https://play.google.com/store/apps/details?id=com.pof.android

 

Haven't dated in years but if I wanted to, I'd look for an app that doesn't use models in their advertisements.

 

That will narrow the market significantly

As always with a "best" question I find myself asking "define best"? Different people will have different requirements, and so I'm sure different apps will suit different people better than others. Heck, I'm sure that many will be different depending on what country you are in (which we don't know).