Run Python. It never leaves your tab.

A genuine CPython build compiled to WebAssembly, executing on your own machine. Nothing is uploaded, so there is nothing for me to log, throttle or lose. The whole standard library is there; sockets and subprocesses are not.

Nothing uploaded, nothing logged

runs in your tabCPython 3 via Pyodide (WebAssembly)

import sys

print(f"Hello from Python {sys.version.split()[0]}")

nums = [5, 2, 9, 1, 7]
print(sorted(nums))

Tab indents · Shift+Tab dedents · Esc then Tab leaves the editor

Output

Output appears here. Press ⌘/Ctrl + ↵ to run.

Why this one never touches my server

The runtime is shipped to you and executed on your machine, so there is no endpoint to attack, no queue to wait in and no rate limit to hit. It also means I never see your code, which is the honest version of a privacy promise: not that I choose not to look, but that it never arrives.

Read the architecture