Code Playgrounds
Run and compile code in 40+ languages right in your browser — from Python, Go and Rust to SQL and diagram renderers, with no server round-trip.
These tools run entirely in your browser. Open any of them in the app:
Python REPL
Run Python code in your browser.
JavaScript Playground
Run JavaScript code in your browser with QuickJS-ng.
PHP Sandbox
Run PHP code in your browser.
Go Playground
Compile and run Go code in your browser.
Rust Compiler
Compile and run Rust code in your browser.
C Compiler
Compile and run C code in your browser.
C++ Compiler
Compile and run C++ code in your browser.
SQL Playground
Run SQL against an in-browser SQLite database.
Shell
A BusyBox shell in your browser — pipes, redirects, tab completion.
Mermaid Diagrams
Render Mermaid diagrams — flowcharts, sequence, Gantt — to SVG.