Door Locks · Head to head

Aqara Smart Lock U100 vs Eufy FamiLock S3

Full Smart Door Locks comparison in 2026

Updated August 2026
Data from Amazon and official Aqara and Eufy sites.
2026 verdict
In 2026, the recommendation leans toward Aqara Smart Lock U100 over Eufy FamiLock S3, driven by price, battery life, and connectivity. It separates itself most clearly on price, battery life, and connectivity, while still looking better on Lock/Unlock system. Eufy FamiLock S3 remains a niche alternative if warranty and doorbell matter more than the rest of the comparison. For most setups, Aqara Smart Lock U100 is the smarter buy.
vs
FeatureAqara Smart Lock U100Eufy FamiLock S3Winner
Price$149.99$299.99Aqara Smart Lock U100
Warranty1 year1.5 yearsEufy FamiLock S3
Battery Life8 months4 monthsAqara Smart Lock U100
ConnectivityBluetooth, Zigbee2.4 GHz WiFiAqara Smart Lock U100
Lock/Unlock SystemRemote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical KeyRemote, Passcode, Physical KeyAqara Smart Lock U100
DoorbellNOYESEufy FamiLock S3
Rating4.14.1Tie
Weather ResistanceIP65IP65Tie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Home Assistant, IFTTT, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
One-Time PasswordYESYESTie
Periodic PasswordYESYESTie
Anti-peep PasswordYESYESTie

Frequently Asked Questions

Which is better overall: Aqara Smart Lock U100 or Eufy FamiLock S3?

Aqara Smart Lock U100 has the stronger overall profile in this comparison, especially for price, battery life, and connectivity.

What is the biggest difference between Aqara Smart Lock U100 and Eufy FamiLock S3?

Price is one of the clearest differences: Aqara Smart Lock U100 lists $149.99, while Eufy FamiLock S3 lists $299.99.

Which one looks better on price?

Aqara Smart Lock U100 is listed at $149.99, while Eufy FamiLock S3 is listed at $299.99. Aqara Smart Lock U100 (better spec).

Who should buy Aqara Smart Lock U100?

Choose Aqara Smart Lock U100 if your priority is price and battery life and that matters more than warranty.

Who should buy Eufy FamiLock S3?

Choose Eufy FamiLock S3 if your priority is warranty and doorbell and that matters more than price.

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Independent · Not sponsoredBrands never pay for placement or rankings. Affiliate commissions never influence our comparisons.
© 2026 Smart Home Compared
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