Couple hookup app

I want to share a couple hookup app with you guys here.
I'm in a committed relationship, but I'm long for a new kind of dating. It doesn't mean I'm unsatisfied with my present relationship. I'm honest to my girlfriend, and we trust each other. Couple hookup is a dream of us.  My favorite couple hookup app is 3rder, I knew it from my friends. I always think that a great dating app is worth sharing. It is available for IOS and android.
The reason why I choose this dating app is that I can easy meet singles who are interested in couple dating in my city.