Some developers are using Apple’s TestFlight tool to distribute personal apps, often just for themselves or friends, away from the App Store (David Pierce/Protocol)

David Pierce / Protocol:
Some developers are using Apple’s TestFlight tool to distribute personal apps, often just for themselves or friends, away from the App Store  —  This club has everything: Cool unreleased apps.  Hardly any rules.  Endless mystery and tech cred for those who get in.