Yes, if WiFi is down, your smart smoke detector will still detect smoke and sound the local alarm, but you will lose smart features like remote smartphone notifications and app-based alerts. The ability to communicate with other connected devices in your home or receive updates often depends on the specific model’s design; some use WiFi, while others rely on a separate radio frequency (RF) network.
Anka summarizes what typically happens when WiFi is down:
Local Alarm Functionality:
The main detection and alarm functions of your smart smoke detector will continue to function as a traditional smoke alarm.
No Remote Alarm:
When WiFi is down, you will not receive smartphone notifications or alerts from the app.
Interconnection May Still Work:
If your smart detectors are connected to each other, they can still communicate with each other using a separate wireless RF network, ensuring all alarms sound, even without WiFi.
Loss of “Smart” Features:
Features that require cloud connectivity, such as status monitoring in the app, remote muting, or integration with other smart home devices, will be unavailable.
Things to consider to ensure continued security, according to anka security:
Check your model’s capabilities:
Understand whether your specific smart smoke detector relies on WiFi for core interconnection or uses a separate RF network.
Consider a dual-path system:
For maximum reliability, you can choose a system that uses both a WiFi connection and a dedicated cellular network.
Test regularly:
Regardless of the status of your internet connection, continually test your alarms to confirm they are working properly.

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