Hetu is a lightweight scripting language purely written in Dart for embedding in Flutter apps. Our goal is to enable Flutter app & game to have hotfix and scripting ability.

Documentation(English)open in new window


  • Modern programming language syntax likes typescript/kotlin/swift, need very little time to get familiar with.
  • Full scripting language abilities: class OOP, prototype OOP, FP, module, errors, etc.
  • Runs on all platforms that flutter supports, including web browsers and desktop.
  • Extremely easy on binding, call Dart functions in script or call script functions in Dart with just one line.

Test Hetu script in the online playgroundopen in new window.

Quick start

To eval a string literal of Hetu code in Dart.

import 'package:hetu_script/hetu_script.dart';

void main() {
  final hetu = Hetu();
    var ht = {
      name: 'Hetu',
      greeting: () {
        print('Greetings from ${}!')

To pass a Map to script, modify it in script and get it back:

import 'package:hetu_script/hetu_script.dart';

void main() {
  final hetu = Hetu();
  hetu.init(externalFunctions: {
    'hello': () => {'greetings': 'greetings from Dart!'},
  var hetuValue = hetu.eval(r'''
      external fun hello
      var dartValue = hello()
      dartValue['reply'] = 'Hi, this is Hetu.'
      dartValue // the script will return the value of last expression

  print('hetu value: $hetuValue');
Last Updated:
Contributors: 邵燃