Here’s the Deal
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When comparing Rainbow vs Crafty.js, the Slant community recommends Crafty.js for most people. In the question“What are the best 2D game engines?” Crafty.js is ranked 37th while Rainbow is ranked 79th.
Specs
LanguagesC++; C#; Lua
2DYes
3DNo
Desktop targetsLinux; macOS; Windows
Dev platformsLinux; macOS; Windows
LicenseMIT
Mobile targetsAndroid; iOS
Scripting languageC++; C#; Lua
Supported languagesC++; C#; Lua
Traditional codeC++; C#; Lua
LanguagesJavascript
Ranked in these QuestionsQuestion Ranking
Common Questions
Other Questions
Pros
Pro Open source
Distributed under the MIT License.
Pro Written in modern C++, is scriptable in Lua
Pro Cross-platform
With support for Android, iOS, Linux, Mac OS X and Windows.
Pro Optional FMOD audio engine
Pro Supports Spine
Pro Physics
Box2D integrated with Lua bindings.
Pro Javascript
Pro Eventbinding
Easy to learn, based on Entities and Components, the later being class-like objects that entities inherit.
Pro Modular
Has open function binding systems, allowing easy creation of custom components.
Cons
Con Not as feature-rich as other engines
Con Small community
Being fairly new on the scene, there aren't much of a community to speak of.
Con No IDE
If you like having some huge GUI akin to Gamemaker, Unreal, Unity, etc, Crafty is not for you.