August Home has been refining its smart lock design for years. The third-generation Smart Lock is the cleanest version yet, a compact dark gray disc that fits over your existing deadbolt on the inside of the door. This approach means you keep your current keys and hardware, a major advantage for renters or anyone who wants a simpler installation.

It operates primarily via Bluetooth from your smartphone, automatically locking the door behind you and unlocking as you approach. The 4.8-inch diameter unit is unobtrusive, and the all-metal construction feels solid. Battery life is reliable, typically lasting several months on four standard AA batteries. You’ll need to be within Bluetooth range for the auto-unlock feature to work, which is perfect for securing a home but doesn’t offer remote access on its own.

For a straightforward, modern upgrade to a traditional lock, it’s a compelling choice. The setup is tool-free and takes about ten minutes. Just know that for full remote control, you’ll need to add August’s separate Wi-Fi Connect bridge.