Smart locks & entry / platform-explainer
Apple Home Key smart locks: requirements and limitations
What Home Key needs on your iPhone, Watch and home hub, how it differs from a lock that only works in Apple Home, and where Matter and UWB fit.
Platform matrix
| Device | Apple Home | Google Home | Alexa | SmartThings | Home Assistant |
|---|---|---|---|---|---|
| Aqara Smart Lock U400 | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread |
| Aqara Smart Lock U300 | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread |
| Aqara Smart Lock U200 | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread |
| Aqara Smart Lock U100 | Native HomeKit (BLE/Thread) | Via bridge Matter bridge | Via bridge Matter bridge | Via bridge Matter bridge | Via bridge Matter bridge |
| Aqara Smart Lock U50 | Native HomeKit (BLE/Thread) | Unknown | Unknown | Unknown | Unknown |
| Yale Assure Lock 2 Plus YRD450 (Bluetooth or Wi-Fi) | Native HomeKit (BLE/Thread) | Native Cloud skill/integration | Native Cloud skill/integration | Unknown | Native Bluetooth (local) |
| Schlage Sense Pro | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread | Via Matter Matter over Thread |
Each cell is a sourced record; requirements and limits per device are listed below the article. "Unknown" means no source we accept states it either way.
What you need
- A lock whose maker states Home Key support. Working with Apple Home is not enough.
- A supported iPhone or Apple Watch; each maker publishes its own minimum (for example Yale: iPhone XS or later on iOS 15+, Apple Watch Series 4+ on watchOS 8+).
- An Apple home hub (HomePod or Apple TV) to share keys, unlock remotely and run automations; a Thread-enabled hub for UWB hands-free on locks that offer it.
Home Key is a lock feature, not an Apple Home feature. Every lock that works with Apple Home can be locked from the Home app, but only locks whose maker has built in Home Key let you tap an iPhone or Apple Watch to open the door. Check for the words “Home Key” or “home keys in Apple Wallet” on the lock maker’s page.
What Home Key does
From Apple’s guide and platform security notes:
- With Express Mode on, you hold the iPhone or Watch near the lock to unlock. You do not open an app or authenticate first.
- When a Home Key lock is added, every resident of your Apple home gets a key automatically. The home owner manages who has access in the Home app.
- Guests get access codes, not keys. You create a code in the Home app (Manage Access › Add Guest). Apple notes that not all Home app-compatible locks support access codes.
- It works over NFC. Several makers, Aqara among them, say tap-to-unlock still works when the iPhone has run out of battery.
What you need
| Requirement | What the sources say |
|---|---|
| iPhone / Watch | Set per lock maker. Yale (Assure Lock 2 Plus): iPhone XS or later on iOS 15+, or Apple Watch Series 4 or later on watchOS 8+. |
| Home hub | Aqara (U100) says an Apple home hub is required for remote unlock and HomeKit automations. Sharing keys with household members also runs through the Home app’s home. |
| Hands-free (UWB) | Only on locks that offer it. Schlage (Sense Pro): Thread-enabled Apple home hub, iPhone 11 or later (not SE 2/3 or 16e) on iOS 18.5+, or Apple Watch Series 6+ (not SE) on watchOS 11.5+. Aqara (U400): a Thread-enabled Apple home hub and select iPhone and Watch models. |
Home Key vs “works with Apple Home”
| Works with Apple Home | Home Key | |
|---|---|---|
| Lock and unlock in the Home app | Yes | Yes |
| Siri and automations (with a home hub) | Yes | Yes |
| Tap iPhone or Watch to unlock | No | Yes |
| Automatic keys for household members | No | Yes |
Yale’s Assure Lock 2 lineup shows the difference within one family. The standard and Touch models work with Apple Home, but only the Plus offers Home Key (see the Yale Assure Lock 2 guide).
