This is an application using Nearby Interaction announced by WWDC20 Compare each others interests with the same Wi-Fi environment, or Peer-to-Peer Wi-Fi or Bluetooth with nearby peripherals through Multipeer Connectivity. After that, when there are more than three items of interest that match, the app user is notified by vibration, and when two people cross their smartphones closely, a common keyword appears in modal format.
2PAD Inc.