Winner
10% OFF
$359.99
$399.99
Updated November 2026
Data from the official Eufy and Nuki sites.
2026 verdict
Eufy FamiLock S3 Max wins on price, weather resistance, password features and its doorbell.
It undercuts Nuki's flagship, wears an IP65 rating, offers one-time, periodic and anti-peep passwords, and integrates a 2K HDR video doorbell, camera with local storage, rear viewing screen and palm-vein entry, a combination nothing else here matches. Nuki Smart Lock Ultra answers with a higher owner rating, a 2-year warranty versus 18 months, about 6 months of battery life versus 4, and Bluetooth plus Thread connectivity in Nuki's fastest, most premium European-cylinder retrofit. Both support Matter and every major platform. As a do-everything entrance system and on value, the Eufy FamiLock S3 Max takes the win; the Ultra remains the refined choice for Euro doors.
Connectivity
- Wi-Fi 2.4 GHz
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The biggest differences
Where these two are furthest apart, and by how much.
- Battery Life+50%Nuki Smart Lock Ultra6 months vs 4 months
- Warranty+33%Nuki Smart Lock Ultra2 years vs 1.5 years
| Feature | Eufy FamiLock S3 Max | Nuki Smart Lock Ultra | Winner |
|---|---|---|---|
| Rating | 4.3 | 4.5 | Nuki Smart Lock Ultra |
| Warranty | 1.5 years | 2 years | Nuki Smart Lock Ultra |
| Weather Resistance | IP65 | NO | Eufy FamiLock S3 Max |
| Battery Life | 4 months | 6 months | Nuki Smart Lock Ultra |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi, Bluetooth, Thread Protocol | Nuki Smart Lock Ultra |
| Lock/Unlock System | Remote, Passcode, Physical Key | Remote, Bluetooth, Passcode, Fingerprint, Physical Key | Nuki Smart Lock Ultra |
| One-Time Password | YES | Keypad required | Eufy FamiLock S3 Max |
| Periodic Password | YES | Keypad required | Eufy FamiLock S3 Max |
| Anti-peep Password | YES | NO | Eufy FamiLock S3 Max |
| Doorbell | YES | NO | Eufy FamiLock S3 Max |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
| Emergency Fingerprint | NO | NO | Tie |
Winner
10% OFF
$359.99
$399.99
- + Weather Resistance: IP65
- + One-Time Password: YES
- + Periodic Password: YES
- - Rating: 4.3 vs 4.5
- - Warranty: 1.5 years vs 2 years
- + Rating: 4.5
- + Warranty: 2 years
- + Battery Life: 6 months
- - Weather Resistance: NO vs IP65
- - One-Time Password: Keypad required vs YES
Frequently Asked Questions
Which is better overall: Eufy FamiLock S3 Max or Nuki Smart Lock Ultra?
Eufy FamiLock S3 Max wins with its lower price, IP65 build, integrated doorbell and camera, palm entry and guest passwords. Nuki Smart Lock Ultra counters with a higher rating, 2-year warranty, longer battery life and premium retrofit engineering.
What is the biggest difference between Eufy FamiLock S3 Max and Nuki Smart Lock Ultra?
Philosophy. The Eufy consolidates lock, doorbell, camera and peephole into one exterior unit for standard doors. The Ultra is a sleek interior motor over a European cylinder, fast and discreet, with keypad and fingerprint as accessories and no video features.
Which is better reviewed?
The Nuki Smart Lock Ultra, which owners call Nuki's best lock yet with only minor install quirks. The Eufy FamiLock S3 Max rates well too, though some owners hit Wi-Fi instability, Matter errors or support frustrations.
How do entry methods compare?
The Eufy FamiLock S3 Max: palm-vein recognition, keypad codes, app and key. The Nuki Smart Lock Ultra: phone, watch and geolocation auto-unlock out of the box, with keypad or fingerprint entry via optional accessories.
Who should buy Eufy FamiLock S3 Max?
Choose Eufy FamiLock S3 Max for one device that locks, watches and answers the door: palm unlock, 2K video without fees, rear screen and IP65 sealing, at the lower price.
Who should buy Nuki Smart Lock Ultra?
Choose Nuki Smart Lock Ultra for the finest Euro-cylinder retrofit: fastest motor, most compact body, built-in Wi-Fi, Matter and a 2-year warranty, with the better owner rating of the pair.
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