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Aqara Smart Lock U400 vs Nuki Smart Lock Pro

Full Smart Door Locks comparison in 2026

Updated October 2026
Data from Amazon and official Aqara and Nuki sites.
2026 verdict
The Aqara Smart Lock U400 is the more fully equipped door lock of this pair.
Aqara Smart Lock U400
Winner
Aqara Smart Lock U400
$269.99

Last recorded price

Buy on Amazon USA
It builds an IP65 exterior panel, fingerprint, a touchscreen keypad, NFC, Apple Home Key and ultra-wideband hands-free unlocking directly into the door, plus one-time, periodic and anti-peep guest passwords. The Nuki Smart Lock Pro answers with a lower price, a higher owner rating and built-in Wi-Fi that reaches Google Home and Alexa natively, something the Aqara needs an Aqara Hub for. Nuki keeps its own entry hardware minimal by comparison, selling keypad and fingerprint access as a separate accessory and offering no NFC or Apple Home Key at all. Both support Matter, Apple HomeKit and Home Assistant with roughly 6-month batteries. For the most capable front door, the Aqara Smart Lock U400 takes it; a refined European-cylinder retrofit with easier native integrations stays Nuki territory.
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FeatureAqara Smart Lock U400Nuki Smart Lock ProWinner
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

What the differences mean

Entry hardware on the door itself

The Aqara Smart Lock U400 builds fingerprint, a touchscreen keypad, NFC and Apple Home Key directly into its exterior panel. The Nuki Smart Lock Pro keeps its own hardware minimal, Bluetooth and a physical key only, and sells keypad and fingerprint access as a separate accessory.

Guest passwords

The Aqara Smart Lock U400 includes one-time, periodic and anti-peep passwords built in. The Nuki Smart Lock Pro offers one-time and periodic codes only once its separate Keypad accessory is added, and has no anti-peep option at all.

Reaching Google Home and Alexa

The Nuki Smart Lock Pro's built-in Wi-Fi reaches Google Home and Alexa natively, no extra hardware needed. The Aqara Smart Lock U400 needs an Aqara Hub to bridge those same two platforms, working directly only with Apple Home and Home Assistant over Matter.

How each one recognizes you at the door

The Aqara Smart Lock U400 uses ultra-wideband precision from an iPhone or Apple Watch, unlocking the instant you reach the door with a Thread-enabled Apple hub in place. The Nuki Smart Lock Pro uses phone geolocation instead, which needs no special hardware but is less precise about exactly when it fires.

Door type

The Aqara Smart Lock U400 is a full deadbolt replacement with a visible exterior panel, suited to a US-style door. The Nuki Smart Lock Pro mounts inside over an existing European euro-cylinder, leaving the outside of the door untouched.

Price and rating

The Nuki Smart Lock Pro is the cheaper of the two and carries the higher average owner rating, reflecting how much more hardware the Aqara Smart Lock U400 packs onto the door for its price.

Which one to buy if

Winner
Aqara

Aqara Smart Lock U400

Prime exclusive deal
$269.99

Last recorded price

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

Nuki Smart Lock Pro

Prime exclusive deal

Last recorded price

Currently unavailable on Amazon USA
See on Amazon USA
  • + 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

What owners say

Aqara Smart Lock U400 owners rave about the ultra-wideband unlock, describing the door opening as they walk up with an iPhone or Apple Watch, and about a motor that feels two to three times faster than their old deadbolt, though several find the housing plasticky for a lock at this price and note Google Home and Alexa need an extra Aqara Hub. Nuki Smart Lock Pro owners praise how quickly it mounts over an existing euro-cylinder and that built-in Wi-Fi means remote access works without buying an add-on, valuing the strong motor and hands-free auto-unlock on approach, while a handful report a battery that stopped charging after several months and note that keypad or fingerprint entry costs extra on top of an already premium price.

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?

The Aqara Smart Lock U400 wins with its IP65 panel, built-in fingerprint, keypad, NFC, Home Key and UWB approach-unlock, plus every guest password type. The Nuki Smart Lock Pro counters with a lower price, a higher rating and hub-free Google Home 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, and 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 through its built-in Wi-Fi. 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, with a Thread-enabled Apple hub required.

Who should buy Aqara Smart Lock U400?

Choose it 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 it for a premium, better-rated euro-cylinder retrofit with native voice assistant support, built-in Wi-Fi, and a clean interior-only look.

Full comparison table

Compare all 52 Door Locks side by side

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