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Pro Personal unlock codes
You can give out personal codes which will unlock the door, and you can have an unlimited number of these codes. However, if you don't have the optional wireless keypad ($79) each user will need to download the app and enter their code there. These codes can be configured to have a time duration where they will expire, or they can be permanent.
Pro Doesn't change the outward appearance of your door
This smart lock is installed only on the inside of your door, and doesn't replace your existing lock. This means that you keep your current keys, and installation is a bit easier as you don't have to disassemble your door.
Pro Detailed history available
Every time the door locks or unlocks, it will record the data in a logbook. This entry includes who performed the action, and there is space to write a note as well if you wish.
Pro Compatible with Nest devices
This is one of the few products that works with both Apple's HomeKit and Google's Nest devices. For example, when you unlock your door it can automatically trigger the Nest thermostat to turn on, and the Nest cam to turn off.
Pro Automatic locking an unlocking
This lock has enough smarts to automatically lock and unlock. Depending on your settings, you can set it to unlock automatically when it detects your phone is near, and automatically lock a few seconds after you leave.
Con Wi-Fi requires additional hardware
With just the Smart Lock itself, the range is limited to Bluetooth, which means you need to be physically close to the lock. To control your lock using Wi-Fi (range is unlimited as long as you have internet access), you will need to purchase additional hardware (August Connect which costs $79, or an Apple TV which costs $99). These act as an in-between device, using a bluetooth signal to communicate with the lock and using Wi-Fi to connect with your phone.
Con Lacking extras
While the Schlage Sense includes a numberpad, and an alarm, the August Smart Lock doesn't come with any extra features in the box.