It worked on my 4s, but only crashes when I try to open the details for my current location on my 6+. Update coming soon?
Addendum: I emailed the Vela Design Group today and they answered me today that a fix was in the works for release before the end of 2014. "Today," btw, was Christmas Day. Changing my rating to 5 stars.
Don in Frisco about VelaClock Sun/Moon