Show HN: I made an app for initiating social activity

It's basically an app for saying "I'm ready" or "Let's do x...". Background is that my friend group plays video games, grabs beer or whatever - and a lot of the communication revolves around logistics. This app lowered the threshold for initiating. We create a group per activity, and "going green" means you're ready. The other group members get a push notification "Paul is greenlit!" and the title of the group is "Play Dota 2" or "Beer at local pub". Super simple concept, but it actually works.

TLDR; I made an app that let's you press a button instead of writing the typical "Does anyone want to join x activity?"

Currently iPhone only.