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Aqara Smart Lock U400 vs ULTRALOQ Bolt SE

Full Smart Door Locks comparison in 2026

Updated October 2026
Data from Amazon and official Aqara and ULTRALOQ sites.
2026 verdict
If you carry an iPhone and want the door to open as you walk up, the Aqara Smart Lock U400 is the more advanced lock, but the ULTRALOQ Bolt SE is the better buy for almost everyone else.
ULTRALOQ Bolt SE
Winner
ULTRALOQ Bolt SE
$89.99$99.9910% OFF

Last recorded price

Buy on Amazon USA
The ULTRALOQ Bolt SE combines a fingerprint reader, a 50-code keypad, built-in Wi-Fi and Matter over Thread with an 18-month battery rating, at a lower price and with a more settled reliability record. The Aqara Smart Lock U400 is the ambitious one: ultra-wideband hands-free unlock with an iPhone or Apple Watch, Apple Home Key, a fast motor, a rechargeable battery with a USB-C emergency port and an IP65 outer panel, all over Matter over Thread. Both work with Apple Home, Alexa, Google Home, SmartThings and Home Assistant, though the U400 needs an Aqara hub for Google and Alexa. Buy the ULTRALOQ Bolt SE for a dependable fingerprint deadbolt, and the Aqara Smart Lock U400 for hands-free UWB entry on an iPhone.
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FeatureAqara Smart Lock U400ULTRALOQ Bolt SEWinner
Price$269.99$89.99ULTRALOQ Bolt SE
Rating4.14.3ULTRALOQ Bolt SE
Battery Life6 months18 monthsULTRALOQ Bolt SE
Lock/Unlock SystemRemote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical KeyRemote, Bluetooth, Passcode, Fingerprint, Physical KeyAqara Smart Lock U400
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
One-Time PasswordYESYESTie
Periodic PasswordYESYESTie
Emergency FingerprintNONOTie
DoorbellNONOTie

What the differences mean

Hands-free entry

The Aqara Smart Lock U400 is one of the first deadbolts with ultra-wideband unlocking, so it opens as you approach with an iPhone or Apple Watch. The ULTRALOQ Bolt SE needs a fingerprint touch, a code or the app, though its reader is fast once you reach for it.

Build

The Aqara Smart Lock U400 is fast and capable but owners call its housing and battery cover plasticky for the price. The ULTRALOQ Bolt SE, at a lower price, is described as solid and has come through hard weather for at least one owner.

Power

Both skip disposable batteries, but differently. The Aqara Smart Lock U400 uses a built-in rechargeable pack rated around six months with a USB-C emergency port. The ULTRALOQ Bolt SE runs on four AA cells rated at 18 months, easy to swap but no rechargeable convenience.

Hub needs

The Aqara Smart Lock U400 reaches Apple Home and Home Assistant directly over Matter, but Google Home and Alexa need an Aqara hub. The ULTRALOQ Bolt SE reaches all four major platforms over Matter with no extra hub, only a Thread border router.

Reliability track record

The ULTRALOQ Bolt SE has a settled record and a lifetime mechanical warranty. The Aqara Smart Lock U400 is a very recent release, so its long-term durability is still unproven, and early buyers already note finicky fingerprint enrollment.

Which one to buy if

Aqara

Aqara Smart Lock U400

Prime exclusive deal
$269.99

Last recorded price

Buy on Amazon USA
  • + Lock/Unlock System: Remote, Bluetooth, Passcode, Fingerprint, NFC Tag, Apple Home Key, Physical Key
  • - Price: $269.99 vs $89.99
  • - Rating: 4.1 vs 4.3
Winner
ULTRALOQ

ULTRALOQ Bolt SE

10% OFF
Prime exclusive deal
$89.99
$99.99

Last recorded price

Buy on Amazon USA
  • + Price: $89.99
  • + Rating: 4.3
  • + Battery Life: 18 months
  • - 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 are won over by the ultra-wideband unlock, describing the door opening like magic a moment before they touch the handle, and by a motor several say is two to three times faster than their old Schlage or Yale. They praise the rechargeable USB-C battery, Apple Home Key, and an easy install of about 30 to 90 minutes, while criticizing a plasticky housing and battery cover for the premium price, a confusing HomeKit and Thread setup, occasional dead UWB, and battery that ships low. ULTRALOQ Bolt SE owners keep coming back to value: four ways to unlock with no monthly fee, a ten-minute physical install, and support called excellent, with setup frustration around Wi-Fi and Matter pairing and some batteries draining faster than the 18-month claim as the recurring gripes.

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
  • ULTRALOQ Bolt SE

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Frequently Asked Questions

Which is better overall: Aqara Smart Lock U400 or ULTRALOQ Bolt SE?

The ULTRALOQ Bolt SE for most buyers, on price, built-in fingerprint and keypad, and a settled record. The Aqara Smart Lock U400 wins for hands-free UWB unlocking on an iPhone or Apple Watch.

Does the ULTRALOQ Bolt SE have ultra-wideband unlocking?

No. UWB hands-free unlock is a feature of the Aqara Smart Lock U400. The ULTRALOQ Bolt SE opens with a fingerprint, a keypad code, the app or a physical key.

Do both have Apple Home Key?

Only the Aqara Smart Lock U400 has Apple Home Key, for tap-to-unlock with an iPhone or Apple Watch. The ULTRALOQ Bolt SE works in Apple Home over Matter but has no Home Key.

Can both work with Google Home and Alexa?

Yes, but the Aqara Smart Lock U400 needs an Aqara hub for Google Home and Alexa, while the ULTRALOQ Bolt SE reaches those platforms over Matter with no brand hub.

How is each one powered?

The Aqara Smart Lock U400 uses a built-in rechargeable battery rated around six months with a USB-C emergency port. The ULTRALOQ Bolt SE uses four AA batteries rated at 18 months.

Which one feels more premium?

The ULTRALOQ Bolt SE, surprisingly, is described as solid, while several Aqara Smart Lock U400 owners find the housing and battery cover plasticky for the price.

Full comparison table

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