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Door Locks · Head to head

Aqara Smart Lock U400 vs Eufy FamiLock E40

Full Smart Door Locks comparison in 2026

Updated September 2026
Data from Amazon and official Aqara and Eufy sites.
2026 verdict
Aqara Smart Lock U400 has the better all-around case than Eufy FamiLock E40 in 2026, starting with price, connectivity, and Lock/Unlock system.
Aqara Smart Lock U400
Winner
Aqara Smart Lock U400
$269.99
Buy on Amazon USACheck price
It separates itself most clearly on price, connectivity, and Lock/Unlock system, while still looking better on its broader overall balance. You should still consider Eufy FamiLock E40 if rating and doorbell matter more than raw overall balance. For the average buyer, Aqara Smart Lock U400 is the safer choice.
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FeatureAqara Smart Lock U400Eufy FamiLock E40Winner
Price$269.99$299.99Aqara Smart Lock U400
Rating4.14.4Eufy FamiLock E40
ConnectivityBluetooth, Thread Protocol, Other2.4 GHz WiFi, BluetoothAqara Smart Lock U400
Lock/Unlock SystemRemote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical KeyRemote, Bluetooth, Passcode, Fingerprint, Face Recognition, Physical KeyAqara Smart Lock U400
DoorbellNOYESEufy FamiLock E40
Weather ResistanceIP65IP65Tie
Battery Life6 months6 monthsTie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
One-Time PasswordYESYESTie
Periodic PasswordYESYESTie
Anti-peep PasswordYESYESTie
Emergency FingerprintNONOTie
Winner
Aqara

Aqara Smart Lock U400

$269.99
Buy on Amazon USACheck price
  • + Price: $269.99
  • + Connectivity: Bluetooth, Thread Protocol, Other
  • + Lock/Unlock System: Remote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical Key
  • - Rating: 4.1 vs 4.4
  • - Doorbell: NO vs YES

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Aqara Smart Lock U400
  • Eufy FamiLock E40

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Frequently Asked Questions

Which is better overall: Aqara Smart Lock U400 or Eufy FamiLock E40?

Aqara Smart Lock U400 has the stronger overall profile in this comparison, especially for price, connectivity, and Lock/Unlock system.

What is the biggest difference between Aqara Smart Lock U400 and Eufy FamiLock E40?

Price is one of the clearest differences: Aqara Smart Lock U400 lists $269.99, while Eufy FamiLock E40 lists $299.99.

Which one looks better on price?

Aqara Smart Lock U400 is listed at $269.99, while Eufy FamiLock E40 is listed at $299.99. Aqara Smart Lock U400 (better spec).

Who should buy Aqara Smart Lock U400?

Choose Aqara Smart Lock U400 if your priority is price and connectivity and that matters more than rating.

Who should buy Eufy FamiLock E40?

Choose Eufy FamiLock E40 if your priority is rating and doorbell and that matters more than price.

Full comparison table

Compare all 46 Door Locks side by side

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  • 46 Door Locks
  • 55 specs compared
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