When comparing ImpactJS vs Gideros, the Slant community recommends Gideros for most people. In the question“What are the best 2D game engines?” Gideros is ranked 26th while ImpactJS is ranked 57th. The most important reason people chose Gideros is:
Gideros provides on device players for iOS and Android that can be used to instantly try out your code directly from the Gideros IDE.
Specs
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Pros
Pro Extensive documentation available to support development
ImpactJS has an active user community that busily produces tremendous resources including videos, books, tutorials, walkthroughs and more. There are also comprehensive class documentation available.
Pro Excellent collision detection system
Impact provides 2 types of collision detection; static and dynamic collisions. Both of which are easily integrated into game development.
Pro Extendable
Many plugins are available, including one called Impact++ which adds features like pathfinding and dynamic lighting.
Pro Level editor
Built-in map editor with support for tiling, collision layers, and actors.
Pro Optimized
Works with Box2d physics library, comes with all worthwhile elements for actors built in.
Pro Truly cross-platform allowing developers to build for anything
Extending the reach of a game developed with ImpactJS is easy due to the cross-platform nature the framework. There are Considerations around performance, resolution and audio, however all can be appropriately addressed when in development. Works in the browser via Canvas, even on mobile. Easily translatable into a packaged app.
Pro Instant on device testing
Gideros provides on device players for iOS and Android that can be used to instantly try out your code directly from the Gideros IDE.
Pro Auto scaling and image resolutions
Gideros provides an easy way to target various screen sizes by providing automatic scaling options and choosing the best image resolution based on device screen automatically
Pro Local builds
You can build apps without an online dependency.
Pro Friendly & helpful community
Gideros has an active forum where you can find friendly and helpful advice.
Pro New features and improvements are released regularly
Gideros is being constantly updated and improved by the main developers.
Pro All in one studio, no complicated setup
Gideros Studio is incredibly easy to set up. Once installed it is very easy to create a new project or open one of the many example projects. Trying out an example on the desktop is two clicks away.
Pro Easy plugin architecture
Gideros Studio has a very powerful feature which enables developers to use a C/C++/Java/ObjC library next to Lua. This way it's possible to call the library functions under Lua, get the results and interpret them directly under Gideros Studio.
Pro Supports many platforms
Gideros supports iOS, Android, Windows, MacOS, WindowsRT, Windows Phone and HTML5 platforms.
Pro Amazing 2D performance
2D performance is amazing.
Pro Very easy to learn
Gideros uses the Lua programming language which is very easy to learn (and very powerful). There are some excellent video tutorials too, to help you get started. The Gideros forum community are also very friendly and helpful if you any any problems.
Cons
Con Inactive
The last update was in 2014.
Con Cost of $99
While most HTML5 frameworks are offered as free open source projects, ImpactJS has a one time cost and no free option.
Con Few resources, but growing
Gideros has a small community, and therefore do not have as many "How to make a game" tutorials. However, there are a couple of excellent books available that can take you through the fundamentals.
Con The Gideros IDE is not as fully featured as other IDEs
The Gideros IDE is not as fully featured as other IDEs, but you can easily use the very powerful and compatible ZeroBrane Studio IDE.
