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Best Smart Door Locks for Home Security
The best smart door lock for most homes is a retrofit deadbolt that keeps your existing exterior key cylinder: it avoids changing the outside hardware while adding app, keypad, or voice-assistant access. Choose a full-replacement lock instead if you want a built-in keypad or fingerprint reader, and first confirm that the lock fits your door and deadbolt.
Compare the leading options
These models suit different installation and access needs. Battery life varies with lock use, Wi-Fi activity, temperature, and battery quality; treat manufacturer estimates as planning figures, not guarantees. Check the current model’s specifications before buying, since versions and included connectivity hardware can differ.
| Lock | Installation and deadbolt | Access methods | Connectivity and battery | Emergency entry |
|---|---|---|---|---|
| August Wi-Fi Smart Lock (4th generation) | Retrofit interior unit; designed to turn a compatible single-cylinder deadbolt from inside. Retains the existing exterior key. | App, auto-unlock, and compatible voice assistants; keypad sold separately. | Built-in Wi-Fi; four CR123 batteries, with a stated battery life of up to six months. | Use the existing key; replace batteries from inside the door. |
| Schlage Encode | Full deadbolt replacement; fits standard single-cylinder deadbolt preparations. Requires door-edge and bore-hole compatibility checks. | Keypad code, app, physical key, and compatible voice assistants. | Built-in Wi-Fi; one 9V battery, with Schlage estimating up to six months. | Physical key and 9V battery terminals for temporary emergency power when the internal battery is depleted. |
| Yale Assure Lock 2 with Wi-Fi | Full replacement; offered in keyed and key-free configurations. Verify the selected trim and door prep. | Keypad, app, and compatible voice assistants; some versions offer a fingerprint reader. | Wi-Fi depends on the selected version or module; battery count and life vary by configuration. | Keyed versions retain a key cylinder; key-free models do not. Confirm the exact version’s backup-power method before purchase. |
| Level Lock+ | Retrofit-style mechanism installed inside the door; compatible deadbolt and cylinder requirements apply. Keeps a conventional exterior appearance. | App, physical key, and Apple Home Key on compatible Apple devices. | Bluetooth and Apple home connectivity; one CR2 battery, with a stated life of up to one year. | Use the existing key; access features may be limited if the battery is exhausted and the phone is unavailable. |
| Ultraloq U-Bolt Pro WiFi | Full replacement deadbolt; installation requires a compatible deadbolt bore and door thickness. | Fingerprint, keypad, app, physical key, and compatible voice assistants. | Built-in Wi-Fi; four AA batteries, with life dependent on settings and usage. | Physical key; keep a spare key accessible outside the home. |
Choose by door, household, and routine
| Your situation | Best fit | Why |
|---|---|---|
| Want smart access without replacing the outside hardware | August Wi-Fi Smart Lock or Level Lock+ | Both are interior retrofit approaches that preserve a conventional exterior keyway. Check clearance around the thumbturn and interior trim. |
| Need straightforward keypad entry and a physical key | Schlage Encode | Its keypad and key cylinder provide independent ways in if a phone is dead or unavailable. |
| Several household members need hands-free or quick entry | Ultraloq U-Bolt Pro WiFi or an appropriate Yale Assure Lock 2 configuration | Fingerprint access can reduce code sharing, but confirm the exact model includes the reader you want and consider how it behaves with wet or dirty fingers. |
| Prefer fewer battery changes and already use Apple devices | Level Lock+ | Its stated battery life is up to a year and Apple Home Key can simplify entry. It is less appealing if you need built-in Wi-Fi or broad platform flexibility. |
| Rent, or may need to restore the original hardware | Interior retrofit lock | It generally avoids replacing the exterior cylinder, but get the owner’s permission and retain the original parts. |
Check compatibility before ordering
“Fits a standard deadbolt” is not a guarantee that a particular lock will fit your door. Most smart deadbolts are intended for a single-cylinder setup: a key outside and a thumbturn inside. Double-cylinder deadbolts, unusual mortise locks, and multipoint door systems often need a different solution.
- Measure door thickness and the diameter of the deadbolt bore, then compare them with the exact model’s installation guide.
- Check the backset: the distance from the door edge to the center of the deadbolt hole. Common measurements are 2⅜ inches and 2¾ inches, but do not assume your door uses either.
- Confirm the deadbolt’s shape and dimensions, and whether the interior thumbturn has enough clearance from the handle, trim, glass, or wall.
- Before installing, test the existing bolt with the door open. It should extend and retract smoothly without pushing or pulling the door.
A misaligned strike plate is a frequent cause of poor smart-lock performance. A motor that struggles to throw the bolt uses more power and may jam or fail to lock. Adjust the door or strike alignment before blaming the electronics; do not rely on the motor to force a stiff bolt into place.
Connectivity and backup access are separate decisions
Bluetooth can handle nearby phone control, while Wi-Fi enables remote access without a separate bridge on models with built-in Wi-Fi. A hub-based system can reduce the lock’s direct Wi-Fi demands but adds another device to configure and keep online. Matter support, Apple Home Key, and voice-assistant compatibility are model- and ecosystem-specific, so verify them rather than inferring them from a brand name.
Plan for a lockout before it happens. A keyed model gives you a mechanical fallback, but only if a spare key is available somewhere other than inside the locked home. Key-free models remove that option: check their specified low-battery warning and emergency-power method, and store the instructions where household members can find them. Emergency power may wake the keypad or electronics; it does not necessarily replace the battery.
Battery life: plan for use, not the headline number
Manufacturers commonly state battery life in months or up to a year, but real runtime depends on how often the lock moves, signal strength, temperature, and settings. A busy household that locks and unlocks the door repeatedly can use batteries faster than a lightly used entry. Weak Wi-Fi or a door that makes the bolt motor strain can also increase power demand.
Enable low-battery notifications where available, keep the recommended battery type on hand, and replace batteries promptly rather than waiting for the lock to stop responding. Avoid mixing old and new batteries or combining different battery chemistries. After a change, test the keypad, app, and backup key while the door is open.
Installation and ownership realities
Most standard deadbolt replacements can be installed with a screwdriver, but careful alignment matters more than speed. Follow the model’s template and instructions, install the bolt in the correct orientation, and pair the lock before closing the door. Then test locking and unlocking with the door open and closed, using every access method your household expects to rely on.
Over time, batteries and keypad surfaces are the likely routine maintenance items. Clean the exterior with a soft, lightly damp cloth and follow the manufacturer’s care instructions; avoid spraying liquid into the keypad or electronics. Keep the bolt and strike area free of debris, and investigate new resistance promptly. Repeatedly forcing a sticky door can wear the motor and drain batteries sooner.
For most buyers, a keyed full-replacement lock is the sensible choice when keypad entry and a dependable physical fallback matter. Pick a retrofit lock if preserving the exterior hardware is the priority. Before committing, verify door measurements, your preferred smart-home connection, the actual battery setup, and a workable way to enter during a dead battery or network outage.
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