Eufy FamiLock S3 Max vs Eufy Security Smart Lock S230

The Eufy Security Smart Lock S230 comes out ahead overall in this in-house matchup, winning on price, battery life and its added fingerprint reader. The Eufy FamiLock S3 Max fights back with a built-in video doorbell, a palm-vein scanner and far broader Matter-based smart home integrations, so it's still the pick for buyers who want those extras.

Scope. The Eufy Security Smart Lock S230 is a focused fingerprint deadbolt with built-in Wi-Fi and nothing else. The Eufy FamiLock S3 Max bundles that same core idea with a palm-vein reader, a 2K HDR video doorbell camera, and a rear interior screen that works as a digital peephole.

The Eufy Security Smart Lock S230's built-in battery is rated to last considerably longer between charges than the Eufy FamiLock S3 Max's, whose extra hardware (the doorbell camera and screen) draws more power. The FamiLock does include AAA emergency backup batteries and a USB-C charge port for when it runs low.

The Eufy FamiLock S3 Max, by a wide margin. Its Matter support extends to Apple HomeKit, Samsung SmartThings and Home Assistant on top of Google Home and Alexa, while the Eufy Security Smart Lock S230 only reaches Google Home and Alexa.

Buyers who want a dependable, long-lasting fingerprint deadbolt at a lower price and don't need a doorbell camera or broad Matter integrations.

Buyers who want palm-vein entry, a built-in video doorbell and camera, and the widest possible smart home ecosystem support bundled into one lock, and don't mind paying more and charging it more often.