Where Matter fits
Home Key and Matter are separate. A Matter over Thread lock (Aqara U200, U300 or U400, or Schlage Sense Pro) joins Apple Home through Matter and adds Home Key as the maker’s own feature. A Matter lock without Home Key (the Yale Smart Lock with Matter, as far as Yale’s pages state) still works in the Home app, but not as a Wallet key.
Apple has committed to supporting the cross-platform Aliro standard in its wallet. That is a separate standard; see Aliro explained.
Common limitations
- Android users in the same household cannot use Apple home keys. Schlage, for example, says they manage the Sense Pro through the Schlage Home app.
- Requirements are per lock. The minimum iPhone and OS differ between makers and between tap and hands-free unlock. Use the lock maker’s current page, not a generic list.
- Keep a fallback. Home Key is one credential among several. Locks in the compatibility matrix also offer a keypad, a physical key or both.
Known limitations
- Aqara Smart Lock U400: UWB hands-free unlock works with select iPhone and Apple Watch models and requires a Thread-enabled Apple home hub (HomePod mini or Apple TV 4K, per Aqara).
- Aqara Smart Lock U400: Aqara states a Thread-enabled Matter controller of the chosen ecosystem is required.
- Aqara Smart Lock U300: Platform support comes from Matter certification; Aqara does not publish a per-platform feature list for this model.
- Aqara Smart Lock U300: Keypad PIN management over Matter depends on the lock exposing Matter user-management features; check the Get lock info action before relying on it.
- Aqara Smart Lock U200: Platform support comes from Matter certification; Aqara does not publish a per-platform feature list for this model.
- Aqara Smart Lock U200: Keypad PIN management over Matter depends on the lock exposing Matter user-management features; check the Get lock info action before relying on it.
- Aqara Smart Lock U100: An Apple home hub is required for remote unlock and HomeKit automations (per Aqara).
- Aqara Smart Lock U100: Aqara: built on Zigbee; Matter support requires a Matter-supported Aqara hub plus a Matter controller.
- Aqara Smart Lock U100: Aqara lists door status and logging as "available soon" on the product page.
- Aqara Smart Lock U50: Aqara lists Apple Home and Home Key support; it does not state hub requirements for the U50 on the pages we checked.
- Aqara Smart Lock U50: The U50 spec sheet lists Zigbee, Bluetooth 5.0 and NFC. We found no Aqara statement on which hubs bridge it to this platform, so this cell stays Unknown.
- Yale Assure Lock 2 Plus: Key-free touchscreen only; no fingerprint version of the Plus.
- Yale Assure Lock 2 Plus: Needs the Wi-Fi model (YRD450-N-WF1) or the Yale Wi-Fi Smart Module on the Bluetooth model; Wi-Fi models need 2.4 GHz.
- Yale Assure Lock 2 Plus: Yale lists the Z-Wave Plus Smart Module for Assure Lock 2 (including YRD450) as "Coming Soon"; we found no current SmartThings route for the Plus.
- Yale Assure Lock 2 Plus: Local Bluetooth control needs the lock's offline key; the Yale cloud integration can provision it if the account holds the key.
- Yale Assure Lock 2 Plus: Some locks only push state updates while paired with HomeKit; HomeKit Controller and Yale Access Bluetooth cannot both control the lock in one Home Assistant instance.
- Schlage Sense Pro: Hands-free unlock needs a Thread-enabled Apple home hub, iPhone 11 or later (not SE 2/3 or 16e) on iOS 18.5+, or Apple Watch Series 6+ (not SE) on watchOS 11.5+.
- Schlage Sense Pro: Schlage: guest access codes, history, auto-lock and hands-free modes need the Schlage Home app.
Sources
Change log
- — First published.
Related records
- Aliro explained: what the new smart-lock key standard does and does not do
- Aqara U-series smart locks: compatibility by model (U50, U100, U200, U300, U400)
- Matter smart locks in Home Assistant: what works and what to check
- Smart lock compatibility matrix: Apple, Google, Alexa, SmartThings, Home Assistant