Airguard is an open source app that can detect both Tiles and Airtags in the background: https://play.google.com/store/apps/details?id=de.seemoo.at_tracking_det

Airguard is an open source app that can detect both Tiles and Airtags in the background: https://play.google.com/store/apps/details?id=de.seemoo.at_tracking_detection.release https://play.google.com/store/apps/details?id=de.seemoo.at_t... Works quite well, has notified me of tags that are on a train with me quite a few times.