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Aqara Smart Lock U400 vs Nuki Smart Lock Ultra

Full Smart Door Locks comparison in 2026

Updated June 2026
Data from Amazon and official Aqara and Nuki sites.
2026 verdict
In 2026, the recommendation leans toward Aqara Smart Lock U400 over Nuki Smart Lock Ultra, driven by price, weather resistance, and lock/unlock system. Its strongest advantages show up in price, weather resistance, and lock/unlock system, with one-time password and periodic password helping widen the gap. The only strong reason to choose Nuki Smart Lock Ultra is if rating and integrations is more important to you than the overall verdict. That is enough to make Aqara Smart Lock U400 the better pick for most buyers.
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FeatureAqara Smart Lock U400Nuki Smart Lock UltraWinner
Price$219.99€349.00Aqara Smart Lock U400
Rating4.24.5Nuki Smart Lock Ultra
Weather ResistanceIP65NOAqara Smart Lock U400
IntegrationsGoogle Home, Alexa, Apple HomeKit, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterNuki Smart Lock Ultra
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 Ultra?
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 Ultra?
Price is one of the clearest differences: Aqara Smart Lock U400 lists $219.99, while Nuki Smart Lock Ultra lists €349.00.
Which one looks better on price?
Aqara Smart Lock U400 is listed at $219.99, while Nuki Smart Lock Ultra is listed at €349.00. 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 Ultra?
Choose Nuki Smart Lock Ultra if your priority is rating and integrations and that matters more than price.
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