I'm hoping to improve my Rubik's cube times significantly over the summer, and a key part of that is constantly keeping track of my times. I have a stackmat timer, but this is not very practical to carry around in the pockets of my shorts. During a recent competition, I saw some people keeping time on specialized apps for their smartphones or tablets, and I see a bunch of these available in the Apple App Store, or listed in the Mobile Software article on the SpeedSolving Wiki. Each seems to have its features, shortcomings, and bugs. So what is your favorite app for speedsolving on the go?