This came up not long ago, and we have to define "cross platform" to say whether Red meets the criteria. Red does have a cross platform GUI system, though it is

This came up not long ago, and we have to define "cross platform" to say whether Red meets the criteria. Red does have a cross platform GUI system, though it is only fully implemented on MacOS and Windows currently. We don't run on iOS at all yet. What the current system shows is that a single, cross platform dialect can abstract away the native OS APIs in a clean way, though there will always be tradeoffs, as every OS has different features. The RED Wallet is an example of a cross platform app, done today.