Nostrville is on @Comingle, if you have iOS device check it out on AppStore
It’s not actually integrated with Nostr (yet) but I hacked it out as a proof of concept and to provide an easy way to zap sats to speakers, organizers, and volunteers at #Nostrville Enjoy and I’ll take any and all feedback. https://testflight.apple.com/join/aqJJUe4m