Your iPhone IPSC Shot Timer Options:
IPSC Timer – $4.99
Taurus Timer – FREE
Shot Timer Pro – $18.99
SureFire Shot Timer – FREE
I haven’t tried any of these apps, but $18.99 for the Shot Timer Pro is a ridiculous price for an iPhone app, and judging buy the website it has little to no advantages over the free ones.
The SureFire shot timer definitely looks like the best option to try out first, before spending any money.