20+ languages, zero setup

Write. Compile.
Run Code Online.

No installs, no environment to configure. Pick a language, paste your code, and see the output in the same tab — built for quick tests, teaching, and interview practice.

Explore Languages How it works

2.4ms execution

main.py Python 3.11

                  # Fibonacci sequence
                
                  def
                    fibonacci(n):
                
                    a, b
                    = 0,
                    1
                
                    for _
                    in range(n):
                
                      yield
                    a
                
                      a, b
                    = b, a
                    + b
                
                  print(list(fibonacci(8)))

▸ Output

[0, 1, 1, 2, 3, 5, 8, 13]

Sandboxed & secure

20+

Languages to run

20+

Free tools beyond the compiler

No plans, no paywall

Sign-ups required

// supported

Languages & Tools

Pick a language, start writing, and see results in milliseconds. No login required.

C++

System programming

Python

Scripting, data, ML

JavaScript

Web development

HTML

Page structure

CSS

Styling

Java

Enterprise apps

C

Low-level programming

PHP

Server-side web

TypeScript

Typed JavaScript

Ruby

Web frameworks

Swift

iOS apps

Kotlin

Android apps

Go

Cloud services

Rust

Safe systems programming

Dart

Flutter apps

Perl

Text processing

Shell

Command scripting

SQL

Database queries

API Test

Test your APIs online

Detect My PC

Analyze device, browser & GPU

Word Counter

Count words & characters instantly

Code Minifier

Minify HTML, CSS & JS

Dummy JSON API

Free fake APIs for testing

YT Live Views

Track live views in real time

YT Subscriber Counter

Track subscribers live

Finance Calculators

All-in-one financial tools

Password Generator

Generate secure passwords

Pinterest Downloader

Download videos & photos

Instagram Downloader

Download Reels instantly

YouTube Downloader

Download videos instantly

Twitter Downloader

Download Twitter videos

YT Tags Extractor

Extract video tags instantly

YT Keywords Gen

Generate SEO keywords

YT Thumbnail DL

Download thumbnails instantly

YT Hashtags Gen

Generate trending hashtags

Website Status

Check if a site is down

Age Calculator

Exact age in years, months & days

// not sure where to start

Which Tool Do I Actually Need?

Task-to-tool quick reference
If you want to...	Use this
Check a REST or GraphQL endpoint before wiring it into your app	API Tester
Mock an API response while the real backend isn't ready yet	Dummy JSON API
Trim word or character count for a meta description or essay	Word Counter
Shrink HTML, CSS, or JS before shipping it	Code Minifier
See what browser, device, or GPU a visitor is on	Detect My PC
Find out if a site is down for everyone or just you	Website Status Checker
Work out someone's exact age in years, months, and days	Age Calculator
Save a video from YouTube, Instagram, Pinterest, or Twitter	Video Downloaders
Track a video's live view count or a channel's subscriber count	YouTube Live Counters

// why us

Built for developers
who move fast.

Nothing here is trying to be clever. It's just meant to get out of your way.

Fast execution

Code runs in a sandboxed container the moment you hit Run. Most snippets finish in well under a second.

Isolated & secure

Each run happens in its own disposable container. Nothing you write touches another session, and nothing sticks around after you close the tab.

Works on any device

The editor scales down to a phone screen without losing syntax highlighting or the console panel.

One-click downloads

Export your file with the right extension already attached — .py, .java, .cpp, whatever you were writing.

Instant sharing

Every snippet gets a shareable link automatically — handy for code review or walking someone through a bug.

Free, with no catch

No run limits and no "upgrade to keep going" wall. If that ever changes, it'll be announced here first.

// quick start

From zero to running
in four steps.

Pick a language

Over 20 languages and a few frameworks, from Python to Rust.

Write

Syntax highlighting, auto-closing brackets, and autocomplete — nothing fancier than that.

Run it

Output shows up in the console panel below the editor, usually within a second or two.

Share or export

Grab a link or download the file — either way, no account needed.

New to Coding? Here's How the First Few Languages Compare

Picking a first language
Language	Good first choice if...	Where it's used
Python	You want readable syntax and fast feedback loops	Scripting, data work, machine learning
JavaScript	You're heading toward web development	Browser apps, Node.js backends
Java	Your course or job already runs on it	Enterprise backends, Android (alongside Kotlin)
C++	You want to understand memory and performance directly	Systems programming, competitive programming

// who this is for

Built for the moments
when setup gets in the way.

Technical interviews

Spin up any language in seconds instead of setting up a local environment mid-call.

Teaching

Send students a link instead of walking a whole class through an install guide.

Competitive programming

Try an approach in C++ or Python without opening your full IDE.

Quick prototyping

Test whether an idea even works before you commit to a full project setup.

// let's go

Stop setting up.
Start shipping.

No account, no install, no catch — just open a language and start typing.

Launch the Editor Learn more about us

Write. Compile.Run Code Online.