Online Dart Compiler

Write, run, and share code snippets — no setup required.

main.dart

Alice
30

Output

Click Run to see the output here.

import 'dart:io';

void main() {
  String? name = stdin.readLineSync();
  String? ageStr = stdin.readLineSync();
  int age = int.parse(ageStr!);
  print("Hello, $name! You are $age years old.");
}

Run Dart online in your browser

A free online Dart playground and code runner. Write Dart in your browser, hit Run, and the code executes on the Dart stable SDK in seconds. No local Dart install, no pub get, no IDE setup to configure first.

The editor is built on the same engine as VS Code, so Dart syntax highlighting, autocompletion, and diagnostic squiggles all work. Code runs with the Dart VM in a sandboxed container, with sound null safety, async/await, Futures, Streams, records, and pattern matching all available out of the box. Good for learning Dart before moving to Flutter, or prototyping a pure-Dart algorithm.

What makes this Dart playground useful

Instant Dart execution — write code, press Run, and see output from the Dart VM in seconds, no pub get or IDE setup needed.
Full Dart syntax highlighting, autocompletion, and clear analyzer diagnostics, powered by the same editor engine as VS Code, with sound null safety surfaced inline.
Stdin input is supported. stdin.readLineSync() reads from the playground's input box, so command-line-style Dart programs and interactive exercises work end-to-end. No Dart SDK, Flutter SDK, or Android Studio on your end.
Dart stable toolchain — write null-safe Dart, use async/await, Futures, Streams, records, and pattern matching without installing the SDK.

What you can build in the Dart playground

async/await, Futures, and Streams: the idioms that underpin every Flutter app, runnable here without any UI boilerplate.
Classes, mixins, extension methods, and pattern matching with records and sealed classes: modern Dart 3 features you can test one declaration at a time.
Quick Dart experiments: test a null-safety rule, verify a late initializer, try a collection-if or spread operator, or confirm how a Future chain resolves.

Online Dart compiler FAQ

Is the online Dart compiler free?

Yes, the Dart playground is free to use. No sign-up, no Dart SDK to install, and no Flutter SDK or Android Studio required — open the page and run.

Do I need the Dart or Flutter SDK installed?

No install needed. You don't need the Dart SDK or Flutter on your machine. The online Dart runner executes your code on the Dart stable VM and returns the output in seconds. One thing to note: the playground runs pure Dart, so Flutter widget code won't render here, but any Flutter-language-feature or pure-Dart logic works fine.

Does the Dart playground work on mobile and Chromebooks?

Yes. The Dart playground runs in any modern browser, on desktop, tablet or mobile. Good for testing Dart from a Chromebook, iPad, or school computer where you can't install the SDK.

Does the Dart playground support stdin.readLineSync()?

Yes. stdin.readLineSync() (from dart:io) reads your typed lines the same way it would when you run dart run locally and type at the terminal. Handy for practicing pure-Dart algorithms and CLI-style exercises before moving on to Flutter.

How do I learn Dart after trying the playground?

Edit the sample Dart code, press Run, and iterate. When you want something more structured, Coddy's interactive Dart course covers null safety, async/await, classes, mixins, and modern Dart 3 features with hands-on exercises — a solid foundation before moving on to Flutter.