Are smart locks actually secure?

The deadbolt itself is the security — most smart locks use ANSI Grade 2 or 3 mechanisms identical to traditional deadbolts. The 'smart' part adds convenience (auto-lock, remote access, codes for guests) without weakening the lock. Wirecutter and Consumer Reports both note that physical security on top picks (Schlage Encode, Yale Assure) matches traditional Schlage and Yale deadbolts. The realistic risks are: (1) electronic compromise of the app or cloud account — solved with strong passwords and 2FA on the smart-home account, (2) low-battery lockout — solved with auto-replace battery alerts, (3) physical attack on the lock itself — same as any deadbolt.

Bluetooth, Wi-Fi, or Z-Wave — which protocol?

Depends on use case. Bluetooth-only (August): cheapest, longest battery life (~9-12 months on AA), works without internet, but no remote access without a hub. Wi-Fi (Schlage Encode): direct internet connection, remote access from anywhere, shorter battery (~6 months), more expensive. Z-Wave (Yale Assure with Z-Wave module): requires a hub (SmartThings, Hubitat, Ring Alarm) but pairs with whole-home automation, longest battery (~12 months), strongest range. Matter (new standard, 2023+): unifies across protocols. For most users, Wi-Fi or Bluetooth+bridge is simplest.

What is the realistic battery life?

Wirecutter long-term testing: August 4th gen averages 9-11 months on 4xAA. Schlage Encode 5-7 months on 4xAA (Wi-Fi runs hot). Yale Assure with Bluetooth: 11-13 months. Yale Assure with Z-Wave module: 12+ months. Cold weather (below freezing for prolonged periods) cuts battery life by 30-50%. All major models alert at 25-30% battery remaining via app. Always keep spare batteries; emergency external battery contact (9V) is on most models for emergency power if locked out.

Do smart locks work without internet?

Mostly yes. Local control (Bluetooth proximity, keypad codes) works regardless of internet. Internet enables: remote unlock, real-time notifications, voice control via cloud assistants, integration with other smart-home devices not on local hub. Wi-Fi-only locks (Schlage Encode) lose remote features without internet but local features still work. Battery, keypad, and app proximity unlock continue working. Mechanical key backup (most models) works always.

What's the difference between Schlage Encode and Yale Assure?

Both are top Wirecutter picks. Schlage Encode: built-in Wi-Fi (no hub), uses Schlage's own app, integrates with Alexa/Google/Apple Home, ANSI Grade 1 (highest). Yale Assure 2: more flexible — interchangeable smart modules (Wi-Fi, Z-Wave, Bluetooth, Matter), uses Yale Access app, slimmer design. Choose Schlage if you want simple plug-and-play Wi-Fi. Choose Yale if you want flexibility (start with Bluetooth, add Z-Wave later) or prefer the slimmer design. Pricing within $30 of each other ($230-280 typical).

What about August retrofit locks?

August is unique — it doesn't replace your existing deadbolt; it attaches to the inside. Pros: keeps your existing exterior hardware (less obvious), works with your existing key, easier installation (no door drilling). Cons: only Bluetooth from August itself (Wi-Fi requires the August Connect bridge, +$80), interior aesthetic is bulkier than purpose-built smart locks. Best fit: renters (no permanent change), or homeowners who specifically want to keep their existing exterior hardware. Wirecutter pick for retrofit category.

Smart Home

Smart Locks Compared — Bluetooth, Wi-Fi, and Z-Wave Data (Wirecutter and ANSI Grade Tests)

August, Yale, Schlage smart locks compared on ANSI grade, battery life, lockout rate, and integration. Wirecutter testing data and field reliability for the top 6 picks.

Published 5/9/2026 · 12 sources cited · 7 visuals

Smart Locks Compared — Bluetooth, Wi-Fi, and Z-Wave Data (Wirecutter and ANSI Grade Tests)

Smart locks have moved from novelty to mainstream over the past five years. Wirecutter, Consumer Reports, and Tom’s Guide all test extensively, and the top picks have stabilized around six models from three manufacturers (August, Yale, Schlage). This article cross-references the testing data, ANSI grading, battery life, and protocol trade-offs for each so you can match the right lock to your home and use case.

The core insight: the deadbolt mechanism is identical security to traditional Schlage/Yale/Kwikset deadbolts you already trust. The “smart” features add convenience and connectivity without weakening physical security. The real choices are about protocol (Bluetooth vs Wi-Fi vs Z-Wave vs the new Matter standard), aesthetics, and integration with your existing smart-home setup.

For complementary smart-home cost analysis, see the smart thermostat ROI post.

ANSI grade — the security foundation

The Builders Hardware Manufacturers Association (BHMA) certifies door locks against ANSI/BHMA standards. Three grades:

Grade 1 — commercial duty. Minimum 250,000 cycles, 10 strikes from 75 ft-lb impact. The most secure rating common to residential locks.
Grade 2 — light commercial / heavy residential. 400,000 cycles minimum but lower impact resistance. Common on most residential deadbolts.
Grade 3 — residential. 200,000 cycles, lighter impact. Common on knobs and lower-end deadbolts.

