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I've tried most of the services offered to support beta testing of apps, and believe TestFlightapp.com was by far the best.
Apple must have thought so too, as it acquired them with Burstly in [February 2014](http://www.theverge.com/apps/2014/2/21/5434060/apple-buys-maker-of-the-ios-testing-platform-testflight)
Beyond the almost immediate axing of support ...