Compare Aqara UWB Smart Lock U400 vs Kwikset Obsidian 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.

Reviewers liked app-based control when a compatible platform supported it, but the lock lost points because it lacks its own app and some hub apps could not manage codes.

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 reliable and easy to set up in stronger reviews, though one transcript noted that changing related customization switches required a screwdriver.

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

Battery feedback was mixed: one preview praised warning before batteries died, while later user-oriented evidence reported six-month or five-month battery life concerns.

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.

Bluetooth was a mild drawback rather than a dealbreaker: one reviewer did not mind its absence, but warned it could deter buyers who want phone proximity unlocking.

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

Build quality was praised in the clearest durability evidence, with the lock described as sturdy and jam-free during testing.

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.

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

Door fit looked favorable for standard replacements, with the reviewer saying it should be almost as easy to install in most standard lock enclosures.

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.

Existing hardware reuse was a strength in the replacement scenario, where the reviewer installed it easily after removing a prior Kwikset lock.

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.

Fingerprint-related security earned consistent praise because SecureScreen and coating features reduced the risk of visible touch patterns revealing codes.

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

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

Guest access was one of the most mixed areas: reviewers liked multiple codes and temporary scheduling in some versions, but criticized limited code counts and remote-code gaps in others.

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.

Hub requirements split reviewers: Z-Wave was welcomed by smart-home users, while others treated the required hub as an added burden.

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

Design was the strongest consensus attribute, with repeated praise for the sleek, minimalist, modern, key-free look.

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.

Installation ranged from simple and thoughtfully guided to frustrating, with one reviewer blaming unclear instructions and bolt machining while others completed setup easily.

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

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 praised for intuitive everyday locking and unlocking.

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

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

Locking speed was mixed, with one review praising prompt Alexa locking while another noticed the lock ran a bit slower than normal.

The locking motor drew a clear complaint for being quite loud, even though the same review did not report jams.

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

Locking reliability was positive overall, with reviewers reporting that auto-relock worked every time, the bolt worked fine after setup, and the mechanism did not jam.

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

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 was praised because the keywayless design removes common keyed-entry attack paths.

Pick and bump-key resistance was praised because ditching the keyway removed the risk of picking or forced entry with a bump key.

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 depended heavily on the platform: it worked well through Wink in one review, but other evidence tied remote control to a more expensive hub-enabled setup.

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

Security features were praised across reviews, especially SecureScreen, which reviewers said worked well and helped prevent code guessing from fingerprints.

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 useful but ecosystem-dependent: Z-Wave, SmartThings, Wink, Alexa, and other platforms worked well in some cases, while HomeKit and Google limitations hurt compatibility.

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

Touchscreen feedback was mostly positive for responsiveness and security, but reviewers also noted wake-up misses and glossy smudging.

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

User access management varied sharply by version and platform, from strong scheduled and one-time code support to complaints about no expiring codes or no app-based code changes.

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 divided: some reviewers considered it expensive once hubs or non-connected limitations were included, while one YouTube reviewer called the price good for a keyless Z-Wave lock.

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 well when supported, especially Alexa locking and status checks, but other reviews emphasized that Alexa or Google control required a Z-Wave hub.

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.

Sun and heat exposure was a concern in one user review because the black exterior became uncomfortable for children to touch.