Aqara U400 Is the First HomeKit Smart Lock With Face ID, Fingerprint, and Apple Home Key in One Body

What it is

The Aqara U400 is a deadbolt-replacement smart lock that combines five unlock methods into one consumer-priced body: face recognition via a dedicated 3D structured-light camera, fingerprint reader on the handle, backlit PIN keypad, Apple Home Key NFC tap, and a physical key override. It ships with Matter-over-Thread, Apple Home compatibility (including Home Key), HomeKit, Google Home, Amazon Alexa, and Samsung SmartThings out of the box. Power is supplied by 8 rechargeable AA batteries with roughly 8-12 months of typical use; a USB-C port on the indoor escutcheon handles emergency power.

Pricing: $329 MSRP at Aqara direct and Amazon, with $299 street pricing on select finishes.

What's interesting

Face recognition on a sub-$400 consumer smart lock is the category-defining feature. 9to5Mac's review framed the U400 as the first HomeKit lock to deliver real 3D face ID rather than 2D camera matching, the same structured-light technique Apple uses on iPhone Face ID. In the review, enrolled users were recognized and unlocked in under one second from two to four feet away, including at night with the IR illuminator.

Apple Home Key is the quiet compatibility win. Home Key support means an iPhone or Apple Watch held near the lock triggers an NFC unlock without opening any app, without unlocking the phone, and without a network connection. For Apple households, this turns the phone itself into the primary credential, the U400 is one of a small number of retail locks that support both Home Key and Matter, ending the usual trade-off between Apple-ecosystem convenience and platform-agnostic hubs.

Matter-over-Thread is the interoperability safety net. Buyers who later switch from Apple Home to Google Home or SmartThings do not need to replace the lock. Thread also keeps the battery budget tight: the U400 reaches a hub via a low-power mesh hop rather than Wi-Fi polling. In practice, Thread's sub-second response time in a Matter environment meets what most users expect from a cloud-connected lock.

The fingerprint reader is positioned on the outside handle rather than a separate pad, which cuts enrollment friction for guests and contractors. Up to 50 fingerprints can be stored with individual schedules; time-limited access codes on the keypad can be scheduled the same way.

Installation is standard deadbolt replacement using existing door prep. Tom's Guide reported end-to-end install in under 30 minutes on a standard 1-3/8" door thickness.

What's missing or unverified

The U400 is bulkier than a typical smart lock. The 3D face camera and keypad stack above a full-height handle, and the indoor escutcheon adds mass for the 8-AA battery bay. For minimalist door aesthetics, the Level Lock Plus remains the cleaner install. For users who value capability over visual restraint, the U400 is a deliberate choice.

Face recognition requires clean enrollment. Users wearing hats, heavy sunglasses, or scarves may fall back to the fingerprint or keypad. 9to5Mac specifically called out ski-mask and balaclava scenarios as fallback-only events.

No option for a mechanical-only install. The U400 requires powered operation, meaning a dead battery locks out the face and fingerprint features entirely until the USB-C emergency port is used or keys are cut for the physical override. Homeowners who prefer a mostly-mechanical backup workflow should check that the brass key cylinder meets their ANSI grade requirement (Aqara publishes ANSI Grade 2).

Aqara's hub is not strictly required for HomeKit and Home Key, but cloud features, remote lock/unlock when away, video doorbell chime integration, Aqara automations, do require either the Aqara Hub M3 or a HomePod mini acting as a Thread border router.

Price sits above basic HomeKit locks ($179-$249) and below commercial-grade Schlage/Yale offerings ($400-$600). The U400's premium over the Schlage Encode Plus at $299 is the 3D face ID plus Thread; buyers who don't want face recognition save $30 with the Encode Plus.

Support ecosystem is improving but still Aqara. Returns, firmware updates, and accessory parts come through Aqara's direct channels; buyers used to Schlage or Yale retail-chain service should factor that in.

Who it's for

Apple households already running HomeKit who want a single lock that delivers Home Key, face ID, fingerprint, and Thread mesh without a second product. Smart-home enthusiasts moving to Matter who want a flagship Thread lock as the anchor device. Households with multiple daily users (family members, housekeepers, contractors) who benefit from 50-fingerprint and per-user keypad codes with schedules.

Not for: renters who cannot replace the deadbolt, buyers who want a minimalist modern aesthetic, or homeowners who rely on mechanical-first operation.

Verdict

The Aqara U400 at $329 is the smart lock to buy in 2026 for Apple Home households that want face ID, fingerprint, Home Key, and Matter-over-Thread in one device. The bulkier profile and power-dependent core are real trade-offs, but no competitor ships the same five unlock methods at the same price. Against the Level Lock Plus (minimal look, no face ID, no keypad) and the Schlage Encode Plus (keypad and Home Key, no face ID, Wi-Fi only), the U400 wins on capability breadth and platform flexibility; it loses on aesthetics. For the feature-maximizing HomeKit buyer, this is the right pick.