This app was mentioned in 2 comments, with an average of 1.50 upvotes
LinkMe: Wave Wave.
EDIT: Bot got it wrong. I was linking to this: https://play.google.com/store/apps/details?id=com.noodlecake.wavewave&hl=en
Wave Wave? https://play.google.com/store/apps/details?id=com.noodlecake.wavewave