TestFlight is a free tool offered by Apple, which allows you to test an iOS app before it goes online on the App Store. How to use Testflight effectively: follow some easy steps to take advantage of iOS Beta testing

An important part of the sales process of an app is the product demo. This may take place before or after the deal has be sealed, but either way, your client will absolutely want to preview the application that will be representing their company before it goes public.