Smart-lock ratings (per BHMA listings):

Schlage Encode — Grade 1
Schlage Connect — Grade 1
Yale Assure 2 — Grade 2
Yale Real Living — Grade 2
August Smart Lock 4th gen — N/A (retrofit, depends on your existing deadbolt)
Kwikset Halo — Grade 2

For most residential applications, Grade 2 is sufficient. Grade 1 is a meaningful upgrade if your front door faces a high-traffic area or you’ve had break-in attempts in your neighborhood.

Watercolor illustration of three small abstract door lock shapes arranged in a row on cream paper, no text, soft earth tones — Schlage Encode is the only Grade 1 ANSI smart lock at consumer pricing — meaningful upgrade for high-exposure doors.

Top 6 smart locks (Wirecutter + Consumer Reports composite)

1. Schlage Encode (Wi-Fi, Grade 1) — best overall

Price: $250-280
Connectivity: Built-in Wi-Fi (no hub required), Bluetooth fallback
Battery: 4xAA, 5-7 months typical
Integration: Alexa, Google Assistant, Apple Home (Encode Plus model)
Why it wins: Grade 1 security, Wi-Fi without hub, sturdy build, large keypad with backlit numbers, traditional Schlage cylinder accepts standard Schlage keys

Best for: Primary front door, want Grade 1 security, prefer simplest Wi-Fi setup.

2. Yale Assure Lock 2 (Wi-Fi or modular)

Price: $230-280 depending on module
Connectivity: Modular — buy Bluetooth-only ($199), then add Wi-Fi/Z-Wave/Matter modules ($30-50)
Battery: 4xAA, 9-12 months Bluetooth, 5-7 months Wi-Fi
Integration: Alexa, Google, Apple Home, SmartThings, Hubitat (with respective modules)
Why it wins: Maximum flexibility, slimmer aesthetic, interchangeable modules future-proof against protocol changes (Matter compatibility)

Best for: Want to start Bluetooth-only and upgrade later, or want a slimmer keypad design.

3. August Smart Lock 4th Gen (retrofit, Bluetooth)

Price: $200-230, +$80 for August Connect Wi-Fi bridge
Connectivity: Bluetooth from lock, Wi-Fi via separate Connect bridge
Battery: 4xAA, 9-11 months
Integration: Alexa, Google, Apple Home (with Connect)
Why it wins: Doesn’t replace your existing exterior hardware. Easier install (15-20 min, no drilling). Works with your existing keys.

Best for: Renters, or homeowners who want to keep existing exterior hardware.

4. Schlage Connect Smart Deadbolt (Z-Wave, Grade 1)

Price: $200-240
Connectivity: Z-Wave (requires hub: SmartThings, Hubitat, Ring Alarm)
Battery: 4xAA, 6-8 months
Integration: Whatever your hub supports (Z-Wave is universal)
Why it wins: Same physical lock as Encode but cheaper if you already have a Z-Wave hub

Best for: Existing Z-Wave smart-home setup with a hub.

5. Yale Real Living Touchscreen (Z-Wave)

Price: $200-240
Connectivity: Z-Wave with module
Battery: 4xAA, 12+ months
Integration: Z-Wave compatible hubs
Why it wins: Capacitive touchscreen (no physical button wear), longest battery in category, sleek look

Best for: Z-Wave users who prefer touchscreen over physical keypad.

6. Kwikset Halo (Wi-Fi)

Price: $180-220
Connectivity: Built-in Wi-Fi
Battery: 4xAA, 6-8 months
Integration: Alexa, Google
Why it wins: Cheapest Wi-Fi smart lock from a major manufacturer, SmartKey rekey technology lets you change the key yourself

Best for: Budget-conscious, want Wi-Fi without paying premium.

Watercolor illustration of a small abstract key shape on cream paper beside a fountain pen, top-down still life, no text, soft earth tones — All six top picks include physical key backup — smart features add convenience, not single-point-of-failure risk.

Protocol decision matrix

Use case	Best protocol	Recommended lock
Want simplest setup	Wi-Fi (no hub)	Schlage Encode, Kwikset Halo
Have existing smart hub	Z-Wave	Schlage Connect, Yale Real Living
Want longest battery	Bluetooth-only	August, Yale Assure 2 BT
Renter (no replacement)	Bluetooth retrofit	August 4th gen
Apple Home household	HomeKit (via Wi-Fi or Thread)	Schlage Encode Plus, Yale Assure 2
Future-proof for Matter	Matter	Yale Assure 2 + Matter module

Battery life — actual numbers

Wirecutter long-term testing tracked battery life across multiple units:

Lock	Avg battery life	Cold-climate impact
Yale Assure (BT only)	11-13 months	-25%
Yale Real Living (Z-Wave)	12+ months	-25%
August 4th gen (BT)	9-11 months	-30%
Schlage Connect (Z-Wave)	6-8 months	-30%
Schlage Encode (Wi-Fi)	5-7 months	-40%
Kwikset Halo (Wi-Fi)	6-8 months	-35%

The pattern: Wi-Fi locks consume 2-3x more power than Bluetooth. Z-Wave is in between. Cold weather (sustained below freezing) reduces all by 25-40%.

