Smart Locks Explained: Keypad, Fingerprint, or Bluetooth?

Smart locks have moved well beyond the novelty stage. Today they're a practical upgrade that solves real problems — giving the dog walker temporary access, eliminating the panic of lost keys, and knowing exactly when the kids get home from school. But with three primary access methods available, choosing the right type matters more than choosing the right brand.

Keypad Smart Locks

Keypad locks use numeric codes for entry, typically on a touchscreen or physical button pad mounted on the exterior.

Best for: Rental properties, Airbnb hosts, families with children, anyone who shares access frequently. Codes can be created, scheduled, and revoked remotely without physical interaction.

Considerations: Codes can be observed (shoulder surfing), and touchscreens show fingerprint smudges that reveal frequently used digits. Look for models with scramble-pad features that randomize number positions. Battery life is generally excellent since keypads draw minimal power — expect 6 to 12 months from standard batteries.

Fingerprint Smart Locks

Biometric locks use capacitive fingerprint sensors, similar to what's on your smartphone, to authenticate users by their fingerprint.

Best for: Primary residences where the same people enter daily. Nothing to remember, nothing to carry, nothing to share. Most models store 50 to 100 fingerprints, covering family members and frequent visitors.

Considerations: Wet, dirty, or very cold fingers can cause recognition failures. Sensor quality varies dramatically between brands — cheap sensors have false rejection rates above 3%, while premium sensors like those from Aqara and Eufy achieve sub-0.5% rejection. Always buy a biometric lock that includes a backup entry method.

Bluetooth and Phone-Based Locks

These locks authenticate via your smartphone, using Bluetooth proximity or NFC. Some unlock automatically when they detect your phone approaching (auto-unlock), while others require tapping a button in an app.

Best for: Tech-savvy individuals who always have their phone, and those who want the sleekest hardware with no visible keypad or sensor.

Considerations: Auto-unlock relies on Bluetooth ranging, which can be imprecise. Some users report doors unlocking when they walk past without intending to enter, or failing to unlock until they stand directly in front of the door for several seconds. Battery drain on your phone is minimal but present. Sharing access requires the other person to install an app.

Our Recommendation

For most households, a combination lock that offers all three methods provides the best experience. The Aqara U200, Schlage Encode Plus, and Yale Assure Lock 2 all offer keypad, app, and either fingerprint or key backup. This redundancy means you're never locked out because one method fails.

Whatever you choose, prioritize locks with ANSI Grade 2 or higher certification, AES-128 encryption for wireless communication, and a physical key override for emergencies. A smart lock should make your door more convenient without making it less secure.