No. 19 of 58 ·Code Playground Software

RunJS

Windows · Mac · Linux

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Freedom report

Two barsScore 5.5

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely3 of 6 device platforms
DocumentedPlans, terms and facts published

RunJS is ranked #19 of 58 in code playground software on Freedom251. It runs on Linux, macOS, Windows.

RunJS plans and pricing

All plans

Perpetual License Not published Pay once; optional annual renewal for continued updates macOS, Windows, Linux · 2 devices · updates for 1 year · 30-day money-back guarantee runjs.app · 4 Oct 2026

Lifetime License Not published Pay once macOS, Windows, Linux · 2 devices · updates forever, including major releases · 30-day money-back guarantee runjs.app · 4 Oct 2026

Compared on code playground software

Runtime scope: full-stack

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The record

What it does: RunJS is a desktop scratchpad for rapidly prototyping JavaScript and TypeScript, with code results shown alongside the editor.
Runtime environments: RunJS includes Node.js and browser environments for experimenting with code and browser APIs.
NPM packages: The NPM Packages tool installs libraries from the npm registry for use without setting up a project on disk.
Debugging: Logpoints print values from selected lines without changing source code or adding console.log calls.
Code snippets: Users can save reusable snippets and import or export them as JSON files.
AI integrations: AI Chat can connect to OpenAI, Anthropic, Gemini, Mistral, or a local model served by tools such as Ollama.
AI key handling: RunJS says AI API keys are stored locally and used only to authenticate requests to the selected provider.
Privacy: The privacy policy says RunJS does not sell, rent, or loan identifiable customer information and describes its personal-data use as GDPR-compliant.
Platforms: The site offers desktop downloads for macOS, Windows, and Linux, including Linux AppImage and Debian packages.
Who it is for: RunJS describes use by developers prototyping and debugging, and by teachers and students learning to code.
Education licenses: Eligible students and teachers can request a free full license with one year of updates, intended for learning and teaching rather than commercial work.
Support: The creator says support questions go directly to him, and education license applicants usually hear back within a day or two.
License limit: A paid license can be active on up to two devices at the same time.
Headquarters: Little Paxton, St. Neots, United Kingdom

Where it ranks on Freedom251

Best Code Playground Software in 2026#19 of 58

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Sources

runjs.app/docs· checked 4 Oct 2026
runjs.app· checked 4 Oct 2026
runjs.app/docs/features/npm-packages· checked 4 Oct 2026
runjs.app/docs/features/logpoints· checked 4 Oct 2026
runjs.app/docs/features/snippets· checked 4 Oct 2026
runjs.app/docs/features/ai-chat· checked 4 Oct 2026
runjs.app/privacy· checked 4 Oct 2026
runjs.app/about· checked 4 Oct 2026
runjs.app/education· checked 4 Oct 2026
runjs.app/buy· checked 4 Oct 2026