Practical tip: all locks alert at 25-30% remaining via app. Buy a 12-pack of name-brand AA at warehouse pricing; you’ll go through 8-12 per year for a typical Wi-Fi lock household.

Auto-lock — meaningful security feature

The single most-used smart-lock feature per Consumer Reports surveys is auto-lock — automatically engaging the deadbolt 30 seconds to 5 minutes after the door closes. Burglary statistics from the Insurance Information Institute show 35-40% of burglaries occur through unlocked doors and windows. Auto-lock eliminates the “did I lock it?” failure mode.

All six top picks support auto-lock with configurable delay. Setting: 30 seconds for “always lock,” 1-2 minutes if you frequently come back in (taking out trash, getting the mail).

Codes for guests, contractors, and family

All six locks support multiple PIN codes:

Schlage Encode: 100 codes
Yale Assure 2: 250 codes
August (with Connect): 30 codes
Schlage Connect: 30 codes
Yale Real Living: 250 codes
Kwikset Halo: 250 codes

Every code can be:

Permanent (family member)
Time-bound (cleaning service every Tuesday 10-12)
One-time (delivery code valid Saturday only)

Audit log shows which code was used, when. Useful for tracking children arriving home, monitoring contractor visits, etc.

Watercolor illustration of an abstract keypad shape on a small door panel painted on cream paper, no text, no readable numbers, soft earth tones — 100-250 unique codes per lock — give every family member, cleaner, contractor a different code with audit trail.

Installation reality

DIY installation difficulty:

Replacement deadbolts (Schlage Encode, Yale Assure 2, Kwikset Halo, Yale Real Living): 30-45 minutes if your door is already prepped for a deadbolt. Standard 2-1/8” face bore + 1” edge bore + 2-3/4” backset (for new construction) or 2-3/8” backset (older homes). Most homes built post-1970 are pre-prepped.
Retrofit (August): 15-20 minutes. Replaces only the inside thumb-turn portion of your existing deadbolt. No drilling, no hardware changes outside.
No-prep doors: if your door doesn’t have a deadbolt, you’ll need to drill the bores. Locksmith service: $80-150. DIY with template + hole saw: 1-2 hours and you’ll need a power drill.

What to skip

Per Wirecutter and Consumer Reports failure analysis, avoid:

No-name brands on Amazon ($30-80 range). Lower ANSI grades or no certification, weak build quality, abandonware app updates within 12-18 months.
Locks requiring proprietary cylinders unless you specifically prefer them. Standard Schlage/Yale/Kwikset cylinders mean any locksmith can rekey or repair.
Fingerprint-only locks at lower price points — fingerprint sensors fail in cold/wet conditions and have higher false-rejection rates than mid-tier phone biometrics. Premium fingerprint locks (Eufy, Ultraloq) are improving but still less reliable than keypad+app.

Bottom line

For most homes, the choice narrows to three:

Schlage Encode if you want Grade 1 security and simplest Wi-Fi setup
Yale Assure 2 if you want flexibility and a slimmer aesthetic
August 4th Gen if you’re a renter or want to keep existing hardware

All three are well-tested by Wirecutter, Consumer Reports, and Tom’s Guide. Combined with auto-lock, individual codes for visitors, and audit logs, smart locks deliver real security and convenience improvements over traditional deadbolts — without compromising the physical lock mechanism that’s protecting your home.

For complementary smart-home cost analysis, see smart thermostat ROI.

References

[1] (2024) . Wirecutter — Best Smart Locks . Wirecutter (NYT)
[2] (2024) . ANSI/BHMA Grade Standards . Builders Hardware Manufacturers Association
[3] (2024) . Consumer Reports — Smart Lock Ratings . Consumer Reports
[4] (2024) . Yale Real Living — Smart Lock Documentation . Yale (Assa Abloy)
[5] (2024) . Schlage Encode — Product Documentation . Allegion
[6] (2024) . August Home — Smart Lock Documentation . August Home (Assa Abloy)
[7] (2024) . UL — Door Lock Testing Standards . Underwriters Laboratories
[8] (2024) . Tom's Guide — Smart Lock Reviews . Tom's Guide
[9] (2024) . Z-Wave Alliance — Protocol Documentation . Z-Wave Alliance
[10] (2024) . Matter Standard Documentation . Connectivity Standards Alliance
[11] (2024) . Apple Home — HomeKit Lock Support . Apple
[12] (2024) . Insurance Information Institute — Lock and Burglary Stats . Insurance Information Institute