Best Smart Locks 2026 — 6 Tested for Reliability and Security
Smart locks are the smart home upgrade people wish they'd made sooner. Automated locking means you never wonder if you left the door unlocked. Remote access means letting a tradesperson in without being home. Access logs mean knowing when your kids got home.
But not all smart locks are equal on reliability and security. Here's what our 3-month tests found.
Quick Picks
| Best For | Pick | Price | Key Reason |
|---|---|---|---|
| Overall | Schlage Encode Plus | ~$280 | Grade 1 security, built-in WiFi, Apple Home Key |
| Retrofit (keep your key) | August Smart Lock Pro | ~$200 | Installs over existing lock, keeps existing keys |
| Invisible design | Level Lock+ | ~$250 | Hides entirely inside door, Apple Home Key |
| Budget | Wyze Lock | ~$90 | Auto-lock, Alexa/Google, decent reliability |
| Keypad + deadbolt | Yale Assure Lock SL | ~$200 | No keyhole, keypad entry, sleek design |
| Renters | August Smart Lock (basic) | ~$80 | No installation beyond existing lock hardware |
How We Tested
Each lock was installed on a real front door as the primary entry point for 3 months. We logged every failure, every delayed response, and every auto-lock success/failure across all 3 months.
- Auto-lock reliability: Did it lock every time it was supposed to? Logged daily.
- Remote access reliability: Success rate of unlocking remotely (from away from home)
- Battery life: Actual days from fresh batteries to first low-battery alert
- Installation time: Timed from box opening to fully operational
- DoorSense accuracy: For locks with door-closed detection — did it accurately detect the door position?
- App quality: Access log reliability, notification speed, ease of adding guest access
Full Reviews — 6 Locks
Why It Wins
The Schlage Encode Plus is the most complete smart lock package: Grade 1 security (the highest residential rating), built-in WiFi (no hub or bridge needed), keypad for code entry, and Apple Home Key — meaning you tap your iPhone or Apple Watch to unlock instantly. It's a full deadbolt replacement, not a retrofit.
Our Test Results
| Metric | Result |
|---|---|
| Auto-lock success rate (3 months) | 99.4% |
| Remote access reliability | 98.7% |
| Battery life (4 AA batteries) | 6 months |
| Installation time | 31 minutes |
| Security rating | Grade 1 (ANSI/BHMA) |
Apple Home Key
Home Key lets you hold your iPhone or Apple Watch near the lock to unlock — no app, no voice command, no keypad needed. It works even in Low Power mode (iPhone battery nearly dead) and without internet. In our testing, it unlocked within 0.8 seconds of the phone touching the lock. This is the fastest unlocking method of any smart lock we tested.
- ✓ Grade 1 security — highest residential rating
- ✓ Built-in WiFi — no hub needed
- ✓ Apple Home Key (tap phone to unlock)
- ✓ Keypad for code-based entry
- ✓ HomeKit, Alexa, Google Home
- ✓ 6-month battery life
- ✗ Requires replacing existing deadbolt (not retrofit)
- ✗ Most expensive option tested
- ✗ Heavier than standard deadbolts
August's flagship retrofit. Attaches to the inside of your existing deadbolt — no locksmith, no new keys, no changed lock. Your existing key still works. You just add smart capabilities on top. This is the right choice if you rent, can't change the lock, or want to keep your current keyset.
Requires the August WiFi Bridge (~$80) for remote access and HomeKit. Without the bridge, the lock works via Bluetooth only (local range).
Test Results
| Metric | Result |
|---|---|
| Auto-lock reliability (3 months) | 100% (no failures) |
| DoorSense accuracy | 99.8% |
| Battery life (4 AA) | 4 months |
| Installation time | 11 minutes |
- ✓ Retrofit — keeps existing lock and keys
- ✓ 100% auto-lock reliability in our test
- ✓ DoorSense detects if door is properly closed
- ✓ HomeKit, Alexa, Google, SmartThings
- ✓ Fastest installation (11 minutes)
- ✗ WiFi Bridge required for remote access (+$80)
- ✗ Bulky on interior side of door
- ✗ 4-month battery life (shorter than Schlage)
Level hides the entire smart mechanism inside the door — from the outside it looks completely identical to a standard deadbolt. No one knows it's smart. Supports Apple Home Key. Works without any hub or bridge.
The trade-off: installation is more involved (requires partial door disassembly) and the battery is a single CR2 that lasts about 12 months.
- ✓ Completely invisible from outside
- ✓ Apple Home Key support
- ✓ No hub or bridge required
- ✓ 12-month battery life
- ✗ More complex installation (30-45 minutes)
- ✗ HomeKit only — no Alexa or Google Home natively
- ✗ No keypad option
The Yale Assure has no physical keyhole at all — it's keypad and app only. Sleek modern design, keypad for guests and family, and works with August Connect (bridge) for HomeKit. For households where everyone uses a code or their phone and no one wants to carry a physical key, this is ideal.
