TestFlight is scheduled to shutdown on Feb 26 of this year (2015). They have now set up testflight to work through the developer portal. However it looks like it may only work for iOS8.
TestFlight can be used to test iOS apps on iPhone, iPad, and iPod touch running iOS 8 or later.
Does this mean there will not be testflight support for ios7 or ios6? Previously I loved testflight because I don't own an ios6 device or every size of iphone, but I have friends that do that can test them for me.
Is there a solution for sending a beta app to someone that is running ios6 or 7 (or even ios5)?
We switched from TF to another solution once they annonced they were not going to support Android any more. And now I see clearly that it was a very right decision.
Going back to your question. No, they don't support any iOS version older than iOS 8. So there are no chances to test on iOS 7 or iOS6 with TestFlight.
However, there are lots of solutions that provide biuld distribution for iOS 7 and older. Here are three the most useful and stable:
In our company we use Ubertesters today by 3 reasons:
However, it's a very personal point of view, so you might wish to make a quick research on all 4 solutions and find what exactly suits your development and testing needs.