Release notes
What's new
New tools and site changes, newest first.
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Recently used, a command palette, and portable favorites
The home page now opens with the tools you used last, so a returning visitor lands on familiar ground instead of a blank list. Ctrl+K (or the search button in the header) opens a palette that jumps to any of the 1,089 tools from anywhere on the site, including from inside another tool. Favorites can be exported to a JSON file and imported on another device. Every tool page also carries a share card for social previews.
Mermaid diagram editor
Write Mermaid diagram syntax and see it rendered live — flowcharts, sequence diagrams, and more, with a copyable SVG export.
17 browser IDEs
JavaScript, TypeScript, Python, HTML, CSS, SQL, Lua, PHP, Ruby, C, C++, Go, Java, C#, Kotlin, Scala and Swift editors that run entirely in the tab — no install, no server round-trip.
Recently added tools
- Mermaid Diagram EditorOnline diagram editor based on Mermaid.js, supports architecture, flowchart, state, sequence, class diagrams
- Swift IDEEdit Swift code with syntax highlighting. Running Swift needs SwiftWasm — see notes.
- Scala IDEEdit Scala code with syntax highlighting. Running Scala needs Scala.js — see notes.
- Kotlin IDEEdit Kotlin code with syntax highlighting. Running Kotlin needs the Kotlin/WASM toolchain — see notes.
- C# IDEEdit C# code with syntax highlighting. Running C# needs a compiled assembly — see notes.
- Java IDEEdit Java code with syntax highlighting. Running Java needs a compiled .class — see notes.
- Go IDEAnalyze and format Go code in your browser via a WebAssembly Go toolchain.
- C++ IDECompile and run simple C++ programs in your browser (JSCPP interpreter).
- C IDECompile and run simple C programs in your browser (JSCPP interpreter).
- Ruby IDEExecute Ruby code in your browser with a WebAssembly Ruby runtime.
- PHP IDERun PHP code in the browser using a WebAssembly PHP runtime.
- Lua IDEExecute Lua scripts in your browser via a WebAssembly Lua VM.
- SQL IDERun SQL queries in your browser using a WebAssembly SQLite engine.
- CSS IDEWrite CSS and see the styled preview update instantly in a sandbox.
- HTML IDEEdit HTML and preview the rendered page live in a sandboxed iframe.
- Python IDERun Python code online with a WebAssembly Python runtime (Pyodide). No install.
- TypeScript IDEWrite and run TypeScript code in your browser — transpiled and executed locally.
- JavaScript IDEWrite and run JavaScript code in your browser with a built-in editor and console.
- Zero Width Text Steganographyzero width text steganography
- Youtube Timestampyoutube timestamp
- Yes Or Noyes or no
- Xpath Testerxpath tester
- XML JSONxml json
- World Clockworld clock