What's the best iPhone App for Walt Disney World?

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One app that would be useful if more people new about it and used it is the iFastPass app. It basically allows you to exchange, pickup, or give unused Fastpasses to other guests in the park. The problem is since so many people don't know about you rarely see people in the app looking to exchange or hand out Fastpasses. I found it very interesting and hope more guests get onboard, especially with the new Fastpass changes that maybe coming in March.