Entitas is free, but powered by your donations

Entitas is the most popular open-source Entity Component System Framework (ECS) and is specifically made for C# and Unity. Several design decisions have been made to work optimal in a garbage collected environment and to go easy on the garbage collector. Entitas comes with an optional code generator which radically reduces the amount of code you have to write and makes your code read like well written prose.

• #1 open-source ECS on GitHub
• 100% open-source under the MIT License
• great and helpful community on Discord
• easy to learn and easy to use
• works great in pure C# standalone projects without Unity
• comes with great Unity integration called Visual Debugging
• battle-tested at companies like Popcore (Rollic / Zynga / Take Two), Gram Games, Wooga, Plarium, Storm Chaser and many more

Video	Title	Resources
	Entitas ECS Unity Tutorial - Git & Unit Tests
	Entitas ECS Unity Tutorial - Setup & Basics
	Unite Europe 2016: ECS architecture with Unity by example	SlideShare: Unite Europe 2016
	Unite Europe 2015: Entity system architecture with Unity	SlideShare: Unite Europe 2015

The optional code generator lets you write code that is super fast, safe and literally screams its intent.

var entity = context.CreateEntity();
entity.AddPosition(Vector3.zero);
entity.AddVelocity(Vector3.forward);
entity.AddAsset("Player");

using static GameMatcher;
public sealed class MoveSystem : IExecuteSystem
{
    readonly IGroup<GameEntity> _group;
    public MoveSystem(GameContext context)
    {
        _group = context.GetGroup(AllOf(Position, Velocity));
    }
    public void Execute()
    {
        foreach (var e in _group.GetEntities())
            e.ReplacePosition(e.position.value + e.velocity.value);
    }
}

Entitas is fast, light and gets rid of unnecessary complexity. There are less than a handful classes you have to know to rocket start your game or application:

• Context
• Entity
• Component
• Group

Entitas ECS
+-----------------+
|     Context     |
|-----------------|
|    e       e    |      +-----------+
|       e      e--|----> |  Entity   |
|  e        e     |      |-----------|
|     e  e     e  |      | Component |
| e          e    |      |           |      +-----------+
|    e     e      |      | Component-|----> | Component |
|  e    e    e    |      |           |      |-----------|
|    e    e     e |      | Component |      |   Data    |
+-----------------+      +-----------+      +-----------+
  |
  |
  |     +-------------+  Groups:
  |     |      e      |  Subsets of entities in the context
  |     |   e     e   |  for blazing fast querying
  +---> |        +------------+
        |     e  |    |       |
        |  e     | e  |  e    |
        +--------|----+    e  |
                 |     e      |
                 |  e     e   |
                 +------------+

Read more...

The Code Generator generates classes and methods for you, so you can focus on getting the job done. It radically reduces the amount of code you have to write and improves readability by a huge magnitude. It makes your code less error-prone while ensuring best performance.

Read more...

The optional Unity module "Visual Debugging" integrates Entitas nicely into Unity and provides powerful editor extensions to inspect and debug contexts, groups, entities, components and systems.

Read more...

Read the wiki or checkout the example projects to see Entitas in action. These example projects illustrate how systems, groups, collectors and entities all play together seamlessly.

Show releases

Coming soon

Entitas and all dependencies are available as NuGet packages. More detailed explanation coming soon.

Entitas on the Unity Asset Store is deprecated and will not be updated anymore. The last version available on the Asset Store is 1.12.3 and is free to download. Please see discussion Entitas turns 7 - and is FREE now

Big shout out to @mzaks, @cloudjubei and @devboy for endless hours of discussion and helping making Entitas awesome!

• @sschmid | @s_schmid | @entitas_csharp

Entitas is available in

• C#
• C++
• Clojure
• Crystal
• Erlang
• F#
• Go
• Haskell
• Java
• Kotlin
• Objective-C
• Python
• Scala
• Swift
• TypeScript