Key takeaways
- Confirm that the door has a single-cylinder deadbolt, not a mortise lock, interconnected lock, multi-point lock, or rim cylinder.
- Check that the hole diameter and edge bore match the installation template.
- Ensure the deadbolt faceplate and strike are not unusually narrow or decorative.
- Test the existing bolt with the door open. It should move fully with light thumb pressure.
- Check clearance behind the door for the interior battery housing.
The best smart locks for most homes are the Schlage Encode Plus for dependable built-in Wi-Fi, the Yale Assure Lock 2 for broad deadbolt compatibility, and the Aqara U100 for households that want fingerprint entry and Apple home-key support.
Best smart locks at a glance
| Lock | Best for | Installation requirement | Access methods | Power and emergency entry | Smart-home support |
|---|---|---|---|---|---|
| Schlage Encode Plus | Most households | Replaces a standard single-cylinder deadbolt; no separate hub | Keypad, physical key, app, Apple home key, voice control | 4 AA batteries; physical key and emergency exterior contacts | Apple Home, Alexa, Google Home |
| Yale Assure Lock 2 | Flexible configurations | Replaces compatible deadbolt; module determines wireless protocol | Keypad, app, optional keyway, voice control | 4 AA batteries; 9-volt emergency contact on key-free versions | Varies by module: Bluetooth, Wi-Fi, Z-Wave, or Matter-compatible options |
| Aqara U100 | Keyless entry and Apple households | Fits many US single-cylinder deadbolts; check backset and door thickness | Fingerprint, keypad, NFC card, app, physical key, home key | 4 AA batteries; USB-C emergency power and key override | Apple Home, Alexa, Google Home, Matter through a compatible Aqara hub |
| August Wi-Fi Smart Lock | Renters and existing keys | Installs over the inside thumb-turn; existing exterior lock remains | Existing key, app, auto-unlock, optional keypad, voice control | 2 CR123 lithium batteries; exterior key remains available | Apple Home, Alexa, Google Home |
| Level Lock+ | Discreet appearance | Replaces the interior lock mechanism and deadbolt; precise alignment required | Key, app, keypad accessory, Apple home key, key card depending on setup | 1 CR2 lithium battery; physical key and exterior contacts | Apple Home, Alexa, Google Home, Matter through supported setups |
Battery figures are typical manufacturer estimates, not guarantees. Heavy use, weak wireless signals, cold weather, and frequent motor resistance can shorten runtime substantially.
Our picks by buying situation
Choose the Schlage Encode Plus for the simplest all-round installation
The Encode Plus is a strong choice when you want a conventional exterior keypad, a physical key backup, and remote access without buying a separate hub. It is designed for common US single-cylinder deadbolt preparations and is available in versions with built-in Wi-Fi. Apple users can also use a compatible iPhone or Apple Watch as a home key.
Its main trade-off is size. The interior housing is larger than a traditional thumb-turn, and four AA batteries take more space than the single-cell design used by some premium locks. Wi-Fi convenience also means faster battery consumption than a Bluetooth-only lock. Use it when remote locking, guest codes, and straightforward setup matter more than a minimalist interior.
Choose the Yale Assure Lock 2 when configuration flexibility matters
The Assure Lock 2 is best viewed as a lock family rather than one fixed product. Some versions retain a keyway, while key-free versions use a keypad and emergency 9-volt contacts. Wireless capabilities depend on the installed module, so check the exact model before purchasing. A Bluetooth-only configuration can be efficient, while a Wi-Fi module adds remote access and a Z-Wave version may suit an existing home-automation hub.
This modular approach is useful if your smart-home platform may change. It also creates the biggest buying risk: two Assure Lock 2 listings can look similar while supporting different ecosystems. Confirm whether the box includes Wi-Fi, which hub is required, and whether the lock fits your existing deadbolt rather than assuming all versions install identically.
Choose the Aqara U100 for fingerprint access and multiple entry methods
The U100 offers more ways to enter than most conventional smart deadbolts: fingerprint recognition, numeric codes, NFC cards, app control, a physical key, and Apple home key support. That makes it particularly practical for families, short-term guests, or anyone who dislikes carrying keys.
Its fingerprint reader is convenient, but it should not be the only access method. Wet, dirty, or injured fingers may not authenticate reliably, and children’s fingerprints can be less consistent. The U100 also benefits from a compatible Aqara hub for some remote and Matter features. Without the appropriate hub or network setup, its local access features still work, but the smart-home experience may be narrower.
Choose the August Wi-Fi Smart Lock if preserving the outside lock is important
August is the least disruptive option for many renters and older homes because it replaces the interior thumb-turn while leaving the exterior cylinder and key untouched. Installation is often easier than replacing the complete deadbolt, provided the existing mechanism is compatible and turns smoothly by hand.
