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Aqara Smart Lock U400 vs Nuki Smart Lock Pro

Full Smart Door Locks comparison in 2026

Updated June 2026
Data from Amazon and official Aqara and Nuki sites.
2026 verdict
Between Aqara Smart Lock U400 and Nuki Smart Lock Pro, Aqara Smart Lock U400 is the better overall pick in 2026, leading on price, weather resistance, and lock/unlock system. Its clearest strengths are price, weather resistance, and lock/unlock system, and it still looks stronger on one-time password and periodic password. Nuki Smart Lock Pro is the better fit only for buyers who prioritize rating and integrations above everything else here. As a general recommendation, Aqara Smart Lock U400 comes out on top.
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FeatureAqara Smart Lock U400Nuki Smart Lock ProWinner
Price$219.99€269.00Aqara Smart Lock U400
Rating4.24.3Nuki Smart Lock Pro
Weather ResistanceIP65NOAqara Smart Lock U400
IntegrationsGoogle Home, Alexa, Apple HomeKit, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterNuki Smart Lock Pro
Lock/Unlock SystemRemote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical KeyRemote, Bluetooth, Passcode, Fingerprint, Physical KeyAqara Smart Lock U400
One-Time PasswordYESKeypad requiredAqara Smart Lock U400
Periodic PasswordYESKeypad requiredAqara Smart Lock U400
Battery Life6 months6 monthsTie
ConnectivityBluetooth, Thread Protocol, Other2.4 GHz WiFi, Bluetooth, Thread ProtocolTie
Anti-peep PasswordNONOTie
Emergency FingerprintNONOTie
DoorbellNONOTie

Frequently Asked Questions (FAQ)

Which is better overall: Aqara Smart Lock U400 or Nuki Smart Lock Pro?
Aqara Smart Lock U400 has the stronger overall profile in this comparison, especially for price, weather resistance, and lock/unlock system.
What is the biggest difference between Aqara Smart Lock U400 and Nuki Smart Lock Pro?
Price is one of the clearest differences: Aqara Smart Lock U400 lists $219.99, while Nuki Smart Lock Pro lists €269.00.
Which one looks better on price?
Aqara Smart Lock U400 is listed at $219.99, while Nuki Smart Lock Pro is listed at €269.00. Aqara Smart Lock U400 (better spec).
Who should buy Aqara Smart Lock U400?
Choose Aqara Smart Lock U400 if your priority is price and weather resistance and that matters more than rating.
Who should buy Nuki Smart Lock Pro?
Choose Nuki Smart Lock Pro if your priority is rating and integrations and that matters more than price.
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