There are a lot of instant messaging apps out there for Android and iOS, none of which differentiate themselves in any hugely significant way. The most interesting is Apple's revitalised iMessage, set to launch in iOS 10 alongside the new iPhone 7. A new cross-platform app from a Brisbane startup called Amity, though, promises the lion's share of iMessage's glossy new features along with real-time features that only activate when two (or more) participants are actively chatting.