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Runtimes · Flutter

Interactive animation in Flutter.

Two Dart packages: egg_runtime talks to the native runtime, and egg_player gives you an EggPlayer widget that advances it every frame, draws it and sends it pointer input.

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In short

In Flutter, add the EggPlayer widget with the .egg bytes and the state machine name; onLoaded gives you the EggRuntime to set inputs (setBool, setNumber, fire) and view model properties, and onEvent receives the file's events. EggFit.expand fills phones and tablets alike for games.

Platform
Flutter apps
Binding
Dart packages egg_runtime and egg_player
Draws with
ui.Image from the native runtime
Same file everywhere
One .egg plays the same on every runtime
License
MIT or Apache-2.0

The widget

rings.dartdart
EggPlayer(
  bytes: bytes, // Uint8List of the .egg
  stateMachine: 'rings',
  fit: EggFit.expand,
  onLoaded: (runtime) {
    runtime.setNumber('move', 0.6);
  },
  onEvent: (event) => debugPrint('$event'),
)

Last checked against the product on 2026-10-15.

Examples you can play

All templates
Activity rings: an Ova Motion templateInterface
Activity ringsLog a walk, a run or standing time: three rings fill smoothly through view model bindings, and closing all three rains stars.
Tap to fly: an Ova Motion templateGames
Tap to flyTap or press Space to flap through the pipes: a script runs the bird, the pipes and the score; the ready and game-over screens follow its state.
Mood rating: an Ova Motion templateInterface
Mood ratingDrag the slider: the face goes from gloomy to beaming (one mouth arc flips through flat), the colours warm up and the word follows.
Choose your hero: an Ova Motion templateCharacters
Choose your heroPick a hero: it hops onto the stage in its own light, its name and story change and the stat bars slide to its numbers.

Questions

Does it support data binding?

Yes, for numbers, booleans and strings from Dart; the file can also bind colours, lists and pictures internally.

What can my code change at run time?

State machine inputs (booleans, numbers, triggers), view model properties bound in the file (text, numbers, colours, enums, pictures, lists), and pictures, sounds and fonts handed over by your app. Your code also reads the current state and the events the file reports.

Is the runtime free to use in commercial apps?

Yes. The runtimes are licensed MIT or Apache-2.0, and what you make in the editor is yours.

Read next

Interactive animation in SwiftUI.The Swift package wraps the runtime in EggPlayer and draws it in a SwiftUI EggView, with a Metal-backed view for the GPU and an audio helper for sound events.Interactive animation on Android.The Kotlin runtime wraps the native library for Android (arm64-v8a and x86_64) and the desktop JVM. Load a file, start its state machine, advance it each frame and render it.Learning that moves when children touch it.Characters that react, drag-and-match activities, letters that draw themselves: build them visually and play them on tablets, phones and the web.RuntimesPlay .egg files on the web, iOS, Android, Flutter, Unity, Unreal or through the C API.

Start with an egg.
Ship an interface.

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