How Apple Home Key Works With Smart Locks

By Matthew Easterday · Published Jul 18, 2026

Hold an iPhone near a compatible deadbolt and the bolt turns. There’s no app to open, and with Express Mode on the phone skips the Face ID prompt too. The newest locks go further with Ultra Wideband (UWB), which starts unlocking the door before your hand reaches the handle.

What is Apple Home Key?

Home Key is Apple’s digital door key. When you pair a supported lock in the Home app, a key card is automatically added to Apple Wallet on your iPhone, sitting next to your credit cards and car keys. Every resident in your Home household gets their own key automatically.

To unlock, you hold your iPhone or Apple Watch near the lock’s NFC target. Because the credential lives in Wallet’s secure element, the interaction is a direct, encrypted handshake between your device and the lock, and Apple never learns which door you opened.

How does the NFC tap-to-unlock work?

The tap uses near-field communication, a short-range radio that only works within a couple of centimeters. Your device and the lock exchange a cryptographic proof that your key is valid, and the deadbolt turns.

Two settings round it out. With Express Mode enabled, the phone doesn’t need to be woken or unlocked first; hold it to the reader and the door opens, and if you’d rather approve each unlock with Face ID, you can switch Express Mode off per device in Wallet settings. Power Reserve covers the flat-battery case, keeping the key alive for up to five hours after your iPhone’s battery appears dead.

The tap is a local interaction. It does not need your Wi-Fi or the internet.

What’s new with Ultra Wideband hands-free unlock?

In 2026 a wave of locks added UWB, which changes the experience from “tap” to “just walk up.” UWB gives centimeter-level ranging and direction. Your iPhone or Apple Watch talks to the lock to figure out both how far away you are and which way you’re moving.

The lock uses that direction data as a safeguard, opening only when you’re actively approaching from the expected side of the door. Standing near it from inside, or walking past on the sidewalk, won’t trigger it. Schlage’s Sense Pro calculates speed and trajectory to unlock precisely as you reach the door.

Most UWB locks layer three radios so there’s always a fallback:

This three-radio approach is also the backbone of Aliro, the cross-industry access standard (backed by Apple) whose 1.0 spec landed in early 2026. Aliro standardizes NFC tap and UWB hands-free unlocking so digital keys behave consistently across phones, watches, and platforms.

What do I need to use Apple Home Key?

Any iPhone from the XS forward carries the NFC hardware for the tap, and so does any Apple Watch from Series 4 on. Hands-free unlocking is pickier. For that, the iPhone and the lock both need a U1- or U2-class ultra-wideband chip.

A home hub only enters the picture for remote features. Checking the deadbolt from work, getting an alert when it locks, and running automations all route through one, and since Apple retired the original HomeKit architecture on February 10, 2026, the hub has to be an Apple TV 4K or a HomePod/HomePod mini; an iPad can no longer fill that role.

Which smart locks support Apple Home Key?

Home Key works with select locks from brands including Schlage, Yale, Aqara, Level, Lockly, and ULTRALOQ. Well-known tap-to-unlock models include the Schlage Encode Plus, Yale Assure Lock 2 Plus, Level Lock+, Aqara U100, and Lockly Visage.

For the newer UWB hands-free experience, the field is still small in mid-2026: the Aqara U400 and the Schlage Sense Pro (shipping since June 29, 2026) are the available options, with more UWB locks arriving.

A few buying notes:

• Nearly every Home Key lock still gives you a keypad, and many add fingerprint and a physical key, so guests and non-Apple household members aren’t locked out.
• If you want Thread reliability on Apple Home, look for locks that pair over Matter-over-Thread rather than Bluetooth-only.
• UWB models cost more than their NFC-only equivalents, and the tap covers the same day-to-day unlocking.

Is Apple Home Key secure?

Yes, and the design leans on the same hardware that protects Apple Pay. The credential is stored in the secure element and never leaves it; unlocking is a cryptographic challenge-response, not a copyable code. Because the whole exchange is local, there’s no cloud account to breach for the unlock itself.

UWB adds a physical-layer defense against relay attacks, the precise ranging makes it far harder for an attacker to trick the lock into thinking a distant key is at the door. For hands-free setups, keep Express Mode and approach-detection settings where you’re comfortable, and use the Home app’s per-guest key controls to grant and revoke access.

What I have and haven’t used

Two August locks have been bought for this house, a 2nd generation HomeKit model in July 2017 and a Wi-Fi 4th generation in June 2023.

Apple Home Key is a different matter. August locks are HomeKit-compatible but don’t support Home Key, which needs the lock to carry an NFC reader and an Apple-issued credential. So everything above describes how Home Key works rather than how it feels to use daily, and neither August lock is paired into the current home.

If I get a Home Key lock on the door, I’ll test it and write it up.

Matthew Easterday

Runs the homekit.reviews test home, a real mixed Matter/Thread/HomeKit house. Everything reviewed here was set up, paired, and lived with. See how I test →