RunJS

Spec sheet

What it does

RunJS is a desktop scratchpad for rapidly prototyping JavaScript and TypeScript, with code results shown alongside the editor.Read 4 Oct 2026 · runjs.app

Platforms

The site offers desktop downloads for macOS, Windows, and Linux, including Linux AppImage and Debian packages.Read 4 Oct 2026 · runjs.app

Privacy

The privacy policy says RunJS does not sell, rent, or loan identifiable customer information and describes its personal-data use as GDPR-compliant.Read 4 Oct 2026 · runjs.app

Support

The creator says support questions go directly to him, and education license applicants usually hear back within a day or two.Read 4 Oct 2026 · runjs.app

Headquarters

Little Paxton, St. Neots, United KingdomRead 28 Sep 2026 · runjs.app

AI integrations

AI Chat can connect to OpenAI, Anthropic, Gemini, Mistral, or a local model served by tools such as Ollama.Read 4 Oct 2026 · runjs.app

AI key handling

RunJS says AI API keys are stored locally and used only to authenticate requests to the selected provider.Read 4 Oct 2026 · runjs.app

Code snippets

Users can save reusable snippets and import or export them as JSON files.Read 4 Oct 2026 · runjs.app

Debugging

Logpoints print values from selected lines without changing source code or adding console.log calls.Read 4 Oct 2026 · runjs.app

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.Read 4 Oct 2026 · runjs.app

License limit

A paid license can be active on up to two devices at the same time.Read 4 Oct 2026 · runjs.app

NPM packages

The NPM Packages tool installs libraries from the npm registry for use without setting up a project on disk.Read 4 Oct 2026 · runjs.app

Runtime environments

RunJS includes Node.js and browser environments for experimenting with code and browser APIs.Read 4 Oct 2026 · runjs.app

Who it is for

RunJS describes use by developers prototyping and debugging, and by teachers and students learning to code.Read 4 Oct 2026 · runjs.app

Plans and prices

Every RunJS plan and price →

Where Specifiction places it

• Code Playground Software#49 of 587.0