Instashare is yet another file-sharing app for iOS and Mac. You can send photos, PDFs, and more, all over a local Bluetooth connection (no WiFi or login necessary). The nice part is that the sharing goes both ways; it's not just Mac-to-iOS, but also vice-versa. It's all done via drag-and-drop—about as simple as it gets. The universal iOS app is free (with a $0.99 in-app purchase to get rid of ads) and the Mac menu bar app is $3.