I'm very happy and a little nervous to say we've started sending beta invites for Recent on iOS and Android. It's been tens of thousands of lines of code and late nights and bug fixes and user testing and redesigns and crashes and crash reporting and performance improvements and refactoring — and innumerable other details that I will spare you because nobody else really cares.
What's a bit surprising is that a clear majority of early adopters use Android: nearly 60%. I would have expected the majority to be iOS.
There's a risk of generalizing from a relatively small amount of data, but the breakdown so far is pretty clear. So we may have been correct to decide early on to develop and release simultaneously for both. If had I picked a single platform, it would have been iOS (perhaps because I'm an iPhone user). And that would have been a mistake.