The SwitchBot Lock Ultra costs $140. An adapter kit may be needed for some locks (such as mine) that costs an additional $20.

Level’s “invisible” lock lives up to its promise, giving any deadbolt smart features with no change to your exterior hardware.

It’s a cliche that inventing good software is easy, while creating good hardware is almost impossible. The reason seems simple enough: Software can always be updated, but hardware can’t change once ...