August Wi-Fi Smart Lock (4th Gen) Review 2026: The Best Retrofit Lock?

August Wi-Fi Smart Lock Review.

Imagine coming home with groceries in both hands. Instead of fumbling for keys, your door unlocks automatically as you approach. Welcome to the future with the August Wi-Fi Smart Lock (4th Gen).

Most smart locks require you to replace your entire deadbolt, which is a nightmare for renters or anyone not handy with tools. August takes a different approach: it fits over your existing lock on the inside of your door.

In this review, we’ll explore why this compact device is the ultimate upgrade for any smart home beginner.

August Wi-Fi Smart Lock
#1 Renter Friendly Choice
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Why August is Different?

The genius of the August Wi-Fi Smart Lock lies in its "retrofit" design. From the outside, your door looks exactly the same, and your original keys still work. But from the inside, it’s a powerhouse of technology.

  • Auto-Unlock: Using your phone’s GPS and Bluetooth, the lock detects when you arrive home and unlocks the door automatically.
  • Built-In Wi-Fi: No need for an extra "Connect Bridge" or hub. It connects directly to your home Wi-Fi right out of the box.
  • Guest Access: Send temporary virtual keys to friends, dog walkers, or cleaners instantly from the app. No more hiding keys under the mat.
  • DoorSense™ Technology: A small sensor tells you if your door is securely closed and locked, so you never have to wonder.

Installation: 10 Minutes, No Drill

We aren't exaggerating. You only need a screwdriver. Since you are keeping the existing outside lock, you just replace the thumb-turn on the inside.

This makes it perfect for renters—when you move out, you simply put the old thumb-turn back on and take your smart lock with you.

Pros & Cons

✅ The Pros:
  • Keep your existing keys and design.
  • Incredibly easy installation.
  • Sleek, compact design (45% smaller than Gen 3).
  • Works seamlessly with Apple HomeKit, Alexa, and Google Assistant.
❌ The Cons:

Final Verdict

If you want to make your door smart without changing the look of your home or dealing with complicated wiring, the August Wi-Fi Smart Lock is the undisputed king.

It’s elegant, intelligent, and solves the "did I lock the door?" anxiety once and for all.

Get the Best Deal

Ready to ditch your keys? Click below to check stock and pricing on Amazon.

August Wi-Fi Smart Lock
#1 Renter Friendly Choice
Check Latest Price
🔒 Upgrade Your Deadbolt Instantly

Disclaimer: As an Amazon Associate, I earn from qualifying purchases.

Pair this lock with the Blink Video Doorbell to see who is at the door before you unlock it remotely.