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Online Dart Compiler

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

main.dart
Output
Click Run to see the output here.

Run Dart online in your browser

This is a free online Dart playground and code runner. Write Dart code directly in your browser, hit Run, and execute on the Dart stable SDK in seconds — no local Dart install, no pub get, no IDE setup required. It's the fastest way to test a Future, verify a null-safety rule, or try a Dart language feature.

Under the hood, the editor uses the same engine as VS Code (Dart syntax highlighting, autocompletion, diagnostic squiggles), and your code runs with the Dart VM in a sandboxed container — sound null safety, async/await, Futures, Streams, records, and pattern matching all available out of the box. Whether you're learning Dart before moving to Flutter or prototyping a pure-Dart algorithm, this online Dart compiler goes from idea to output in seconds.

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 — the same editor engine that powers VS Code, with sound null safety surfaced inline.
  • Stdin input supported — stdin.readLineSync() reads from the playground's input box, so command-line-style Dart programs and interactive exercises work end-to-end. No install — no Dart SDK, Flutter SDK, or Android Studio.
  • 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 completely free — no sign-up, no Dart SDK to install, 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. Note: the playground runs pure Dart, so Flutter widget code won't render here — but you can test any Flutter-language-feature or pure-Dart logic.
Does the Dart playground work on mobile and Chromebooks?
Yes. The Dart playground runs on any modern browser — desktop, tablet, or mobile. Great 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. The playground has a stdin input box — 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 structured practice, 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.