Sensors & context
Motion, steps, location snapshots, battery, and other phone signals (with consent) so watchers see more than a last check-in time.
Watching, not waiting for a tap
Checks and phone signals do the quiet work. Buttons are there when you need them—not the whole story.
Checks & overdue
Set a daily “I’m OK by…” or similar. If it’s missed, people who watch them see overdue and get a push—without anyone hunting for the phone.
Help when it isn’t quiet
One action alerts everyone watching you. It notifies your circle—it does not call 911 or any dispatcher.