Bluetooth or Wi-Fi smart lock?
Updated
The radio inside a smart lock decides battery life, remote control and how guests get in. Compare Bluetooth, built-in Wi-Fi and Thread or Matter locks before you buy a smart deadbolt.
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Which one should you pick?
Bluetooth gives phone unlock, a keypad and codes with the longest battery life, and no hub or router dependency.
Built-in Wi-Fi connects the lock to the internet and your phone with no extra hub.
Wi-Fi lets you create and delete codes remotely, which is the main reason hosts buy these locks.
A Matter lock over Thread offers local control with low power; a Bluetooth lock can also connect through a Wi-Fi bridge accessory.
Bluetooth lock vs Wi-Fi lock
| What changes | Bluetooth lock | Wi-Fi lock |
|---|---|---|
| How it connects | Bluetooth LE to your phone, within range of the door | Your home Wi-Fi router, so the lock is reachable over the internet |
| Remote lock and unlock | Only through an add-on bridge | Yes, built in |
| Battery life | Longest; Bluetooth LE is designed for very low power operation | Shorter; staying on Wi-Fi uses more energy, so expect more battery changes |
| Needs a hub or bridge | Only for remote access | No |
| Works if the internet is down | Yes: keypad, key and phone nearby still work | Keypad and key work; remote control and notifications stop |
| Guest codes | Create codes near the lock, or through the bridge | Create, schedule and delete from anywhere |
| Voice assistants and Apple Home, Google Home, Alexa | Often through a bridge or Matter over Thread | Often directly, with the lock’s own skill |
| Typical price | $90–$250 | $120–$300 |
| Security basics | Short-range radio; keep firmware updated | Internet-facing; use two-factor sign-in and a strong Wi-Fi password |
The three connection types
Smart locks connect in three ways. Bluetooth talks to your phone when you are near the door and is designed for very low power. Wi-Fi connects the lock to the internet through your router, so you can act from anywhere. Thread, usually with Matter, is a low-power mesh that connects through a border router such as a smart speaker or display and keeps working without the internet.
Matter is a common language that lets one lock work with Apple Home, Google Home, Alexa and others at the same time. Thread is the low-power network it often rides on. Check your lock’s box for “Matter” and “Thread”, and check that you own a Thread border router.
Why battery life decides this
A lock that sits on Wi-Fi all day spends more energy than one that sleeps until your phone arrives. A Bluetooth lock may run for many months on four AA batteries; Wi-Fi locks often need changing sooner. Cold weather makes it worse: most batteries deliver only about half their capacity near -4°F, according to Battery University. Choose a lock with a low-battery warning, a 9-volt jump terminal on the outside, and a key or keypad that still works when the app does not.
What to check before buying
- Confirm the lock fits your door with the door fit guide.
- Decide whether you need remote access. If you do not, Bluetooth is simpler and cheaper to run.
- Check your router signal at the door. A Wi-Fi lock with a weak signal will drop offline.
- Keep a physical key or keypad as backup, and make sure the door opens from inside without a key, as the residential building code requires for exit doors.
Keeping it secure
Use a unique password and two-factor sign-in for the lock account. Install firmware updates. The FTC recommends changing default credentials and keeping devices updated. Read are smart locks safe for the risks that actually matter.
Mistakes to avoid
- Buying a Wi-Fi lock for a door at the edge of your router’s range. Test the signal on your phone at the door first.
- Assuming Bluetooth means remote access. It does not, unless you add a bridge.
- Removing the physical key option. Keep a way in that does not depend on batteries, the app or the internet.
- Forgetting to change the default master or installer code on the keypad.
Shop by need
Keyless entry, long battery life
What to look for: Bluetooth LE, keypad plus key backup, 9-volt emergency terminal, low-battery alerts
Typical price: $90–$250
See options on AmazonRemote access and guest codes
What to look for: built-in Wi-Fi, scheduled guest codes, activity log, two-factor sign-in
Typical price: $120–$300
See options on AmazonSmart home with local control
What to look for: Matter over Thread, keypad, replaceable batteries, works with your border router
Typical price: $150–$300
See options on AmazonFrequently asked questions
Do I need Wi-Fi for a smart lock?
No. Bluetooth locks unlock from your phone near the door, from the keypad or with a key. Wi-Fi is only needed for remote control and notifications away from home.
Which smart lock connection has the longest battery life?
Bluetooth and Thread locks are designed for low power, so they usually last longer than locks that stay connected to Wi-Fi. Actual life depends on use and cold weather.
Can I add Wi-Fi to a Bluetooth lock later?
Many Bluetooth locks work with an optional Wi-Fi bridge that plugs into an outlet and adds remote access. Confirm that your lock supports one.
Are Wi-Fi smart locks less secure?
Not by default, but the lock account is reachable from the internet. Use a strong unique password, two-factor sign-in and keep the firmware updated.
Sources
- Bluetooth SIG — Bluetooth technology overview (Low Energy radio)
- Connectivity Standards Alliance — Matter
- Thread Group — What is Thread
- Battery University — BU-502: Discharging at high and low temperatures
- Montana Department of Labor & Industry — 2021 IRC means of egress (training slides, R311.2)
- Federal Trade Commission — Securing your internet-connected devices at home