libGDX vs Unity 2D

Lots of references, tutorials and open source code to learn from.

While it may not always have the best performance for a particular device or system, it's one of the few engines which consistently performs very well across different platforms.

scene2d is a 2D scene graph, scene2d.ui is a UI toolkit on top of that. It enables very complex mobile and desktop UIs.

Since it's built with Java and runs on the JVM, any language that compiles to Java bytecode can be used to develop games with libGDX.

A Java port of the Box2D physics engine is included in libGDX.

LibGDX supports both 2D and 3D game development. Allowing developers to migrate from 2D to 3D with ease without having to switch the engine they are using or having to learn a new API.

Unlike some engines, which only allow you to make your game in a few specific ways, libGDX allows you to design any type of game you wish as it is extremely customisable.

The libGDX community, in the official libGDX forum is extremely helpful and approachable for any kind of question regardless of the its quality or difficulty.

The forums themselves are a very helpful resource for any issue or guide simply by searching past posts in there.

In addition to the forums, there's also the official #libgdx IRC channel on Freenode.

Sometimes it is necessary to access platform specific APIs, e.g., adding advertisement services or leaderboard functionality provided by frameworks.

libGDX uses the Apache License 2.0.

Not only is libGDX free and open source but also it's license gives you a lot of power over the engine. As long as you provide a copy of the license, give credit, do not hold devs liable and do not use libGDX logo in any engine forks you can do pretty much anything you want.

It is written in Java so you can easily make games using Kotlin and Ktx project will help you get all advantages of this language.

LibGDX itself is pretty mature, and get updates not quite frequently, but various libraries for it are actively updated.

You can write once and run anywhere (Android, IOS, Desktop, Browser) also lately came with lib to deal with VR.

libGDX has built in support for many 3rd party tools, including (but not limited to) Bullet Physics, Box2DLights and the well-praised Tiled Map Editor.

Even though the official documentation might be lacking, there are many tutorials on YouTube for libGDX.

Very good tools for rendering fonts.

Old XNA users may like libGDX since it's API is actually very similar to XNA's.

Unlike Unity or other engine, it allows to optimize a language that uses garbage collector when using patterns of objects you can control the use of memory without needing a language like C / C ++, getting the same speed in a more productive language.

2D game creation was a major feature request from the Unity community and was added with version 4.3. 2D is provided in both the Pro and Free distribution of Unity.

Mecanim brings state machines and blending to 2D bone animation. The state machine editor allows for designers and programmers to visually create a Finite State Machine (FSM) to control when animations should play. Mecanim also allows for blending so an animation can transition smoothly between two states without the need of in between frames made by an animator.

Both types of 2D animation for game development are supported in Unity’s system and can be used interchangeably in the timeline.

Usually used for character customization, programmers can change any sprite in a bone animation at runtime easily by referencing the bone and loading the new sprite from the resources folder.