Why this deal is -recommended:

• TheLevel Lock+ is on sale now for$309,with a$50 discount when youbundle with a Black Keypad . You can also get between$30-$50 off on different bundles, including aLevel Lock Plus with 6 Keyfobs
• The Level Lock+ supports Apple Home Key, NFC, and physical keys and can be locked with a touch.
  
• The Level Lock+ doesn't come with a keypad; one has to be purchased separately. The Apple Home app can be slow to connect to devices.

I've had the fortune of testing several smart lock brands and models and, through all the ups and downs of that process, have finally found the one for me. TheLevel Lock+ is one of only two smart locks in the US market that supports Apple Home Key. This makes the Level Lock+ a seamless fit for a HomeKit smart home like mine, and the single most convenient smart lock I've tested to date.

Also: The Ring video doorbell is only$60 during Amazon's Presidents' Day sale

Smarts aside, much of the beauty in the Level Lock+ lies beneath the surface. This is one of the most compact smart locks available, with no built-in keypad or visible indication of it being a smart device; all you see is a deadbolt from the outside and a thumb-turn from inside your home.

What lies within the Level Lock+?

The Level Lock+ is an impressive piece of engineering, given its small size. Many consumer-grade, smart home locks are bulky and imposing, while the Level Lock condenses its entire apparatus, including its CR2 battery, into the cam slot mechanism of your door's borehole.

Also: 10 tiny 'everyday carry' tools and gadgets I keep on my keychain

Still, installing locks is not always a one-size-fits-all experience. The Level Lock+ wasn't the easiest smart lock I've ever installed. I had a few issues making sure the deadbolt assembly was aligned correctly and with the Level Lock's thick strike plate after removing my existing lock, and I had to chisel out a few extra millimeters in my door and door frame to get the right fit. After installing the new smart lock and adding the included battery, setting up the Level Home app was a breeze. 

The Level Lock+ uses Bluetooth and Wi-Fi to connect to your phone and comes in three finishes: Satin Nickel, Matte Black, and Polished Brass. It also includes two physical keys and key cards, just in case your phone dies. The latter must be set up in the Level Home app and use NFC technology so anyone using a key card can hold it up to the smart lock and wait for it to unlock.

What is Apple Home Key?

Home Key allows iPhone users to unlock their door using near-field communication (NFC) technology, so simply holding your iPhone or Apple Watch up to your Level Lock+ will unlock it; no passcode, physical key, or touching is required. This is much like using Apple Pay, as your virtual house key is saved in your Wallet, like your debit and credit cards, government IDs in some states, loyalty cards, and, if Apple has its way, eventually your car key.  

After adding your Home Key-supported smart lock to HomeKit, you can choose from two options: Express mode to unlock the door without unlocking your device or Require Face ID or Passcode, which have you to unlock your iPhone to undo your lock after holding it close to it. 

Apple Home Key works with iPhone XS or newer (iOS 15 or later) and the Apple Watch Series 4 or newer (WatchOS 8 or later).

Also: Blink's battery-powered Floodlight Camera is a big score at only$85

Express mode has been my favorite of the unlock features Apple Home Key supports. I don't always like having my door automatically unlock when I arrive home because I don't always go through my front door when I get home -- most of the time, I come in through the garage. 

Having the option of quickly unlocking my front door using my Apple Watch, without entering a code or using a key, has been superb, especially when my hands are full of grocery bags or kids' backpacks.

It's a big deal finding a great smart lock that works natively with Apple HomeKit, which is the tech company's notoriously exclusive home automation system. HomeKit behaves like a walled garden in the smart home world, as Apple is restrictive with which products can meet its privacy and security standards. Protecting customers' data is laudable, but this results in few smart devices on the market that work with HomeKit.

Also: The all-new Echo Show 8 is down to$90 during Amazon's President's Day sale

Don't get me wrong, I've always used myYale Assure locks with HomeKit and loved them, but I just hadn't leaped to get a smart lock with Home Key support. 

There are several other smart locks that currently support Home Key: TheSchlage Encode Plus , Yale Assure Lock 2 Plus , and Aqara U100

Level app or Apple Home?

After installing the Level Lock+, you can use it either with the Level app or your Apple Home app. I've enjoyed how intuitive the Level app is to navigate and found the Home app to be slower to refresh and discover devices (in general, not just with this smart lock), so I mostly use the former.

Also: Ring's first 'Pro' battery doorbell has a radar-powered 3D scanner that's next level

Like most smart locks, you can set up and customize different auto lock and auto unlock features, Apple Home automations, and different settings for manually locking and unlocking the Level Lock. Because there is no keypad to unlock the door, the Level Lock features touch-to-unlock or lock settings. Once you customize and enable these in the Level app, you can touch the front of the door lock to either lock it or unlock it in just a few seconds.

The touch-to-unlock and lock feature only works within a set timeframe of engaging the lock to prevent unlawful entry or break-ins. This means you set a timeframe of a few minutes in which your Level Lock+ will lock or unlock when you touch it. 

There's also the option of buying a Level keypad, which is sold separately, to add to your Level Lock.

's buying advice

The Level Lock+ is a remarkable piece of technology for Apple users. I've found it unwaveringly reliable when used with Apple Home Key, the Level app, or on its own. The only drawbacks I've encountered are my strike plate and fit woes and, in everyday use, trying to lock and unlock it from within the Apple Home app. Having been a consistent HomeKit user for over a year, I can assure you this is the case with many devices in the Home app, so I can't fault Level for it. 

The two largest advantages the Level Lock+ has over other smart locks are the Home Key support in the Wallet app and the fact that it's compact and discreet enough to pass for a standard deadbolt -- which is a plus for anyone looking to maintain a certain aesthetic or a renter. 

See also

How I made my home smart on a budget (and how you can, too)

How to customize Alexa's responses to Amazon routines

Your HomePod Mini has a hidden temperature and humidity sensor. How to enable it

How to save on utility bills with 4 smart home devices

• How I made my home smart on a budget (and how you can, too)
• How to customize Alexa's responses to Amazon routines
• Your HomePod Mini has a hidden temperature and humidity sensor. How to enable it
• How to save on utility bills with 4 smart home devices