7 must-have mobile apps and devices from 2015

It's probably telling that Starbucks' mobile ordering feature is one of my favorite things from the tech world in 2015. When I prepare for a hike around San Francisco, I order fuel from my local Starbucks before I leave. After I head out, I swoop into the store, pick up my drink, and hit the road without slowing down (much).
Of course, the Starbucks app and its instant caffeine injections are just one of seven apps and devices that gave me the biggest buzz in 2015. The remaining six best a