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, extra password options 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 and Apple Home Key support.

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 and Apple Home Key support that the FamiLock doesn't offer.

Only the Eufy Smart Lock C220 supports Apple Home Key, letting you unlock with an iPhone or Apple Watch. The Eufy FamiLock S3 Max instead relies on its palm-vein scanner, a keypad, and a physical key for entry.

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 Apple Home Key support and 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.