>Admittedly it might look a bit out of place on iOS

Since last year, Google's iOS apps have gradually adopted more and more elements of Material Design, including the color palette, the app bar menu, the MD iconset, the floating action button. And they typically remain best in class; it turns out that Material Design works well on iOS too.

(Note Google's implementation is not necessarily consistent--just look at the different button tap effects for Calendar vs. YouTube on iOS. Sigh.)

We've also borrowed MD concepts for the iOS version of our new app (https://recent.io/) without user complaints.