Aqara Smart Lock U400 vs Eufy FamiLock S3 Max

Aqara Smart Lock U400 wins with its lower price, longer battery life, UWB hands-free unlocking and richer unlock methods including fingerprint, NFC and Apple Home Key. Eufy FamiLock S3 Max counters with a higher rating, 18-month warranty and its built-in video doorbell and camera.

Video versus UWB. The Eufy integrates a 2K HDR doorbell, night-vision camera, 16GB local storage and an interior screen. The Aqara skips video entirely but unlocks the door automatically as you approach with an iPhone or Apple Watch over ultra-wideband.

The Eufy FamiLock S3 Max connects over built-in Wi-Fi with Matter reaching Google, Alexa, HomeKit and SmartThings, no hub needed. The Aqara Smart Lock U400 works with HomeKit and Home Assistant via Thread and Matter, but Google Home and Alexa require an Aqara hub.

The Aqara Smart Lock U400 uses a fingerprint reader plus NFC and Apple Home Key. The Eufy FamiLock S3 Max uses palm-vein recognition, which works in rain and for users whose fingerprints fail, plus a keypad; it has no fingerprint, NFC or Home Key.

Choose Aqara Smart Lock U400 for the most futuristic entry experience in Apple homes: UWB hands-free unlocking, Home Key, fingerprint and an IP65 panel, at the lower price of the pair.

Choose Eufy FamiLock S3 Max to consolidate lock, doorbell and porch camera into one better-rated device with palm entry, local video storage without fees and a rear screen the family can check before opening.