The Score
Nuki scores 4.1 out of 5 for noise level, with 82% of 1,800 reviewers rating it positively. This is Nuki's second-strongest category after installation (4.3), and represents one of the most improved metrics from previous generations.
The 82% positive rate tells a clear story: the vast majority of users consider Nuki quiet enough for everyday use, including nighttime operation. The 18% who have concerns mostly fall into specific situations — very small apartments, extremely light sleepers, or users comparing to the absolute silence of a traditional key.
The Brushless Motor Difference
The Nuki Smart Lock 4.0 introduced a brushless motor, replacing the brushed motor used in earlier generations. The difference is dramatic and frequently noted in reviews from users who upgraded.
Brushed motors produce a higher-pitched whirring sound with noticeable vibration. Users of the Nuki 3.0 and earlier often described the sound as a "mechanical buzz" — not extremely loud, but clearly audible from the next room. The brushless motor in the 4.0 produces a lower, softer tone with significantly less vibration. Multiple upgraders describe it as going from "clearly hearable" to "barely noticeable."
In practical terms, the 4th generation motor is approximately 40% quieter based on user reports. Several technically-minded reviewers with decibel meters report readings of 38-42 dB during operation, roughly equivalent to a quiet library or a refrigerator hum. The lock cycle (full lock or unlock motion) takes about 1.5-2 seconds, so the sound duration is very brief.
Apartment-Friendly?
This is the question most people really want answered, and the data is reassuring. Among the 82% who rate noise positively, apartment dwellers are well-represented. Reviews specifically mentioning apartments, flats, or shared walls overwhelmingly confirm that the lock won't disturb a sleeping partner or neighbors.
The critical test case — unlocking the front door late at night while someone sleeps in the bedroom — gets consistently positive feedback for the 4.0 model. Users describe a soft click followed by a brief low hum, similar to a quiet dishwasher starting. In a typical apartment where the bedroom is behind a closed door, the lock operation is inaudible from the bedroom.
The one exception noted in reviews is very small studio apartments where the bed is in direct line with the front door and only a few meters away. In those setups, a light sleeper might notice the motor sound. However, even in these cases, reviewers generally classify it as "noticeable but not disruptive" — far less intrusive than the sound of a key turning, which involves metal scraping against metal.
How Nuki Compares
Tedee comes in at 3.9 out of 5 with 76% positive from 800 reviews. Tedee uses a brushless motor as well, but its smaller form factor means the motor is closer to the door surface, which some users say amplifies vibration slightly. The sound itself isn't louder, but the tactile feedback — the vibration you feel through the door — is more noticeable than Nuki's.
Yale scores 3.5 out of 5 with 64% positive from 1,500 reviews. Yale's motor noise varies significantly by model, but the general feedback is that Yale locks are perceptibly louder than Nuki. The Linus L2 (Yale's European model) draws the most noise complaints, with users describing a more mechanical, grinding sound.
LOQED lands at 3.6 out of 5 with 66% positive from 450 reviews. The LOQED Touch adds a unique noise element: the fingerprint reader and capacitive touch mechanism produce their own sounds — a beep on successful recognition and a click from the electronic latch release. These aren't loud, but they add to the overall noise profile in a way that Nuki's simpler motor-only operation doesn't.
Nuki's 4.1 puts it clearly ahead on noise. The brushless motor upgrade was a genuinely impactful engineering choice that reviewers notice and appreciate.
Night Use
The evidence from 1,800 reviews strongly supports comfortable nighttime use for the Nuki Smart Lock 4.0. The combination of a brushless motor, a brief 1.5-2 second operation cycle, and a soft operational tone makes it apartment-appropriate.
Users who use Auto Unlock — where the lock automatically opens as you approach — report the quietest experience because the motor starts before you physically interact with anything. You walk up, the lock has already turned, and you simply push the door open. The motor sound happens while you're still approaching, not while you're standing directly next to the lock with your ear close.
For Keypad users unlocking at night, the motor sound is preceded by a brief electronic beep (which can be disabled in settings). Several reviewers specifically mention disabling the Keypad confirmation sound for nighttime use while keeping the motor sound, which they find acceptable.
The only scenario where noise is a genuine concern is if you share a very small living space (under 25 square meters) and your partner is an extremely light sleeper. In that specific situation, 3-4% of reviewers suggest the sound is noticeable. For everyone else, the data says the noise is a non-issue.