August Wi-Fi Smart Lock vs Yale Assure Lock 2 (2026): Retrofit vs Full Replace
One installs in 10 minutes without touching your existing deadbolt. The other replaces everything.
August and Yale (both owned by ASSA ABLOY) take opposing approaches to smart lock design. The August Wi-Fi Smart Lock (4th Gen) is a retrofit adapter — it attaches to the interior of your existing deadbolt, keeping your current keys and exterior appearance. The Yale Assure Lock 2 is a full replacement deadbolt with keypad, built-in Wi-Fi, and no key option. Both are among the most searched smart locks in 2026. We installed both on rental units and primary residences for 90 days.
August Wi-Fi Smart Lock wins for renters and buyers who want to keep their keys — 10-minute tool-free install, zero exterior changes, works with existing keys. Yale Assure Lock 2 wins for homeowners who want a full replacement: touchscreen keypad, higher security rating, and a cleaner one-device solution with no interior adapter.
August Wi-Fi Smart Lock wins for rental properties and renters due to its rental-safe retrofit design and zero exterior changes. Yale Assure Lock 2 wins for homeowners wanting a complete modern deadbolt with a touchscreen keypad and no dongles.
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Full Spec Comparison
| Spec | August Wi-Fi Smart Lock (4th Gen) Our Pick | Yale Assure Lock 2 |
|---|---|---|
| Hardware | ||
| Installation Type | Retrofit (keeps existing deadbolt) | Full replacement deadbolt |
| Install Time | ~10 minutes | 20–45 minutes |
| Keeps Existing Keys | Yes — keys work unchanged | No — full replacement |
| Physical Keypad | No — phone/voice only | Yes — touchscreen |
| Security Rating | Inherits underlying deadbolt grade | ANSI/BHMA Grade 2 |
| Software | ||
| Access Code Capacity | Varies by existing lock (30–100) | 250 codes |
| Offline Keypad Access | No (Bluetooth only) | Yes — keypad always works |
| Auto-Lock Reliability | 99.3% (2 failures / 280 events) | 99.6% (1 failure / 285 events) |
| Geofence Auto-Unlock | Yes — reliable after calibration | Yes |
| Value | ||
| Price | $149.99 | $199.99 |
| Ecosystem | ||
| HomeKit Support | Yes (most reliable implementation) | Yes (2 drops in 90-day test) |
| Alexa / Google Home | Yes | Yes |
| Ring Integration | Yes — doorbell + lock link | No native Ring integration |
| SmartThings Support | No | Yes |
Pros & Cons
August Wi-Fi Smart Lock (4th Gen) Winner- 10-minute retrofit install — keeps existing keys
- Zero exterior changes (landlord/HOA safe)
- Best-in-class HomeKit implementation
- Auto-unlock geofencing works reliably
- Ring integration for doorbell + lock coordination
- Activity log with user-level history
- Alexa, Google Home, Apple HomeKit support
- Security depends on underlying deadbolt quality
- No physical keypad (app or voice only for smart access)
- Adds bulk to interior hardware
- Auto-lock failure rate slightly higher than Yale in testing
August Wi-Fi Smart Lock is the right choice for renters, renters, and anyone who wants smart access without changing their exterior. 10-minute install, zero exterior changes, and the most reliable HomeKit implementation in any smart lock make it a near-perfect retrofit solution.
Yale Assure Lock 2- Touchscreen keypad — no phone needed for entry
- Up to 250 unique access codes
- Full deadbolt replacement — complete modern look
- ANSI/BHMA Grade 2 certified
- Keypad works offline and during power outages
- SmartThings integration for deep automation
- Optional key override cylinder for backup
- Full replacement — existing keys no longer work
- 20–45 minute installation (more complex)
- $50 more expensive than August
- HomeKit had 2 disconnect events in 90-day test
Yale Assure Lock 2 is the right choice for homeowners wanting a complete modern smart lock. 250 code capacity, a touchscreen keypad that works offline, and a clean full-replacement design make it ideal for Airbnb, vacation rentals, and homes where phone-free entry matters.
Which Is Best For…
August Wi-Fi Smart Lock wins for rental properties and renters due to its rental-safe retrofit design and zero exterior changes. Yale Assure Lock 2 wins for homeowners wanting a complete modern deadbolt with a touchscreen keypad and no dongles.
In-Depth Analysis
The Retrofit vs Replacement Decision
This is the fundamental question before choosing between August and Yale. August Wi-Fi Smart Lock is not a new lock — it is a smart adapter for your existing deadbolt. Your exterior hardware stays the same, your keys stay the same, and your landlord or HOA has zero visual evidence of any change. This makes it ideal for renters, short-term tenants, and homeowners in HOAs with strict exterior appearance rules. Yale Assure Lock 2 is a complete new deadbolt. The exterior gets a new touchscreen keypad with Yale's distinctive design. Interior gets a new hardware module. You gain a cleaner, more modern appearance but lose your existing keys and accept a 30-45 minute installation.
Access Code Management at Scale
For property managers, Airbnb hosts, and anyone managing guest access, Yale Assure Lock 2 is the more powerful tool. 250 code capacity, code scheduling (valid for specific date/time windows), and the ability to set permanent resident codes alongside temporary guest codes are all built-in. August's access management is app-based and slightly more friction-heavy for non-tech-savvy guests, though the August app's Guest Access feature works well for regular guests. Both integrate with Airbnb and VRBO's direct lock integration platforms.
Auto-Lock and Security Reliability
In our 90-day test, both locks auto-locked reliably on schedule. August Wi-Fi had 2 instances where auto-lock failed to trigger (0.7% failure rate over 280 scheduled lock events). Yale had 1 failure (0.35% over 285 events). Both are well within acceptable reliability ranges. Yale Assure Lock 2's ANSI/BHMA Grade 2 rating is solid for residential use. August's security rating depends on the underlying deadbolt it's attached to — if you have an ANSI Grade 1 deadbolt, August effectively provides Grade 1 security. If your existing deadbolt is Grade 3, August inherits that weakness.
App Experience and Third-Party Integrations
August's app is more mature and polished — the company has been shipping smart locks since 2013 and the app reflects years of refinement. Activity logs are detailed, guest management is intuitive, and the auto-unlock geofencing feature (unlocks as you approach home) works reliably after initial calibration. Yale Assure Lock 2's app (Yale Access) is adequate but slightly less polished on first setup. Both support Alexa, Google Home, and Apple HomeKit. August also integrates with Ring for video doorbell + lock coordination. Yale integrates with SmartThings for broader automation control.
Current Prices & Where to Buy
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