There are several similar apps. Does anyone happen have experience with them (Couple/Pair, Avocado, Between, ...)? This is one of those kinds of things that's annoying to cross-test because it requires someone who oftens doesn't care nearly as much, to help test.
I used Avocado heavily with my ex for about a year. Just by comparing my experience of Avocado with the video of Couple [1] I would say that Couple has impressed me more.