Compilers

Write code here, see the output immediately

An editor on the left, a console on the right, and thirteen languages plus HTML/CSS. Nothing to install, nothing to sign up for — the same engines that power our free coding lab.

main.py Run Output · Python ·

def greet(name):
    return f"Assalam-o-Alaikum, {name}!"

print(greet("Faisalabad"))

$ python main.py
Assalam-o-Alaikum, Faisalabad!

Process finished with exit code 0

The full editor — with a draggable divider, light/dark switch, fullscreen, share links and output download — is being finished right now. Until then, every one of these languages you need for a course already runs inside the free coding lab.

Languages

Thirteen languages and HTML/CSS, one page

Each language runs on an engine that works offline in the browser, so the compiler keeps working on a slow connection.

.py Python Beginner favourite
.js JavaScript Browser native
.ts TypeScript Typed JavaScript
.html HTML / CSS Live preview
.java Java OOP backbone
.kt Kotlin Android
.c C Systems
.cpp C++ DSA
.cs C# .NET
.r R Statistics
.rs Rust Fast & safe
.rb Ruby Readable
.swift Swift iOS
.php PHP Server side

Split that obeys you

Drag the divider to give the editor or the console more room — and it remembers your choice next visit.

Light and dark

The editor follows your preference, and the rest of the site stays orange, white and black.

Share and download

Copy a link to your exact code, or download the output as a text file to paste in your assignment.

Practise what the course teaches

The compiler pairs with our tracks: read the concept, try it in the compiler, then prove it with the automatic checks in the lab.

Open the coding lab