There aren’t too many variables when looking for a countdown timer. In a recent search, I looked at five options in the appstore before settling on ‘Days To Go’ which won because of its innovative ability to import from current calendar entries.
The Apps were anywhere from free to a few dollars – my favorites were all $0.99. I looked at Days to Go, DownCount, CountDown, T-Zero and another named CountDown. Some of the older versions which had not upgraded to the look and feel of iOS 7 had very difficult methods of adding a new event. The use of scroll wheels and dates was surprisingly difficult, but present in at least two apps.