thanks!Rising Card! One of the first magic apps for iPhone, and actively maintained to work with the latest iOS.
https://apps.apple.com/us/app/rising-card-magic-trick/id324247209
That's a fantastic presentation! I love David Williamson.Not an app, but David Williamson showed how he uses a hot rod routine underneath a spectator's iPhone while it is on camera mode to show how the colors work with the photo filters...ha. It was great. Also use caution when using too much technology with phones during magic performances. You don't want over kill or spectators will just say, "Oh..neat app." Just FYI.