Available in iTunes for the iPhone is a free Shot Timer app from Taurus. It’s not going to replace a PACT or Pocket Pro on the competition circuit, but I’ve tried the free app and it works well. Here is more info on the app from Taurus:
SHOT TIMER APP
To express our gratitude to you for being a loyal Taurus customer, we would like to offer you FREE OF CHARGE the “Taurus Timer” An app for the Iphone that you can download to your phone from the iTunes store.
• Use the new “Taurus Shot Timer” to test your speed and accuracy.
• Easy to use both outdoors and indoors with our anti-echo technology.
• Review time between consecutive shots, shot count and total time shooting.
• Personalize the “Taurus Shot Timer” to your comfort with special settings such as start delay, sensitivity, par time and random start.