Best Smart Locks for 2026

A smart lock is the device that changes the most about daily life and the one most likely to be returned. The difference between those two outcomes is almost never the brand. It is whether the lock fits the door and whether it fits the way you actually come home.

So this guide starts with measurements and lease terms, not with a ranking. Get those right and almost any well-made lock from a major brand will serve you for years.

Step 1: Measure your door before you read anything else

Take these four measurements. They take ten minutes and they eliminate most wrong purchases.

1. Backset. The distance from the edge of the door to the center of the hole where the deadbolt sits. In the US this is usually either 2⅜ inches or 2¾ inches.
2. Cross bore. The diameter of the hole through the door face — commonly 2⅛ inches. A lock designed for a different bore will not sit flush.
3. Door thickness. Most US residential doors are 1⅜ inches or 1¾ inches. Thicker doors need a longer bolt or an extension kit.
4. Handing. Which way the door swings. Some locks are reversible; some are handed and must be ordered correctly.

Also look at the gap between the door and the frame. A lock with a smooth motorized bolt will struggle on a door that binds, and no amount of firmware will fix a sagging hinge.

Step 2: Decide whether you can replace the deadbolt

Replacement locks take over the whole deadbolt. They generally look better, feel more solid, and offer more entry methods — fingerprint readers, backlit keypads, Apple Home Key. Installation is a screwdriver job for most people, assuming your measurements match.

Retrofit locks mount over the interior thumb-turn and leave the existing deadbolt in place. Your keys still work. Your landlord's keys still work. You can unscrew it and take it to your next place. You give up some polish, and the exterior of your door stays exactly as it is.

If you rent, retrofit is the default answer unless your lease explicitly allows hardware changes. If you own the home and plan to stay, replace.

Step 3: Pick your entry methods deliberately

Every lock advertises a long list. In practice, households use two or three of them. Rank them by what you will genuinely do at 7am with your hands full.

• Auto-unlock. Opens as you arrive. Wonderful when tuned well, irritating when it fires from the sofa. Give it a week of testing before you rely on it, and check whether the app lets you restrict the geofence radius.
• Fingerprint. The fastest entry method when your hands are dry. Less reliable in cold weather or with wet hands, so always keep a second method enabled.
• Keypad code. The best method for anyone who is not you. Look for per-person codes with schedules so a cleaner's code can expire.
• Apple Home Key / phone tap. iPhone owners tend to love this because Wallet works even when the phone battery is nearly flat.
• Physical key. Non-negotiable. A lock without a key backup is a lock that can strand you.

Step 4: Work out the power and network story

Wi-Fi locks connect straight to your router with no extra hardware, and pay for it with battery life. Zigbee, Thread and Bluetooth locks use far less power but usually need a hub, a border router, or a phone nearby for remote access.

Two things to confirm before buying:

• Does the app report battery level, and does the lock warn you before it dies?
• Does it accept emergency power — a USB-C port or a 9V contact — if the batteries are completely flat?

If you already own a hub, buy into that hub. If you own nothing, a Matter-over-Thread lock plus a smart speaker with a Thread radio is the most future-proof combination right now.

The locks we would shortlist

These two cover the two decisions above. Both are current products with publicly documented capabilities, and both are widely available in the US.

For owners replacing a deadbolt: the Aqara Smart Lock U100 offers fingerprint, keypad, Apple Home Key and physical key entry in one unit. It is a Zigbee device, so remote access and automations come through an Aqara hub — budget for that if you do not already own one.

For renters or anyone keeping their existing keys: the SwitchBot Lock Pro clamps over your current thumb-turn. It is the least invasive option here, and it can be removed without a trace. Remote access requires a compatible SwitchBot hub.

What to skip

• Locks with no physical key. Convenience is not worth the risk of being locked out by a dead battery or a failed firmware update.
• No-name locks with no compatibility documentation. If the manufacturer does not publish a clear spec sheet, you cannot verify fit or support.
• Anything that requires a hub the maker will not name. "Works with smart home systems" is not a compatibility statement.
• Locks on doors with visible frame damage. Fix the frame first. The lock is not the weak point.

Products mentioned in this guide

Products referenced in this guide, shown with the manufacturer's own photography. We do not publish prices or star ratings — both change faster than any article can be kept accurate.

Frequently asked questions

Note: Compatibility and feature details on this page come from manufacturer documentation and published specifications at the time of writing. Support changes with firmware, so confirm the current details with the manufacturer before you buy.