You'll use your smartphone to control your smartwatch, because, as we already established, the smartphone is an excellent, capable tool, and the watch is a mere conduit. That means the app has to be simple to use, but full-featured enough to handle everything the smartwatch can do. I would actually look to Samsung, of all companies, for this one--the TecTiles app on its Galaxy phones, which controls how the phone interacts with NFC-enabled stickers, is just about perfect. Super simple, just a grid of features you want the watch to do. Easy!