Compare Aqara UWB Smart Lock U400 vs eufy FamiLock S3 Max Smart Lock

The Aqara app was seen as useful and feature-rich, but reviewers also flagged setup complexity, a Matter-code issue, and a learning curve for customization.

The Eufy app was considered capable and feature-rich, with useful controls and setup help, but one reviewer found it sprawling.

Auto-lock was broadly praised and often described as reliable or well implemented, though one reviewer found Aqara app close-detection sometimes delayed.

Auto-lock was viewed as a meaningful convenience and peace-of-mind feature, especially for families that forget to lock up.

Wrong-try lockout was viewed positively as a useful safeguard against repeated bad attempts.

Battery feedback was mostly positive for USB-C charging, removable/rechargeable design, and long runtime, tempered by concerns about spare or replacement batteries.

The dual-battery design was one of the most praised practical features, although heavy camera use made one reviewer doubt the advertised runtime.

Bluetooth-only use was judged weak for this lock because reviewers saw the U400's main value in Thread/UWB rather than basic Bluetooth operation.

Build quality was viewed positively, with reviewers describing a step up from earlier Aqara locks and solid, well-made hardware.

Build quality drew strong praise, with reviewers describing the lock as robust, durable, and safe-like despite its size.

Camera and doorbell integration was described as practical when paired with Aqara or Apple Home video devices, letting users see visitors and unlock from one screen.

Camera and doorbell performance was mixed-positive: daytime video, field of view, and the indoor screen drew praise, while low-light video, audio, and doorbell-button expectations were caveats.

Door-sense evidence was limited but positive, centered on the built-in gyroscope knowing when the door closes so it can lock without an added sensor.

Door-sense received qualified praise because it can infer door state without a separate sensor, though with some edge-case caveats.

Door fit flexibility was helped by adapters/cross-bore support, with reviewers calling the physical fit detail useful for nonstandard openings.

Door fit/usefulness is context-dependent: glass, windowed, screen, or storm doors can reduce the value of the camera and interior display.

One reviewer valued that the lock could mount without the kind of door drilling required by the previous lock, making the install feel friendlier to existing doors.

Facial recognition was praised when paired with HomeBase, but reviewers treated it as an add-on rather than a built-in core feature.

Feature-update evidence was limited but positive, with one reviewer saying Aqara is good about firmware updates.

Fingerprint access was consistently praised as quick, accurate, consistent, or convenient, especially as a backup when UWB is unavailable.

The exterior finish earned a positive note for resisting fingerprints better than expected.

Finish durability was only lightly covered, but one reviewer said the black metal casing still looked good after use.

Guest access was praised through Home app PIN management and temporary/neighbor-style access options.

Hub requirements were mixed: reviewers liked avoiding an Aqara hub in Apple Home, but still emphasized the need for a Thread border router for full functionality.

HomeBase dependence was a downside when reviewers wanted facial recognition or the most advanced alerts.

Industrial design was the most mixed area: reviewers liked the sleeker, more mature, minimal look, but others called it bulky, plain, or plastic-looking.

Industrial design was seen as modern and premium, though several reviewers noted that the lock is large or visually high-tech.

Installation was usually described as straightforward and fast, with several reviewers finishing quickly, though a few noted tight wiring, small screw holes, or a latch-area snag.

Reviewers generally found setup straightforward and app-guided, though one pre-release unit caused connection and install friction.

Reviewers liked retaining a physical-key fallback, framing it as a useful mechanical backup rather than a compromised smart-only design.

Reviewers treated the physical key override as a useful fallback for emergencies or users who prefer non-smart access.

The keypad was generally usable and responsive, but reviewers also found that it could take extra taps or touches to wake in some cases.

The keypad was generally praised as responsive, visible, and easy to use, with scramble-code support helping privacy.

The keyway/cylinder was viewed positively because the reviewer liked that it could be rekeyed rather than forcing a full lock replacement.

The hidden keyway cover was the weakest physical detail, with one reviewer finding it hard to reseat securely.

Lock/unlock speed was one of the strongest themes, especially with UWB; reviewers described fast reactions, instant Home app response, and few delay caveats.

Lock/unlock responsiveness was excellent in testing, especially with voice commands.

The motorized lock button was praised as making operation easier, particularly for users with limited hand comfort.

Locking reliability was strongly praised, with reviewers repeatedly reporting flawless, rock-solid, or consistently smooth hands-free unlocking.

Locking reliability was consistently strong in the reviews that tested repeated lock/unlock behavior and routines.

Notifications earned praise for adding Apple Watch/iPhone confirmation and a quick relock option after UWB unlocks.

Motion and doorbell notifications were mostly praised for speed and accuracy, with one reviewer noting a small delay.

Palm vein recognition was the clearest strength, repeatedly described as fast, reliable, convenient, and easier than fingerprints, with minor caveats about angle and unlock-only use.

Physical attack resistance drew a caveat: the reviewer appreciated certification but clearly wished the U400 had a stronger Grade 2 rating instead of Grade 3.

Physical attack resistance had limited but positive evidence, with reviewers pointing to solid construction and tough security design.

Pick resistance was praised in reviews that discussed the encrypted cylinder or difficulty of picking the lock.

Remote access was useful when configured, with one reviewer praising fast remote unlock and another noting Aqara-app remote control needs an Aqara hub.

Remote access had limited evidence but was described as quick and reliable.

Security features were praised around UWB precision, encryption-related safeguards, and prevention of unintended inside unlocks or relay-style weaknesses.

Security encryption evidence was limited but positive, centered on the encrypted lock cylinder adding protection.

Smart-home integration was a major strength, with reviewers praising Apple Home, Matter over Thread, responsiveness, major ecosystem support, and future-looking compatibility.

Smart-home integration was the most split area: basic Matter, Alexa, Google, and HomeKit control worked, but advanced lock, camera, and palm features often stayed inside Eufy.

Touchscreen evidence was mixed, with one reviewer naming wake-up attempts as the main complaint.

Touchscreen/keypad usability was supported by positive comments about responsiveness and backlighting.

User access management was positively reviewed for adequate household limits, more granular Aqara controls, and approachable local fingerprint setup.

User access management was praised for making family access easy and supporting different time slots.

Value sentiment was favorable but conditional: reviewers called it worth the upgrade or routine-changing, while also noting the price can feel high.

Value was mixed: reviewers repeatedly called it expensive, but some felt the all-in-one lock, camera, and doorbell package justified the premium.

Voice control received limited but positive evidence, with a reviewer saying they wished they had the supported voice-control lock routine at home.

Voice control worked quickly where tested, especially through Alexa, Siri, or Google lock commands.

Weather resistance came across well: reviewers said it could face the elements, and one real-world test cited rain, snow, ice, and no missed performance.

Weather resistance received limited but positive support tied to the lock’s durable construction for harsh conditions.

Wi-Fi performance was positive overall, with quick setup, steady connectivity, and claimed responsiveness from Wi-Fi 6 support.