A lock that answers to your voice sounds like the end of fumbling for keys. In practice, the interesting part is not whether a lock appears in the Alexa or Google app, but what each assistant will actually let it do. Smart locks compatible with Alexa and Google Home split into two groups: those that can be locked and checked by voice, and those that can also be unlocked, with a code and a caveat. This guide covers the lines that work with both ecosystems, where each one asks for a hub, and how to choose without losing the feature you wanted. If you want the wider picture first, our buying guide for front door locks covers the hardware side.
What Alexa and Google Actually Allow a Lock to Do
Both assistants can lock a door. Both can read its status. Neither gives you a frictionless “unlock the front door” command, and that is by design rather than an accident of hardware.
Alexa will unlock a lock only when you have set a voice code in the Alexa app. You say the PIN out loud, and the door opens. It works, it is slower than a keypad, and anyone within earshot learns your code.
Google Assistant is more restrictive. It reports lock state and can lock, but voice unlocking is not something you should count on for a front door across the lines below. If unlocking by voice matters to you, Alexa is the realistic path, and the PIN is the price.
Smart Locks Compatible With Alexa and Google Home: Side by Side
| Lock line | Connection | Alexa | Google Home | Hub needed for voice and remote | Voice unlock |
|---|---|---|---|---|---|
| August | Bluetooth, plus Wi-Fi bridge or built-in Wi-Fi | Yes | Yes | Bridge for older units, none for Wi-Fi models | Alexa with PIN |
| Schlage Encode | Built-in Wi-Fi | Yes | Yes | No | Alexa with PIN |
| Yale Assure and Approach | Wi-Fi, Z-Wave or Matter module | Yes | Yes | Depends on the module you fit | Alexa with PIN |
| Lockly | Wi-Fi or Zigbee | Yes | Yes | None for Wi-Fi, a hub for Zigbee | Alexa with PIN |
| Aqara | Zigbee or Thread | Yes | Yes | Yes, a hub or border router | Alexa with PIN |
The table hides the part that decides most purchases: a lock with a built-in Wi-Fi radio needs nothing else, while a Bluetooth or Zigbee lock needs a bridge before any assistant can see it. That extra box is cheap, but it is one more device to power and one more failure point.
August: The Retrofit Option
August builds locks that fit over the inside of an existing deadbolt. You keep your keys and your outside handle, which matters in a rented flat or in a door with a finish you do not want to spoil.
- Strengths. Installation takes minutes and needs one screwdriver. The app is mature, guest access is well handled, and the line works with both assistants once a bridge or a Wi-Fi model is in place.
- Trade-offs. The retrofit design adds bulk inside the door, and the outdoor side looks unchanged, so guests still need a code or the app. Battery life suffers in cold weather.
- Best for: renters and anyone unwilling to drill a new door.
Schlage Encode: The Simple Wi-Fi Choice
Schlage puts the Wi-Fi radio inside the lock, so nothing else is required: no bridge, no hub, no second app for connectivity.
- Strengths. Straightforward setup, a keypad that works with cold or wet hands, and both assistants see it immediately. The range is decent for a front door close to the router.
- Trade-offs. Built-in Wi-Fi costs battery, so expect more frequent changes than with a Bluetooth lock. The unit is heavier and the keypad is the only interface for visitors.
- Best for: the household that wants one device and no accessories.
Yale: The Modular One
Yale sells the same lock body with different modules, so the same hardware can be Bluetooth, Z-Wave or Matter depending on the cartridge you fit. That flexibility is rare and worth understanding before you buy.
- Strengths. You can change the radio later without replacing the lock, and the range of finishes is broader than most. Both assistants support it through the matching module.
- Trade-offs. The module system confuses buyers, and the wrong module leaves you without remote access. Support quality varies by region.
- Best for: anyone who wants to start simple and add Matter later.
Lockly: The One With the Screen
Lockly puts a keypad and, on some units, a fingerprint reader at the door, with a design that leans towards visible technology rather than a discreet handle.
- Strengths. Fingerprint entry is genuinely quick when your hands are full, and the Wi-Fi units need no bridge. Voice control covers lock and status, plus routines.
- Trade-offs. More electronics at the door means more to fail, and the fingerprint sensor needs a clean, dry finger. The visual footprint is larger than a plain deadbolt.