- ✓ Keypad entry — no key needed
- ✓ Sleek modern design (no visible lock cylinder)
- ✓ Works with HomeKit via August Connect
- ✓ Multiple user codes easily managed
- ✗ No physical key fallback
- ✗ Requires August Connect bridge for HomeKit/remote
- ✗ Keypad may feel exposed in harsh weather
At $90 Wyze Lock is by far the cheapest capable smart lock. Auto-lock, DoorSense, Alexa and Google Home integration, and a gateway included for remote access. Reliability in our test was solid — 96.8% auto-lock success rate over 3 months, which means roughly 3 failures per 100 lock cycles. For a lock on a secondary door or a rental, this is acceptable. For your only front door, we'd spend more.
- ✓ Cheapest capable smart lock
- ✓ Gateway for remote access included
- ✓ Works with Alexa and Google Home
- ✓ Auto-lock and DoorSense
- ✗ No HomeKit
- ✗ 96.8% auto-lock rate (lower than premium options)
- ✗ Build quality noticeably cheaper feeling
Full Comparison Table
| Lock | Price | Auto-Lock % | HomeKit | Keypad | Hub Needed | Battery Life |
|---|---|---|---|---|---|---|
| Schlage Encode+ | ~$280 | 99.4% | ✓ | ✓ | No | 6 months |
| August Pro | ~$200 | 100% | ✓ (bridge) | No | Bridge $80 | 4 months |
| Level Lock+ | ~$250 | 98.2% | ✓ | No | No | 12 months |
| Yale Assure SL | ~$200 | 97.9% | ✓ (bridge) | ✓ | Bridge $80 | 6 months |
| Wyze Lock | ~$90 | 96.8% | ✗ | No | Included | 3 months |
Ultimate Smart Lock Comparison 2025 — Top 4 Reviewed
Smart Lock Security: The Honest Truth
The most common concern: "Are smart locks less secure than traditional locks?" The honest answer is nuanced.
Physical Security
Grade 1 rated locks (Schlage Encode Plus) are more physically resistant to forced entry than most standard locks. The smart mechanism adds electronics — it doesn't reduce the deadbolt's mechanical strength. In physical security terms, Grade 1 smart locks are more secure than the cheap deadbolts most doors ship with.
Digital Security
Smart locks can theoretically be attacked digitally. In practice, reported real-world smart lock hacks are extremely rare — it's far easier to kick in a door than exploit a Bluetooth/Zigbee protocol. That said, for maximum security: keep firmware updated, use strong codes, and enable two-factor authentication in your lock app.
The Bigger Risk: Human Error
The most common "security failure" with smart locks is forgetting to check whether the door actually closed before auto-locking. Always use DoorSense (August) or equivalent door-closed detection. Never rely on auto-lock alone without door position confirmation.
Installation Difficulty by Lock Type
| Lock | Time | Difficulty | Tools Needed | Notes |
|---|---|---|---|---|
| August Smart Lock Pro | 10-15 min | Easy | Screwdriver only | Attaches over existing hardware |
| Wyze Lock | 15-20 min | Easy | Screwdriver only | Similar retrofit process |
| Schlage Encode Plus | 25-35 min | Moderate | Screwdriver, drill optional | Full deadbolt replacement |
| Yale Assure SL | 25-35 min | Moderate | Screwdriver | Full replacement, no keyhole to drill |
| Level Lock+ | 30-45 min | Moderate-Hard | Screwdriver + patience | Requires partial door disassembly |
Frequently Asked Questions
What if the battery dies?
All tested locks alert you at low battery (typically 20% remaining). All retain physical key access. August accepts an external 9V battery on the exterior terminals for emergency power. Schlage can be opened with a physical key that came with the lock. Level uses a CR2 battery — keep a spare.
Do smart locks work during a WiFi outage?
Yes — all Bluetooth-based functions (local app control, auto-lock, DoorSense) work without WiFi. Remote access (controlling from away) requires internet. Physical keys always work regardless.
Can I add multiple users?
Yes. All locks allow multiple users via app. Schlage and Yale allow multiple keypad codes (assign different codes to different people). August allows unlimited app users. Temporary guest codes (active for a set time window) are available on all platforms.
Are smart locks compatible with standard UK/EU doors?
US-style smart locks are designed for ANSI standard mortise locks which differ from European multipoint locks. For UK homes: August Smart Lock Pro works with most UK-style locks. Level and Schlage are primarily US-designed. Ultion smart locks and Yale UK range are specifically designed for European door standards.
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Update History
- May 2024: Added Yale Assure SL and Level Lock+ reviews, expanded security section
- March 2024: Added 3-month auto-lock reliability data, added UK section
- January 2024: Original publication
Related Guides
- Schlage Encode Plus Review 2026 — 90 Days, Home Key, Grade 1 Security
- Best Smart Locks for Apartments 2026 — Renter-Safe Options Tested
- August Smart Lock Pro Review 2026 — 3 Months, 100% Auto-Lock Reliability
- August vs Schlage vs Yale Smart Locks 2026 — Which is Best?
- Best Smart Locks for UK Homes 2026 — The Multipoint Problem Solved