Smart Lock Guides
Every buying guide, comparison review, and technical how-to from the DU Tech Team — physically tested, sponsor-free, updated for 2026.
Buying Guides — By Use Case
6The 7 Best Retrofit Smart Locks of 2026
Our definitive annual ranking, covering seven locks tested over 30+ days each. The go-to starting point for any buying decision.
Best Retrofit Smart Locks for Airbnb Hosts 2026
Auto-expiring guest codes, native Airbnb integration, and zero-damage installation. Everything a short-term rental host needs.
Best Smart Locks for Renters 2026: No Drilling, No Damage
Zero drilling, no permanent modification, complete removal at move-out. Top 5 renter-safe picks with a landlord compatibility guide.
Best Smart Locks for Apartments 2026: Intercom-Compatible Picks
Apartment-specific guide: door clearance, intercom integration, HOA rules, and concrete wall Wi-Fi tips. Top 4 picks for apartment renters.
Best Smart Locks for VRBO & Vacation Rental Hosts 2026
VRBO has no native smart lock integration. Here's how to fully automate guest codes across VRBO, Booking.com, and direct bookings using PMS software.
Top 5 Retrofit Smart Locks with Apple HomeKey (2026)
Tap your iPhone to unlock — no app needed. We cover every HomeKey-certified retrofit lock plus Power Reserve mode explained.
Head-to-Head Comparison Reviews
4August Wi-Fi vs Level Lock+ — Full 2026 Comparison
The two most popular retrofit locks go head-to-head across 8 scored categories. Which one is actually right for you?
Schlage Encode Plus vs August Wi-Fi 4th Gen (2026)
Both score 4.8★ for opposite reasons — ANSI Grade 1 security vs Auto-Unlock + Airbnb. Security-first homeowners vs smart feature seekers.
Aqara U400 vs Level Lock+: Matter 1.4 vs Apple HomeKey (2026)
Thread-native on both sides. Aqara opens every ecosystem simultaneously. Level perfects the single iPhone tap. 30-day test with an 8-category verdict.
Wyze Lock vs SwitchBot Lock Pro: Budget Battle 2026
Both under $110, both retrofit. Wyze maximises value and battery life. SwitchBot adds fingerprint biometrics at half the premium-tier price.
Technical Guides & How-Tos
2Matter 1.4 Smart Locks: Everything You Need to Know (2026)
LIT protocol, Enhanced Multi-Admin, Thread Border Routers — the complete technical breakdown written in plain English.
How to Install a Retrofit Smart Lock — Step-by-Step 2026
No drilling. No tools beyond a screwdriver. 15-minute install on any standard deadbolt, plus compatibility check and troubleshooting.
Not sure where to start?
Our flagship 2026 buying guide covers every use case in one place — ranked, scored, and tested by our team.
Need a direct lock comparison?
August vs Level, Schlage vs August, Aqara vs Level, Wyze vs SwitchBot — all 4 head-to-head reviews are above.