RubyMotion apps are created from the terminal command-line. You get to keep using your favorite editor.
Write code in the interactive console. See changes in real-time. Integrate 3rd-party libraries. Use the built-in debugger to spot problems.
Install your app on your devices. Send it to your colleagues or friends. Write functional and integration tests with the integrated automated testing framework.
Time to ship! Create an app package suitable for a submission into Apple's iOS or Mac App Store, or Google Play.