Main trade-off
Aqara Smart Lock U50
No UWB or fingerprint access.
Head-to-head
Aqara U50 vs U400: U400 adds supported hands-free approach entry, U50 already accepts home keys
The short answer
U50 covers keypad and Home Key entry with replaceable AA batteries. U400 adds compatible-device UWB hands-free access, fingerprints and native Matter over Thread.
Before you choose
The reasoning and the trade-offs
Home Key alone does not justify UWB hardware
U50 already supplies the tap-to-unlock action.
What this is based on
Both support Home Key. U400's additional convenience is approach-based UWB and fingerprint access, so a buyer who wants only tapping has a smaller functional reason to step up.
Main trade-off
Aqara Smart Lock U400, Black
UWB requires specific Apple hardware.
Aqara Smart Lock U50
- Choose it for
- A deliberate Home Key tap already suits your routine.
- You prefer replacing common AA batteries to charging a pack.
- Main trade-off
- No UWB or fingerprint access.
Aqara Smart Lock U400, Black
- Choose it for
- You have a compatible UWB Apple device and want hands-free entry.
- You want fingerprints as another everyday access method.
- Main trade-off
- UWB requires specific Apple hardware.
About this comparison
Compare Aqara U50 and U400 for Home Key, UWB hands-free entry, fingerprints, battery care and the hubs needed for a complete installation.
U50 covers keypad and Home Key entry with replaceable AA batteries. U400 adds compatible-device UWB hands-free access, fingerprints and native Matter over Thread.
Winner by situation
Start with what you need it to do
You need hands-free UWB entry
U400 can meet this only with compatible devices and home infrastructure.
- Aqara Smart Lock U50
- Not suitable
- Aqara Smart Lock U400, Black
- Depends
You only require Home Key tapping
Both support the deliberate tap action.
- Aqara Smart Lock U50
- Similar
- Aqara Smart Lock U400, Black
- Similar
You require a fingerprint reader
Only U400 includes one.
- Aqara Smart Lock U50
- Not suitable
- Aqara Smart Lock U400, Black
- Better fit
You want AA replacements rather than charging
U50 uses AA cells. U400 uses a rechargeable pack.
- Aqara Smart Lock U50
- Better fit
- Aqara Smart Lock U400, Black
- Not suitable
What matters in practice
The differences that matter
Home Key alone does not justify UWB hardware
U50 already supplies the tap-to-unlock action.
How we reached this conclusion
Both support Home Key. U400's additional convenience is approach-based UWB and fingerprint access, so a buyer who wants only tapping has a smaller functional reason to step up.
Native Matter still needs infrastructure
Moving to U400 changes the required hub type rather than eliminating every hub.
How we reached this conclusion
U50 uses an Aqara Zigbee bridge for Matter. U400 uses Thread and needs the compatible controller and border router required by that ecosystem.
The phone can erase the upgrade benefit
An unsupported phone removes the UWB reason to choose U400.
How we reached this conclusion
UWB access is conditional on compatible Apple hardware. U400 retains fingerprint and keypad access, but its headline hands-free feature should not be assumed for every household device.
Choice A
Aqara, DL-D05D
Smart Lock U50
A keypad deadbolt with Apple Home Key, physical backup keys and Zigbee hub expansion for remote access and smart-home routines.
- Best matched use
- Apple Watch entry without a fingerprint reader
Checked facts
- Four AA batteries power the lock, with a manufacturer estimate of up to six months.
- Apple Home Key, keypad, Bluetooth app access and physical keys are supported.
- A built-in gyroscope supports automatic locking after the door closes.
- The exterior has an IPX5 water-resistance rating.
Choice B
Aqara, DL-D06E
Smart Lock U400, Black
A Matter-over-Thread deadbolt with fingerprint access, Apple home key and supported-device UWB approach unlocking.
- Best matched use
- A home with a suitable Thread controller and a compatible phone or watch
Checked facts
- The manufacturer lists fingerprint, keypad, mechanical key, NFC and supported wallet entry.
- The rechargeable battery can be charged through the interior USB-C port.
- The exterior panel is IP65 rated and the lock uses an internal gyro for door-close auto-lock.
- The selected Amazon model is DL-D06E, not a hub bundle.
Meaningful differences
What changes the fit
| What changes | Aqara Smart Lock U50 | Aqara Smart Lock U400, Black | Why it matters |
|---|---|---|---|
| Hands-free approach unlocking | No UWB entry | UWB entry with supported Apple devices | U400's hands-free benefit depends on the exact phone or Watch and home setup. |
| Fingerprint entry | Not supported | Supported | U400 gives users an alternative to a code or Apple device. |
| Smart-home transport | Zigbee with Aqara Matter bridge | Native Matter over Thread | U400 still needs an appropriate Matter controller and Thread border router for connected features. |
| Power | Four replaceable AA batteries | Rechargeable battery pack | The maintenance routine changes from replacing cells to recharging a pack. |
| Exterior rating | IPX5 | IP65 | U400 adds a specified dust-protection level. Both document water resistance. |
What you give up
Every choice has a cost
If you choose Aqara Smart Lock U50
- Remote Aqara features depend on a compatible hub.
If you choose Aqara Smart Lock U400, Black
- Rechargeable-pack care and Thread infrastructure need planning.
Recommendation switch
The decision flips if...
Your exact Apple device supports UWB and hands-free entry matters
Choose Aqara Smart Lock U400, Black. The added hardware now serves a daily requirement.
Home Key tapping is enough and you want AA power
Choose Aqara Smart Lock U50. U50 meets both needs without adding rechargeable-pack care.
You expect UWB from an unsupported phone
Choose neither. Neither can provide that specific phone's hands-free UWB routine.
What matters in practice
How to make the call
Start with exact devices
Check the supported iPhone and Watch list before paying for hands-free access. An Apple logo alone does not establish UWB support. Home Key tapping remains a separate feature.
Daily entry versus extra methods
U50 is sufficient when a tap or PIN works for everyone. U400 is more compelling when one person wants UWB while another prefers a fingerprint.
Battery care
U50's AA approach is familiar and easy to stock. U400 asks you to follow a charging routine. Neither battery system excuses keeping the supplied mechanical fallback accessible.
What this comparison cannot tell you
- Supported-device lists and firmware can change. No field test of UWB range or unwanted unlock behavior is claimed.
What the facts say
What the comparison shows
Useful conclusions from the current smart locks comparison, followed by the checked facts used to reach them.
Compared set
Only 1 of 25 models checked match every need here: “Tap my phone or watch to enter”, “Have the door unlock as I arrive”, “Unlock with a fingerprint”, and “Build around Matter”.
1 matching model from 25 checkedSee the checked facts and calculation notes
Match countThe count uses the current product-to-need assignments for “Tap my phone or watch to enter”, “Have the door unlock as I arrive”, “Unlock with a fingerprint”, and “Build around Matter”. A need with no documented match does not count.
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Aqara Smart Lock U50 |
|
| |
| Aqara Smart Lock U400, Black |
|
|
|
Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Aqara Smart Lock U50
A deliberate Home Key tap already suits your routine.
See price & reviews on AmazonAqara Smart Lock U400, Black
You have a compatible UWB Apple device and want hands-free entry.
See price & reviews on AmazonLinks open in a new tab.