Smartphone instead of key
This is how smart door locks protect your home
November 13, 2025 – 07:15Reading time: 3 minutes
Smart door locks combine convenience and security through digital access control. The transition from keys to digital solutions is easy. Find out which models have been particularly proven.
The dark winter months bring not only an increased risk of theft, but also a desire for more comfort in your own home. Smart door locks combine modern technology with proven security and make life easier.
Instead of using a heavy keychain, a smartphone is enough to open the front door. Digital access codes also make it possible to grant temporary access to guests or service providers without handing over physical keys. t-online explains the most important functions and presents three recommended models.
Modern households benefit from the flexibility of smart door locks. Smartphones are universal keys that cannot be lost and can be inherited digitally if necessary. Automatic locking and unlocking when leaving or entering the house significantly increases comfort.
At the same time, the system offers advanced security functions: an activity log shows who entered the house and when, as well as real-time notifications informing each time the door opens. Integration into smart home systems enables comprehensive automation and centralized control.
Smart door locks range from simple Bluetooth solutions to fully integrated smart home systems. The following three models cover different needs and budgets.
Nuki Smart Lock Go turns your smartphone into a digital lock and offers the perfect introduction to a smart home. DIY installation takes just a few minutes and is done without replacing the cylinder or drilling the inside of the door.
The system supports Bluetooth, WiFi, and Matter standards for maximum compatibility. Digital keys can be shared and all inputs and outputs can be monitored via the Nuki app. Remote access via WiFi is possible for a one-time fee.
Optional extensions such as a weatherproof keypad allow access via individual codes, while door sensors monitor status and warn if the door is open. The four AA batteries are easy to replace.
Integration with Amazon Alexa, Google Home, and Apple HomeKit enables voice control and intelligent automation. For less than 150 euros, beginners receive a complete smart lock system with extensive expansion options.
The Yale Linus L2 offers technological improvements over the first generation: smaller, more powerful, quieter and twice as fast. Rechargeable battery ensures long-term operation without frequent battery replacement.
The auto unlock feature automatically unlocks the door when you approach and locks it at a certain time or when you exit. The included Yale Dot allows access with a simple tap on your smartphone.
Time-based locking at bedtime and automatic unlocking in the morning make daily routines even more convenient. Activity feeds and smart notifications keep you up to date on all door openings.
