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Door Locks · Head to head

Aqara Smart Lock U200 vs Aqara Smart Lock U400

Full Smart Door Locks comparison in 2026

Updated September 2026
Data from Amazon and official Aqara site.
2026 verdict
Aqara's retrofit and its full smart deadbolt, and the Aqara Smart Lock U400 is the better lock, mainly for its ultra-wideband hands-free unlock with an iPhone or Apple Watch.
Aqara Smart Lock U400
Winner
Aqara Smart Lock U400
$269.99
Buy on Amazon USACheck price
It adds UWB and NFC radios and Bluetooth on top of Thread, a touchscreen keypad on an IP65 outer panel, a rekeyable key, and forced-entry and door-ajar alerts, and its owners rate it higher. The Aqara Smart Lock U200 is the lower priced of the two and keeps some real advantages: it retrofits over the deadbolt you already have without changing the outside key, it can run on AAA batteries or USB power as backup, and it works with Google Home and Alexa without an Aqara Hub, which the U400 needs for those two. Both offer fingerprint, codes, NFC and Apple Home Key over Matter. Choose the Aqara Smart Lock U400 for walk-up unlocking in an Apple home, and the Aqara Smart Lock U200 for a cheaper retrofit that keeps your existing lock.
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FeatureAqara Smart Lock U200Aqara Smart Lock U400Winner
Price$169.99$269.99Aqara Smart Lock U200
Rating2.74.1Aqara Smart Lock U400
ConnectivityThread ProtocolBluetooth, Thread Protocol, OtherAqara Smart Lock U400
Weather ResistanceIPX5IP65Tie
Battery Life6 months6 monthsTie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
Lock/Unlock SystemRemote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical KeyRemote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical KeyTie
One-Time PasswordYESYESTie
Periodic PasswordYESYESTie
Anti-peep PasswordYESYESTie
Emergency FingerprintNONOTie
DoorbellNONOTie

What the differences mean

Hands-free unlocking

The Aqara Smart Lock U400 has ultra-wideband, so an iPhone or Apple Watch unlocks the door as you walk up, with a Thread Apple Home hub in place. The Aqara Smart Lock U200 supports Home Key by tapping, and its spec sheet lists no UWB.

Installation type

The Aqara Smart Lock U200 retrofits the inside of an existing deadbolt and keeps your outside key. The Aqara Smart Lock U400 replaces the lock with its own outer panel, touchscreen keypad and rekeyable key, a bigger job but a complete smart deadbolt.

Google Home and Alexa

The Aqara Smart Lock U200 lists Google Home and Alexa support directly. On the Aqara Smart Lock U400 both require an Aqara Hub, so a Google or Alexa home should budget for one.

Weather rating

The U400's outer panel is rated IP65 against dust and heavy rain, above the U200's IPX5 splash rating, which matters on an exposed door.

Backup power

Both use a rechargeable battery rated for about 6 months. The Aqara Smart Lock U200 can fall back on AAA batteries or a USB port, while the Aqara Smart Lock U400 has a USB-C emergency port only.

Which one to buy if

What owners say

Owners of both Aqara locks share one frustration: getting the Aqara app, Thread and Apple Home to agree can take a few attempts, and both groups advise patience with setup. Beyond that, their experiences part ways. Aqara Smart Lock U400 owners are delighted by UWB unlocking that opens the door just before they reach for the handle, a motor they call far quicker than their old Schlage or Yale, and a USB-C battery they top up with a power bank; they criticise a plasticky housing for the money, fingerprint enrollment that can be finicky and UWB that does not fire every time. Aqara Smart Lock U200 owners single out Home Key with an Apple Watch and broad platform support, but more of them report calibration failures and locks that grind or fail after roughly a year.

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 U200
  • Aqara Smart Lock U400

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Frequently Asked Questions

Aqara U200 vs U400: which is better?

The Aqara Smart Lock U400, for its UWB hands-free unlock, touchscreen keypad, IP65 outer panel and stronger owner reviews. The Aqara Smart Lock U200 is the cheaper retrofit that keeps your existing deadbolt and works with Google Home and Alexa without an Aqara Hub.

What is the difference between the Aqara Smart Lock U200 and the Aqara Smart Lock U400?

The Aqara Smart Lock U200 is a retrofit that fits over an existing deadbolt, while the Aqara Smart Lock U400 is a complete smart deadbolt with its own outer keypad panel, a rekeyable key and ultra-wideband for walk-up unlocking.

Does the Aqara Smart Lock U200 have UWB?

Its spec sheet lists no UWB. The Aqara Smart Lock U200 supports Apple Home Key by tapping an iPhone or Apple Watch, while ultra-wideband hands-free unlocking is a feature of the Aqara Smart Lock U400.

Do the Aqara Smart Lock U200 and the Aqara Smart Lock U400 need a hub?

Both connect over Matter on Thread and need a Thread border router for it. The Aqara Smart Lock U400 also needs an Aqara Hub for Google Home and Alexa, which the Aqara Smart Lock U200 does not.

Who should buy the Aqara Smart Lock U200?

Buyers who want Home Key, fingerprint and codes while keeping their current deadbolt and key, at the lower price, including Google Home and Alexa households without an Aqara Hub.

Who should buy the Aqara Smart Lock U400?

Apple Home households that want the door to unlock as they approach, plus a full deadbolt with a touchscreen keypad and a weather-sealed outer panel.

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