UniKey

The Kwikset Kevo looks like any other lock. There's a place for a physical key, and it's double bolted onto the door. You don't need to call a specialist to install it. You can still unlock the door from the inside by turning a knob. But unlike a traditional lock, this lock uses proximity to unlock doors. The lock operates via iPhone or iPad app, or a fob for people without smart phones. When the mobile app or fob are nearby and you touch the lock, it turns blue then green to signal it is unlocked. If you tap the lock three times, it turns yellow and locks again. If you don't have access to a door and you touch it, the lock turns red. You don't have to be touching the app or fob to lock and unlock doors. The devices just need to be within range. You can set the range to either a few inches or a few feet via the app or website.

UniKey's technology knows which side of the door the owner is on, so being too close to the lock from the inside won't let a nearby stranger in. There's no pin required to access the mobile app key or button that needs to be toggled. You just enroll your device(s) once. Hackers aren't really a worry either, because UniKey scrambles together new key codes all the time. If you lose your smartphone with the the app, you can turn off access on via the website. Otherwise, access will turn off on the old device as soon as you activate a new phone.

The best feature is the ability to share permanent or temporary keys with others via mobile app. For eg, you could assign a key to a house cleaner for a specific day each week, or let a construction worker use a key for a few hours each day. Family members can get their own mobile copies. Keys can be cancelled as quickly as they can be created on the app.