Privacy

Six dollars a month here, twenty there, a five-dollar add-on you forgot about — across a portfolio it becomes a hundred a month per door, charged forever, to use hardware you already bought. Here's the math, and the fix.

A home-health aide, a cleaner, a sibling, a physical therapist — when a parent ages in place, a small crowd needs a way in. A smart lock replaces the junk drawer of keys with codes you control from your phone....