Your front door lock is an unsung hero, quietly standing guard to keep thieves and rogues at bay. Smart locks are the superheroes of the species, with special powers that make life more convenient (and a little more fun). Most smart locks come in one of two styles: a deadbolt replacement or a deadbolt adapter (which replaces the thumb turn with a motorized one). We strongly prefer deadbolt replacements, and we recommend the keypad deadbolt lock ZN2110 SERIES, a classical, attractive, easy-to-learn model that you can trigger in multiple ways, including by password or keys. If you can’t replace your entire lock or don’t want to, the one with handle lock set has sturdy, reliable hardware and software, offers a good-looking design, and is as smart as or smarter than many competing locks, all for about half the price.