ToolBoost Open editor

Run Python online,
free, with AI

A free Python editor that runs in your browser. Write a script, press Run, and see the output instantly — with AI autocomplete and an assistant that explains errors.

Start coding free →

No install · No account · Free

main.py
def fizzbuzz(n: int) -> str:
    if n % 15 == 0: return "FizzBuzz"
    if n % 3 == 0:  return "Fizz"
    if n % 5 == 0:  return "Buzz"
    return str(n)

for i in range(1, 16):
    print(fizzbuzz(i))

Features

Run Python in the browser

No Python install, no virtualenv. Your code runs locally in the page — ideal for learning, homework and quick scripts.

AI that fixes errors

Paste a traceback or select broken code and ask the AI assistant why it fails. Get a fix as a side-by-side diff.

Autocomplete as you type

Ghost-text AI code completion suggests the next line. Press Tab to accept.

How it works

  1. Open the ToolBoost editor.
  2. Create a file ending in .py, or pick Python from the language menu.
  3. Write your code and press Run — output appears in the panel below.

Tutorial: your first Python program online

Python is one of the easiest languages to start with, and you don't need to install it to learn. In ToolBoost, Python 3 runs directly in the browser tab through Pyodide, a WebAssembly build of CPython. The first run downloads the runtime (a few seconds); after that, scripts start instantly.

1. Print and variables. Type name = "Ayu" and print(f"Hello, {name}"), then press Run. The output panel shows the result.

2. Loops and lists. Try for n in range(5): print(n * n). Lists, dictionaries, list comprehensions and f-strings all work as they do on your computer.

3. Use the standard library. Modules like math, random, json, datetime and collections are available out of the box.

4. Fix errors with AI. When you see a traceback, open the AI chat and ask "why does this fail?". The assistant sees your file, explains the error in plain language and proposes a fix you can review as a diff.

Limits to know: programs that need input(), files on your disk, network sockets or native packages won't work in the browser. For learning, algorithms, homework and data practice, it covers almost everything.

FAQ

Is this Python online compiler free?

Yes. ToolBoost is completely free and needs no account.

Can I use Python on my phone?

Yes. The editor works on Android and iPhone browsers.

Which Python version runs?

Python 3 runs in the browser via WebAssembly. The standard library is available; packages that need native system access are not.

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