The catch
Aqara Smart Lock U400, Black
A deadbolt replacement alters the exterior hardware and the key plan.
Side by side
Aqara Smart Lock U400 vs Aqara Smart Lock U200: U200 keeps your exterior keys, and U400 adds supported approach unlocking
Quick verdict
If you can replace the deadbolt and want UWB approach unlocking with supported Apple hardware, U400 is the choice. If keeping the existing exterior cylinder and keys matters more, U200 is. Home-key taps and fingerprint entry come on both, but U200's retrofit layout and separate keypad make for a different installation than U400's replacement lock.
Before you buy
Why, and what it costs you
Keeping a key and keeping your current key are not the same
Each has a mechanical recovery path. U200 keeps the compatible cylinder already fitted to your door, whereas U400 supplies a replacement lock, so preserving an existing keyed system takes a separate rekeying decision.
Where this comes from
Aqara calls U200 a retrofit that keeps the original key. U400 is a replacement deadbolt that comes with keys and has a rekeyable design.
The catch
Aqara Smart Lock U200, Silver
Has no documented UWB approach-unlock feature.
Aqara Smart Lock U400, Black
- Why pick it
- Unlock on approach with UWB, using compatible Apple devices and a Thread-enabled Apple home hub
- Take out the deadbolt and put in one integrated exterior keypad and fingerprint unit
- The catch
- A deadbolt replacement alters the exterior hardware and the key plan.
Aqara Smart Lock U200, Silver
- Why pick it
- Hold on to the compatible existing exterior cylinder and keys
- Mount the included separate keypad somewhere easier to reach
- The catch
- Has no documented UWB approach-unlock feature.
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What this page compares
How do Aqara U400 and U200 differ on hands-free Apple entry, retaining existing keys, keypad placement and the Thread hardware each installation needs?
If you can replace the deadbolt and want UWB approach unlocking with supported Apple hardware, U400 is the choice. If keeping the existing exterior cylinder and keys matters more, U200 is. Home-key taps and fingerprint entry come on both, but U200's retrofit layout and separate keypad make for a different installation than U400's replacement lock.
Which one fits
Pick the situations that sound like you
I have to keep the existing outside cylinder and keys
U200 is a retrofit for a compatible lock. U400 replaces the deadbolt.
- Aqara Smart Lock U400, Black
- Not suitable
- Aqara Smart Lock U200, Silver
- Better fit
I want approach unlocking through supported Apple UWB
This capability is documented for U400 with compatible devices and an Apple Thread home hub.
- Aqara Smart Lock U400, Black
- Better fit
- Aqara Smart Lock U200, Silver
- Not suitable
A home-key tap or fingerprint is all I need
Those entry methods come with both, which leaves installation fit to decide.
- Aqara Smart Lock U400, Black
- Good
- Aqara Smart Lock U200, Silver
- Good
I want the keypad positioned separately
The separate keypad included with U200 needs its own suitable mounting and power plan.
- Aqara Smart Lock U400, Black
- Not suitable
- Aqara Smart Lock U200, Silver
- Better fit
I want remote control over Matter without a controller or Thread network
That integration requires suitable Matter and Thread infrastructure on both.
- Aqara Smart Lock U400, Black
- Not suitable
- Aqara Smart Lock U200, Silver
- Not suitable
In practice
Differences you will notice
Keeping a key and keeping your current key are not the same
Each has a mechanical recovery path. U200 keeps the compatible cylinder already fitted to your door, whereas U400 supplies a replacement lock, so preserving an existing keyed system takes a separate rekeying decision.
How we worked this out
Aqara calls U200 a retrofit that keeps the original key. U400 is a replacement deadbolt that comes with keys and has a rekeyable design.
A UWB-capable phone covers only part of U400’s setup
An approach-unlock plan also needs the Apple device combination that Aqara supports, plus a Thread-enabled Apple home hub. An iPhone by itself doesn’t prove that this hands-free feature will work.
How we worked this out
On the U400 page, UWB unlocking is explicitly conditioned on select iPhone or Apple Watch models and a Thread-enabled Apple home hub.
Two power-maintenance points come with U200
The interior motor and the separate keypad have independent power. Recharging the lock doesn’t take the place of keypad batteries, unless you install the documented wired keypad supply.
How we worked this out
U200 specifies a rechargeable lock battery along with four AAA keypad batteries or a 12 to 24 V AC/DC keypad input. The lock battery in U400 is rechargeable and integrated.
