AAC Tech Connect has provided help to beleaguered assessors for years via their side by side comparisons of SGDs known as the Device Assistant.
Well, they've done it again with their AAC Apps Assistant. Its a great place for families, professionals, and administrators to compare features, functions, costs, and capacities of over 100 communication apps. Currently, their review covers apps that are available for Apple devices (aka. iOS devices), but they assure that additional platforms will be added soon!
I haven't yet had a chance to take advantage of their generous 1-month free trial, but that's what 3-day weekends are for!
Don't worry, be App-y.