In a clever "Why don't they all do this?" touch, Timer's timers don't stop at zero. Rather, once a timer reaches zero, it rolls right on through and counts up, so if you missed the alert, you know exactly how long ago the timer ended. My only complaint here is that I wish Timer added a minus (-) sign when counting up to make it even clearer that what you're seeing is "stoppage time."
One other minor complaint is that when an alarm ends, its alert sound plays only once. Granted, the timer's button continues to flash and, as I noted, the timer counts up, so it's easy enough to figure out that a timer is done, but if I set my phone down on the kitchen counter and go to the next room, I occasionally miss a timer alert. I'm guessing that App Cubby chose this approach because, with the capability to have up to 15 timers, you could end up with multiple alerts playing over each other, with no way to tell which sound goes with which timer. Still, I wish the timer configuration screen included an option to repeat the alert sound until you stopped the timer.
Really, my biggest complaint--which is more compliment than criticism--is that I wish there was an iPad version of Timer so that I could use the app on even more of my devices. It's a flexible and easy-to-use way to track your timed tasks.
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