I use Phone Buddy, it monitors your home wifi, so you can set it if u forget your phone or your watch, on or the other. When you loose the signal the device you have will alert you. So I can get 40meters from home and the device I have with me will alert me. The one bug that I’m going to write them about is that it screws with my sleep focus. So I have to be sure it’s not enabled before I go to sleep. My watch was not dimming and my sleep was not tracked at night and I tracked it back to that app after contacting Apple support.