How many fit
Only 3 of the 25 models checked meet every need here: “Leave the outside of the lock as is”.
3 models fit, out of 25 checkedPicked for one job
Best smart lock for keeping your existing key
Top pick
August Wi-Fi Smart Lock, fourth generation
August Wi-Fi adds direct remote control while keeping the existing outside cylinder, and it needs the least extra hardware to do it.
Why it suits this job
- Documented to fit doors 1.375 to 2 inches thick.
- Phone is listed as an entry option.
- The catch
- You add a keypad as a separate accessory.
- Go with Aqara Smart Lock U200, Silver if
- the need that decides it is keep the lock outside unchanged
More reasons we picked it
- Platforms documented include alexa, apple, google.
- The documented installation is an interior retrofit.
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With the least extra hardware, August Wi-Fi leaves the existing outside cylinder in place and adds direct remote control.
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
How we countedThe count uses each product's current fit ratings for “Leave the outside of the lock as is”. A need with no documented match is not counted.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| August Wi-Fi Smart Lock, fourth generation |
|
| |
| Aqara Smart Lock U200, Silver |
|
| |
| SwitchBot Lock Pro + Keypad Touch + Hub Mini Matter Bundle |
|
|
Decision guide
How to choose for this job
August Wi-Fi retains the existing outside cylinder and gives you direct remote control for the least extra hardware.
What settles this pick
The documented door range runs from 1.375 to 2 inches thick, and a keypad is a separate accessory.
Why Wi-Fi Smart Lock, fourth generation is on top
Phone is among the listed entry options, and the documented door range is 1.375 to 2 inches thick.
When another lock suits you better
When the need that decides it is keep the lock outside unchanged, Aqara Smart Lock U200, Silver is the alternative to pick. The same need also points to SwitchBot Lock Pro + Keypad Touch + Hub Mini Matter Bundle.
What this page can’t tell you
- Mortise and multipoint doors have to be checked for fit separately.
- Firmware updates can change what a platform supports.
- A sound door and strike are still needed, whatever consumer lock you pick.
3 options
The top pick and the alternatives
August, AUG-SL05-M01-S01
Wi-Fi Smart Lock, fourth generation
Phone is among its entry options, and the documented door range is 1.375 to 2 inches thick.
Top pick ifleave the outside of the lock alone and still have a physical key as backup
Key facts
- Documented to fit doors 1.375 to 2 inches thick.
- Phone is listed as an entry option.
The catch
You add a keypad as a separate accessory.
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.
Pick this instead ifthe need that decides it is keep the lock outside unchanged
Key facts
- Entry options include fingerprint, home-key, keypad, phone.
- The documented platform list includes apple, google, alexa, matter.
The catch
Controlling it remotely through Matter takes a compatible Matter controller and a Thread border router.
SwitchBot, Lock Pro Bundle
Lock Pro + Keypad Touch + Hub Mini Matter Bundle
Documented platforms include apple, google, alexa, matter. Fingerprint, keypad and phone are among the entry options.
Pick this instead ifthe need that decides it is keep the lock outside unchanged
Key facts
- Fingerprint, keypad and phone are listed as entry options.
- The documented platform list includes apple, google, alexa, matter.
The catch
In Apple Home the bundle is controlled through Matter, yet Apple Home Key tap-to-unlock is not supported.
Ready to buy
See today’s price and what owners say
Top pick for this job
August Wi-Fi Smart Lock, fourth generation
Documented to fit doors 1.375 to 2 inches thick.
See price & reviews on AmazonPick this instead if
Aqara Smart Lock U200, Silver
the need that decides it is keep the lock outside unchanged
See price & reviews on AmazonWe may earn a commission from qualifying Amazon purchases. How we make money