Trick or Treat Tracker is a free iPhone app developed by Sean Kosanovich. It falls under the category of Utilities & Tools and offers a convenient way to keep track of the number of Trick or Treaters that visit your house during Halloween.

With Trick or Treat Tracker, you can easily monitor and compete with your friends in real-time. The app supports iCloud, ensuring that your count is synced across all your devices. You can also utilize iCloud sharing to share your Trick or Treater count with your friends, allowing them to see the numbers in real-time through the new "Sharing" tab.

One of the standout features of Trick or Treat Tracker is its history function. It allows you to save your count from every year, enabling you to look back and see how many Trick or Treaters you had each year. This feature is particularly useful for estimating how much candy to buy for future Halloweens.

To add a touch of personalization to your tracking experience, Trick or Treat Tracker offers a variety of spooky backgrounds for customization. Choose the one that suits your Halloween spirit the best.

Overall, Trick or Treat Tracker is a handy tool for anyone who wants to keep track of their Halloween visitors and compete with friends. Its iCloud support, history feature, and personalization options make it a useful companion for the Halloween season.