Eufy vs Nuki Smart Lock

Eufy Smart Lock Overview

Eufy's smart lock range, including the C220 model, is built around a simple premise: no cloud, no subscriptions, no data leaving your home. The lock communicates solely via Bluetooth to the Eufy Security app on your phone. There is no Wi-Fi bridge or hub required, and no support for Alexa, Google Assistant, or Apple HomeKit. This makes it one of the most private smart locks on the market.

Installation is genuinely tool-free. The lock replaces the interior thumb-turn of your existing deadbolt with a motorised unit that twists the same mechanism. Owners on Amazon report a 10-minute setup process with no drilling or wiring. The lock uses four AA batteries, which Eufy claims last 8-12 months under normal use. A low-battery alert sounds before the lock stops working.

The main drawback is the lack of remote access. You cannot check if the door is locked from work, let in a guest while away, or integrate the lock with a smart speaker. The app allows you to create passcodes for family members, but those codes are stored locally on the lock itself. If you lose your phone, you can still use the physical key.

Nuki Smart Lock Overview

Nuki is the European market leader for retrofit smart locks, and the 4th Gen model is its most polished version. Unlike Eufy, Nuki is built for connectivity. The lock connects via Bluetooth to your phone, but the included Nuki Bridge adds Wi-Fi so you can control the lock from anywhere. The lock also supports Matter, making it compatible with Apple Home, Google Home, and Amazon Alexa.

Installation takes slightly longer than Eufy because you need to attach an adhesive plate to the door. The lock itself is larger and heavier, housing a rechargeable Li-ion battery that lasts 6-9 months. The battery is removable and charges via USB-C. Owners on Amazon praise the smooth motor operation and the ability to set up auto-unlock when your phone approaches.

Nuki's app is more feature-rich than Eufy's. You can set time-limited access codes for guests, view a log of all lock activity, and link the lock to your smart home routines. The main trade-off is privacy: Nuki relies on cloud servers for remote access, and the lock communicates with Nuki's servers when you use voice commands or the app away from home.

Key Differences Between Eufy and Nuki

The most important difference is connectivity. Eufy is a local-only lock that never sends data to the cloud. Nuki is a cloud-connected lock that enables remote access and voice control. This affects every aspect of how you use the lock.

Battery life is another differentiator. Eufy's AA batteries last longer and are easier to replace. Nuki's rechargeable battery is more eco-friendly but requires you to remember to charge it every 6-9 months. If the battery dies, Nuki has a 9V emergency contact on the exterior, while Eufy has a physical key override.

Price is also a factor. Eufy's C220 is typically cheaper than Nuki's 4th Gen, especially when you factor in that Nuki requires the Bridge for full functionality. However, Nuki often includes the Bridge in the box, so the upfront cost is higher but the feature set is broader.

What to Check Before Buying a Smart Lock

Before choosing between Eufy and Nuki, check your door's preparation. Both locks require a standard single-cylinder deadbolt with a thumb turn on the inside. They will not work with mortice locks, rim locks, or multi-point locking systems.

Check your door thickness. Most smart locks work on doors between 35mm and 60mm thick. If your door is thinner or thicker, you may need an adapter plate. Also check the backset distance from the edge of the door to the centre of the lock hole. The standard is 60mm or 70mm.

Consider your smart home ecosystem. If you use Apple Home, Google Home, or Alexa, Nuki is the only choice of the two. If you have no smart speakers and do not need remote access, Eufy's simplicity and privacy are strong advantages.

Mistakes to Avoid When Buying a Smart Lock

Do not assume all smart locks fit all doors. Eufy and Nuki are retrofit locks that replace the interior thumb turn only. They do not replace the entire lock mechanism. If your deadbolt is already faulty, replace it before adding the smart lock.

Do not ignore battery backup. Both locks have low-battery warnings, but if you ignore them, you could be locked out. Eufy has a physical key override; Nuki has a 9V battery contact on the exterior. Keep a 9V battery in your car or bag if you choose Nuki.

Do not buy a lock that requires a subscription. Neither Eufy nor Nuki charges monthly fees for basic features. Some smart locks from other brands require a subscription for remote access or activity logs. Avoid those.