- Best for: families where several people come and go with shopping bags.
Aqara: Cheapest Path Into Both Ecosystems
Aqara locks are the budget route, and they are honest about needing a hub. With a Zigbee hub you get remote access, status and both assistants. Newer Matter units skip the vendor hub but still need a Thread border router.
- Strengths. Low cost for the features, tight integration with sensors and automations, and a clear upgrade to Matter.
- Trade-offs. The ecosystem expects other Aqara devices to make sense, and the hub is not optional. Documentation is thinner than the mainstream brands.
- Best for: a house already running Aqara sensors.
The Voice Unlock Problem, Stated Plainly
Voice unlocking is the feature people ask for and the feature they stop using. Three reasons show up again and again.
- The PIN is spoken aloud. Anyone at the door, on the phone, or listening through a window learns it. Change it after guests.
- The wake word is not authentication. A speaker near a window can hear a voice through the glass. A code is the only barrier Alexa offers.
- Google will not do it. For front doors, the assistant locks and reports. Unlocking stays in the app, the keypad or the key.
The practical compromise is to use voice for locking and status, and the keypad for entry. That keeps the convenience without turning your door into a voice-authenticated device.
Matter and Thread: What Changes
Matter moves the lock’s control into one standard, so the same lock can appear in Alexa, Google and Apple Home without a vendor bridge. The catch is the radio underneath. Matter over Thread needs a border router in range, and Matter over Wi-Fi keeps the battery cost.
Our explainer on what Matter is and why it matters covers the plumbing, and the Connectivity Standards Alliance publishes the device types. For a lock, the useful promise is longevity: buy a Matter lock now and the assistant you switch to in three years should still control it.
Security Questions Worth Asking Before You Buy
A lock is the one smart device where a bad decision is physical. Three checks separate a sensible purchase from a risk.
- Local fallback. The lock must work with a key or a keypad when the Wi-Fi is down. Cloud-only entry is a single point of failure.
- Encryption and updates. Look for a vendor that ships firmware updates and documents them. Our guide to how secure smart locks are from hacking goes deeper.
- Access logs. Every guest code should be revocable and every entry logged. If the app cannot tell you who came in and when, the smart part is decoration.
Decision Checklist: Which One Fits
- Renting, or a door you cannot modify. August retrofit, with the bridge if you want remote access.
- No interest in hubs. Schlage Encode, with the battery cost accepted.
- Planning for Matter without rebuying. Yale with the module you need today.
- Several people, hands full. Lockly with the fingerprint reader.
- Already running Aqara sensors. Aqara lock plus the hub you own.
- Voice unlock as a hard requirement. Any line above, with Alexa and a PIN, changed after every guest.
FAQ
Can Alexa unlock my front door?
Yes, if the lock supports it and you have set a voice code in the Alexa app. You say the PIN each time, and the assistant unlocks the door. Without a code, Alexa will only lock and report status.
Can Google Assistant unlock a smart lock?
Not reliably, and you should not buy a lock expecting it. Google lets the assistant lock and check the door, while unlocking stays in the manufacturer’s app or on the keypad.
Do I need a hub for a lock to work with Alexa?
Only if the lock has no Wi-Fi radio of its own. Bluetooth and Zigbee locks need a bridge or hub before any assistant can see them, and without it you lose remote access as well.
Do smart locks work with both assistants at the same time?
Yes. A single lock can be linked to Alexa and Google Home at once, and both will report status. The routines you build in each app stay independent of the other.
What happens to a smart lock when the internet goes down?
The keypad, the key and any local automation keep working. Remote access, voice control and guest codes stored in the cloud stop until the connection returns, which is why a key fallback matters.
Is a voice-controlled lock safe for a front door?
It is as safe as the code you use and who hears it. A spoken PIN is weaker than a keypad code typed out of sight, and no assistant verifies that the voice belongs to you.
Final Thoughts
The list of smart locks compatible with Alexa and Google Home is long, but the real decision is smaller. Choose whether you want a hub, then choose how entry should work, then check what each assistant will actually do with the lock. Voice is excellent for locking and checking, mediocre for unlocking, and no substitute for a keypad. Get that order right and the door works every time. If you are still deciding which assistant deserves the house, our Alexa, Google and Apple comparison covers where each one is stronger.
