The app is Android only at the moment, so there's that, but also it actually doesn't use bluetooth file exchange, just connects via bluetooth and sends a data s

The app is Android only at the moment, so there's that, but also it actually doesn't use bluetooth file exchange, just connects via bluetooth and sends a data stream which can include encoded photos. Actually on iPhone it would be a little easier because P2P wifi connections have been standard for a few OS versions (they're new in Android), so the connection would be a little easier to establish and way faster.