I wanted a fast way to test code snippets without opening an IDE or spinning up a repl. So I built simplelanguages.com.

You pick a language, type code, hit Ctrl+Enter. The backend compiles and runs it, sends back stdout/stderr/exit code/timing.

What it runs:

python, javascript, typescript, java, c, c++, c#, rust, lua, go, ruby, php, html, css

What's there: