A real playground, right on your page.
Code Runner is a tiny code playground you can embed anywhere in Notion. Pick a runtime language, type a few lines, and press Run (or Ctrl/Cmd+Enter) — the output console shows exactly what your program printed, including errors.
JavaScript executes instantly and 100% locally inside a sandboxed iframe — no network needed. The other 20 languages (Python, TypeScript, Java, C, C++, C#, Go, Rust, PHP, Ruby, Swift, Kotlin, Bash, Lua, Dart, Scala, Perl, Haskell, Elixir, R) run through the free Judge0 CE API. Your code is saved per language, so your Python scratchpad survives a page reload.
⚙️ Settings & Customization
- Theme
- Language
- Size
- Transparent background
- 🎨 Accent Color
Changes apply live — the embed link on the right and the preview above update instantly.
📖 How to embed in Notion
- Copy the embed link from the sidebar on the right.
- Open the Notion page you want the widget on and type
/embed. - Paste the link into the embed dialog and press
Embed link. - Drag the embed's bottom edge to resize it to taste.
🆕 What's new in v1.1
- ✦ 21 runtime languages — JavaScript runs fully offline
- ✦ Sandboxed iframe with console capture + infinite-loop watchdog
- ✦ Code persists per language across reloads
- ✦ Ctrl/Cmd+Enter to run, Tab indents
- ✦ 21 UI languages with RTL support
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