Option A
Aqara, DL-D06E
Smart Lock U400, Black
Fingerprint access, Apple home key and UWB approach unlocking on supported devices come together in this Matter-over-Thread deadbolt.
- Best for
- Unlock on approach with UWB, using compatible Apple devices and a Thread-enabled Apple home hub
Facts we checked
- Installation: Full deadbolt replacement
- Hands-free approach entry: UWB with supported Apple hardware
- Apple home key and fingerprints: Both supported
- Exterior keypad layout: Integrated with replacement exterior panel
Option B
Aqara, EL-D02E
Smart Lock U200, Silver
It lists apple, google, alexa, matter among its documented platforms, with fingerprint, home-key, keypad and phone as entry options.
- Best for
- Hold on to the compatible existing exterior cylinder and keys
Facts we checked
- Installation: Interior retrofit with separate keypad
- Hands-free approach entry: No UWB approach entry documented
- Apple home key and fingerprints: Both supported
- Exterior keypad layout: Separate included keypad
Spec by spec
Where they really differ
| Spec | Aqara Smart Lock U400, Black | Aqara Smart Lock U200, Silver | In practice |
|---|---|---|---|
| Installation | Full deadbolt replacement | Interior retrofit with separate keypad | Compatible outside hardware stays with U200 and is replaced by U400. |
| Hands-free approach entry | UWB with supported Apple hardware | No UWB approach entry documented | Tapping a home key and unlocking hands-free on approach are separate capabilities. |
| Apple home key and fingerprints | Both supported | Both supported | Choosing U400 isn’t required for basic tap and fingerprint access. |
| Exterior keypad layout | Integrated with replacement exterior panel | Separate included keypad | With U200 come a second mounting position and a separate power supply. |
| Power | Rechargeable lock battery | Rechargeable lock battery plus AAA or wired keypad power | Power for the U200 keypad must be planned separately from the motor unit. |
| Matter connection | Matter over Thread | Matter over Thread | For ecosystem integration, both require a suitable controller and Thread infrastructure. |
Trade-offs
What each pick costs you
With Aqara Smart Lock U400, Black
- Specific Apple devices and home-hub support are what UWB entry depends on.
With Aqara Smart Lock U200, Silver
- Mounting is needed for the separate keypad, along with its own battery or wired power.
Change of plan
When the answer changes
No change may be made to the exterior lock and keys
Go with Aqara Smart Lock U200, Silver. For a compatible lock, U200 is the retrofit option.
You are buying for supported Apple UWB approach unlock
Go with Aqara Smart Lock U400, Black. That hands-free entry feature is documented for U400.
I need remote control over Matter with no Thread border router
Neither model fits. Without it, neither is ready for the Matter remote-control plan requested.
Decision guide
How to decide
Replacing the deadbolt and wanting UWB approach unlocking with supported Apple hardware points to U400. Keeping the existing exterior cylinder and keys points to U200. Both offer home-key taps and fingerprint entry, but U200 is a retrofit with a separate keypad, which makes for a different installation from the U400 replacement lock.
Begin with the hardware you may change
When the outside of the door or the existing key system has to stay as it is, U200 is the relevant option. Even so, not every deadbolt is guaranteed to fit, so check tailpiece and cylinder compatibility, interior space and landlord permission. U400 is for a full replacement using the specified strike hardware.
Tell approach unlocking apart from a phone tap
Tapping compatible Apple hardware and using fingerprints work on both models. What U400 adds is UWB approach unlocking, and that depends on a supported Apple setup. Before paying for that particular convenience, check your exact phone, watch and home hub against Aqara's current compatibility guidance.
Think through the separate keypad
With U200 you can position the keypad away from the lock body. That can improve reach, yet it adds a mounting task and another battery supply unless you wire it correctly. The exterior controls on U400 stay together. Pick the arrangement that suits the door and the people who use it.
What this page can’t tell you
- Approach detection, fingerprint accuracy and installation on your door have not been tested by us. A Matter badge alone does not show that every ecosystem feature or hub combination works.
By the numbers
What the data shows
What we found across the smart locks we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Aqara Smart Lock U400, Black |
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| Aqara Smart Lock U200, Silver |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Aqara Smart Lock U400, Black
Unlock on approach with UWB, using compatible Apple devices and a Thread-enabled Apple home hub
See price & reviews on AmazonAqara Smart Lock U200, Silver
Hold on to the compatible existing exterior cylinder and keys
See price & reviews on AmazonEach link opens in a new tab.
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