That advantage comes with limitations. The exterior appearance does not change, so there is no built-in keypad unless you add one. The motorized interior unit is also relatively prominent. If your current deadbolt binds, sits out of alignment, or requires force to turn, August will inherit that problem rather than solve it.
Choose Level Lock+ for a nearly invisible exterior
Level Lock+ hides most of its electronics inside the door and deadbolt, preserving a conventional-looking interior and exterior. It is appealing when visual design, Apple home key access, and a compact footprint matter more than a built-in keypad.
Compact hardware leaves less room for installation error. The bolt must slide cleanly into the strike without pressure, and the door should remain aligned in both summer and winter conditions. Level is a poor choice for a door that already needs lifting, pushing, or pulling to lock. A conventional keypad lock is more forgiving when multiple household members need code entry.
Deadbolt compatibility: check these measurements first
Before comparing apps, measure the door. Most residential smart deadbolts expect a door roughly 1-3/8 to 1-3/4 inches thick, although exact limits vary. Measure the backset—the distance from the door edge to the center of the lock hole—as many locks support 2-3/8 inches and 2-3/4 inches, but not every model supports both in every configuration.
- Confirm that the door has a single-cylinder deadbolt, not a mortise lock, interconnected lock, multi-point lock, or rim cylinder.
- Check that the hole diameter and edge bore match the installation template.
- Ensure the deadbolt faceplate and strike are not unusually narrow or decorative.
- Test the existing bolt with the door open. It should move fully with light thumb pressure.
- Check clearance behind the door for the interior battery housing.
A lock that fits the hole but requires force to operate is not a successful installation. Motor resistance raises noise, increases battery drain, and can cause incomplete locking.
Security features that matter more than marketing language
Look for a strong mechanical deadbolt, a protected cylinder, tamper alerts, automatic relocking controls, and a way to review access history. A keypad should resist casual code discovery, and temporary codes should be easy to revoke when a cleaner, contractor, or guest no longer needs access.
Do not treat Wi-Fi as a security grade. Wireless convenience determines how you manage the lock remotely; it does not replace a sound door, a properly installed strike, or a high-quality deadbolt. Enable two-factor authentication on the lock account, use unique passwords, install firmware updates, and remove old guest codes.
Smart-home compatibility also has layers. A lock may work locally with Bluetooth, remotely through its own Wi-Fi bridge, and with a platform such as Apple Home or Google Home through a separate hub. Matter can improve cross-platform control, but a Matter-compatible setup may still require a border router or manufacturer hub for remote access and advanced functions.
Battery life and emergency entry
A useful ownership calculation is to estimate annual battery spending from the battery count and replacement interval. If a four-AA lock uses one set every six months and rechargeable cells are not recommended by the manufacturer, that is about eight disposable batteries per year. A two-CR123 design may use fewer cells but cost more per replacement. The cheapest lock to operate is not automatically the one with the fewest batteries; motor friction and Wi-Fi activity often matter more.
Every household should decide what happens when the batteries die. Physical keys are the simplest backup. Keypad locks without keyways may use exterior 9-volt contacts, USB-C emergency power, or another manufacturer-specific method. Store the emergency procedure in your password manager or household documentation, and test it before an actual outage. Do not wait until the lock is dead to discover that the emergency terminals are hidden behind a cover.
Installation and maintenance mistakes to avoid
- Install the lock with the door open and verify the bolt extends and retracts completely.
- Pair the lock before tightening decorative covers or routing cables permanently.
- Calibrate only after the mechanical alignment is correct; calibration cannot fix a dragging bolt.
- Set a low-battery warning and keep the correct replacement batteries available.
- Clean the keypad with a slightly damp, non-abrasive cloth; avoid spraying liquid into the housing.
- Inspect the strike screws periodically. A loose strike can make a formerly quiet lock grind or stall.
The parts most likely to show wear are the keypad surface, battery contacts, thumb-turn mechanism, and strike alignment—not the app. If the door begins sticking, correct the hinges or strike before blaming the smart lock.
Final buying recommendation
Buy the Schlage Encode Plus if you want a complete, widely understood package with built-in Wi-Fi. Pick the Yale Assure Lock 2 if you need to match a particular hub or want a choice between keyed and key-free versions. Choose the Aqara U100 for fingerprint and NFC access, August for preserving an existing exterior key, and Level Lock+ when discreet hardware is the priority.
Whichever model you choose, verify the door measurements, plan an emergency-entry method, and select the wireless ecosystem before buying. Those practical details determine whether a smart lock remains convenient after the novelty wears off.
