Lockly Duo Smart Lock in the test: steep price for comfort


Duo ™ Smart Lock

RRP $ 450.00

“The Lockly Duo replaces both your door lock and your deadbolt, but the price is just too high.”


  • Replaces both locks on your door

  • Open and lock both locks with one handle

  • Precise fingerprint sensor

  • Random number pad for security


  • Some design problems

  • App is just ok

One of the biggest problems I’ve encountered with smart home door locks is that they tend to replace the deadbolt or latch. The Lockly Duo replaces both. I have mixed feelings about this lock setup, but I think those mixed feelings come from dealing with the unknown rather than from Lockly’s mistakes. I know it was nice that both locks are smart and accessible by fingerprint, key or code for a change.

Lockly behaves in an unusual way. Both the door lock and the deadbolt are controlled by a single door handle. A push-down unlocks both locks, a pull-up locks both locks. It definitely takes getting used to, and despite its strangeness, I like this mechanism. It’s just easier to have a single handle that releases both locks, even if it’s unusual.

Installation and setup

Setting up the lock required a bit of work and some complex mechanisms. The lock is designed to cover a latch and door handle that are either 4 “or 5½” apart. My door is 5 ½ inches so it worked. Or at least if my latch handle had been drilled to the right size. To attach the cover plate to my door, I had to sand about a quarter of the door. It’s not Lockly’s fault. The cover plate itself is also significantly larger on the outside than the door latch, so it doesn’t look that great.

With the Lockly Duo, there is a clear gap between the locking mechanism and the door handle.

On the inside there is an additional mechanism that mounts between the door lock and the door called the connecting plate. This plate connects the bolt and the door lock with the single handle. It’s not a bad device, but it adds a complexity to the lock that I wasn’t expecting. In addition, the connecting plate is not flush with the door handle. It’s not particularly noticeable, but if I hold a flashlight to the end of the lock, I can see the light on the other side.

There is no shortage of smart locks on the market, but none of them control both the trap and the bolt.

The Lockly Duo also has an integrated wired door sensor for the Lockly security system. I didn’t install this as I already have a Vivint security system installed. But the fact that it’s wired to the door handle and I couldn’t remove it was a bit annoying.


Once installed, use the Lockly app to set up PINs and fingerprints for users. The fingerprint sensor is located on the side of the door lock and a screen above the door lock shows the buttons for the codes. Most of the time the screen is turned off. A single tap usually turns it on, although occasionally I had to tap it a second time to wake it up. The numbers displayed are randomized into four buttons with three digits per button. This ensures that repeated tapping of the same point for the same codes does not develop a wear pattern. After entering your code you will need to press some sort of “Enter” key below the keys, but there is no indication that the key is an Enter key. At first glance it looks like a fingerprint, so I initially confused it with the statement: “Sure, you can enter a code, but don’t forget the fingerprint sensor.” The button needs a better design or it just has to say “Enter” .

The Lockly Duo uses a fingerprint sensor or a code to allow access.

The fingerprint sensor works very well, although I’m not convinced the placement is the best. When you have a door handle on the left side of the door, your natural instinct is to reach for the door with your left hand. But when you do, your fingers are pointing away from the sensor. The fingerprint sensor is a bit too cumbersome to use a thumbprint, so you end up having to reach across your body to scan a finger on your right hand and then use your left hand to actually open the door.


The app also lets you lock and unlock the door, and is supposed to be able to pair it with the Google Assistant, but I couldn’t get this to work. The app itself is relatively simple and easy to understand. You use it to set fingerprints and PIN codes. Setting up fingerprints works similarly to setting up a fingerprint on your phone. You press your finger on the sensor several times until the app tells you that you’re done.

The app also allows you to activate “Welcome Mode” and this is one of my other main problems with the lock. Welcome mode means your door will stay unlocked on a schedule. That’s nice, but in the summer when people come and go all day, it would be nice if there was a button or button that you can use to unlock the door. The only way to toggle the welcome mode on or off is currently through the app. That’s not ideal.

Our opinion

Overall, this is a decent device with some oddities (and a price tag) to get used to. It’s a great concept to be sure of. Using a door handle is much easier than locking and unlocking two locks individually. You still get the security of a dead bolt along with the convenience of a single door handle. There are some quirks here, like the inability to leave the door unlocked without using your phone and the oversized mounting plates for the lock. The handle sticks out quite a bit too which actually bothered my screen door. Many of these are minor issues that can certainly be fixed in a 2.0 product.

But at $ 450 you really don’t want any compromises from a door lock. That’s way more than double the average smart door lock on the market. That’s a high price to pay for a little comfort. I usually leave my door lock unlocked because only my bolt was smart up to the Lockly. Having a door lock that works for both the deadbolt and the deadbolt is great, but I’m not convinced that $ 450 is great.

Is there a better alternative?

The Lockly’s fingerprint reader and code field both work great. There’s no shortage of smart locks on the market – check out our list of the most popular smart locks – but none of them control both the trap and the bolt. Is that the best in the world? It is certainly convenient. There were times when I locked myself out of the house when I forgot to unlock the doorknob. With this lock that’s never a problem.

For roughly the same price, the ultimate Smart Lock is available in the Lockly Vision. It is the Swiss Army Knife among intelligent locks because it offers all modern conveniences, but also serves as a video doorbell. If you prefer something a little more discreet, the Level Touch looks like an ordinary deadbolt lock on any door, and doesn’t have the distracting keypads and bulky bolts normally associated with smart locks. And finally there is the August Wi-Fi Smart Lock, which is characterized by its moderate price, easy installation and incredible security features.

How long it will take?

I have no reason to believe this door lock won’t hold. It is built from durable materials. The locks are backed by a five-year guarantee on mechanics and workmanship and a two-year electrical guarantee. The gap between the lock plate and the door handle makes me pause, but it’s inside so it should be hit by the rain. In general, I have no complaints about the durability.

Should you buy it?

No. There are certain reasons why you wouldn’t want this lock from a functional standpoint. If your door does not have an awning or other weather protection, you will find that the fingerprint sensor and the code board are very sensitive to rain and practically no longer work. If you don’t like the aesthetics of the door handles and prefer doorknobs, you should pass.

But the main concern I have is the pricing which is very high. Put simply, you can buy a smart door lock and bolt and still have money for a few battery packs before you hit that price threshold. Lockly needs to bring the price down before it is considered a solid buy.

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