	macOS
Live evaluation as you type, no project setup Node.js and browser environments in one app	Runs snippets in five languages without a project Can test code on Linux from the Mac
JavaScript and TypeScript-style scratch work only, not a full editor Source code is not published	Requires macOS 15 or later Not a Windows Notepad clone despite the name
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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.