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Door Locks · Head to head

Aqara Smart Lock U400 vs Nuki Smart Lock Pro

Full Smart Door Locks comparison in 2026

Updated September 2026
Data from Amazon and official Aqara and Nuki sites.
2026 verdict
Aqara Smart Lock U400 wins on weather resistance, unlock methods and password features.
Aqara Smart Lock U400
Winner
Aqara Smart Lock U400
$269.99
Buy on Amazon USACheck price
Its outer panel is rated IP65 for dust and heavy rain, and it builds in fingerprint, touchscreen keypad, NFC, Apple Home Key and UWB hands-free unlocking with one-time, periodic and anti-peep passwords, where the Nuki keeps entry minimal and sells keypad and fingerprint as accessories. Nuki Smart Lock Pro answers with a lower price, a higher owner rating, a 2-year warranty and broader native integrations including Google Home and Alexa without extra hardware, plus built-in Wi-Fi and its signature minutes-long European-cylinder retrofit with geolocation auto-unlock. Both support Matter, HomeKit and Home Assistant with roughly 6-month batteries. For the most capable front door, the Aqara Smart Lock U400 takes it; refined Euro-door retrofits stay Nuki territory.
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FeatureAqara Smart Lock U400Nuki Smart Lock ProWinner
Price$269.99€269.00Nuki Smart Lock Pro
Rating4.14.3Nuki Smart Lock Pro
Weather ResistanceIP65NOAqara Smart Lock U400
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
Anti-peep PasswordYESNOAqara Smart Lock U400
Battery Life6 months6 monthsTie
ConnectivityBluetooth, Thread Protocol, Other2.4 GHz WiFi, Bluetooth, Thread ProtocolTie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
Emergency FingerprintNONOTie
DoorbellNONOTie
Winner
Aqara

Aqara Smart Lock U400

$269.99
Buy on Amazon USACheck price
  • + Weather Resistance: IP65
  • + Lock/Unlock System: Remote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical Key
  • + One-Time Password: YES
  • - Price: $269.99 vs €269.00
  • - Rating: 4.1 vs 4.3
Nuki

Nuki Smart Lock Pro

€269.00
Buy on Amazon GermanyCheck price
  • + Price: €269.00
  • + Rating: 4.3
  • - Weather Resistance: NO vs IP65
  • - Lock/Unlock System: Remote, Bluetooth, Passcode, Fingerprint, Physical Key vs Remote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical Key

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
  • Nuki Smart Lock Pro

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Frequently Asked Questions

Which is better overall: Aqara Smart Lock U400 or Nuki Smart Lock Pro?

Aqara Smart Lock U400 wins with its IP65 panel, built-in fingerprint, keypad, NFC, Home Key and UWB approach-unlock, plus guest passwords. Nuki Smart Lock Pro counters with a lower price, higher rating, 2-year warranty and hub-free Google and Alexa support.

What is the biggest difference between Aqara Smart Lock U400 and Nuki Smart Lock Pro?

Entry hardware. The Aqara puts a weatherproof exterior panel with fingerprint, keypad and NFC on the door and adds UWB hands-free unlocking. The Nuki is interior-only on a European cylinder: sleek and quick to fit, but keypad or fingerprint entry costs extra.

Which integrates more easily?

The Nuki Smart Lock Pro: Google Home, Alexa, HomeKit, SmartThings, Home Assistant and Matter all work natively. The Aqara Smart Lock U400 handles HomeKit, Home Assistant and Matter over Thread, but needs an Aqara hub for Google Home and Alexa.

Do both auto-unlock as you arrive?

Differently. The Nuki Smart Lock Pro uses geolocation to unlock hands-free as you approach with your phone. The Aqara Smart Lock U400 uses UWB precision from an iPhone or Apple Watch, opening the instant you reach the door (a Thread-enabled Apple hub is required).

Who should buy Aqara Smart Lock U400?

Choose Aqara Smart Lock U400 for a fully equipped, IP65-sealed smart door with every unlock method built in, especially in Apple households that can exploit UWB and Home Key.

Who should buy Nuki Smart Lock Pro?

Choose Nuki Smart Lock Pro for a premium, better-rated Euro-cylinder retrofit with native voice assistant support, built-in Wi-Fi, a 2-year warranty and a clean interior-only look.

Full comparison table

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