Eufy FamiLock S3 Max vs Eufy Smart Lock C220

The Eufy FamiLock S3 Max wins this in-house matchup overall, backed by a longer warranty, tougher weather sealing, broader Matter-based integrations, a one-time guest password and a built-in video doorbell. The Eufy Smart Lock C220 answers with a lower price, longer battery life and more built-in entry methods, including a fingerprint reader.

The Eufy FamiLock S3 Max adds a 2K HDR video doorbell camera, a rear interior screen, and palm-vein unlock on top of a keypad, none of which the Eufy Smart Lock C220 has. The C220 focuses purely on being a fingerprint deadbolt, and in exchange it adds a fingerprint reader that the FamiLock doesn't offer.

Neither one does. The Eufy FamiLock S3 Max relies on its palm-vein scanner, a keypad and a physical key, and the Eufy Smart Lock C220 on its fingerprint reader, a keypad and a physical key, so neither opens with a tap of an iPhone or Apple Watch.

The Eufy Smart Lock C220 runs on 8 AA batteries rated to last noticeably longer than the Eufy FamiLock S3 Max's built-in rechargeable battery, which has to power its camera and screen as well as the lock.

Buyers who want a straightforward, affordable fingerprint deadbolt with longer stretches between battery changes, and don't need a camera or doorbell.

Buyers who want a full smart-entry system, palm-vein unlock, a video doorbell, a digital peephole screen and the widest Matter-based integrations, bundled into a single deadbolt.