Smoke & CO Detectors · Head to head

Kidde Smart Smoke Alarm (P4010ACS-WF) vs Shelly Plus Smoke Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Data from Amazon and official Kidde and Shelly sites.
2026 verdict
Between Shelly Plus Smoke Alarm and Kidde Smart Smoke Alarm (P4010ACS-WF), Shelly Plus Smoke Alarm is the better overall pick in 2026, leading on price, rating, and connectivity. It separates itself most clearly on price, rating, and connectivity, while still looking better on integrations and Built-in light. Choose Kidde Smart Smoke Alarm (P4010ACS-WF) only if warranty and battery life matter more to you than the broader advantage from Shelly Plus Smoke Alarm. That is why the final call still favors Shelly Plus Smoke Alarm.
vs
FeatureKidde Smart Smoke Alarm (P4010ACS-WF)Shelly Plus Smoke AlarmWinner
Price$40.79€39.95Shelly Plus Smoke Alarm
Rating3.34.4Shelly Plus Smoke Alarm
Warranty10 years3 yearsKidde Smart Smoke Alarm (P4010ACS-WF)
Battery Life10 years5 yearsKidde Smart Smoke Alarm (P4010ACS-WF)
Connectivity2.4 GHz WiFi2.4 GHz WiFi, BluetoothShelly Plus Smoke Alarm
IntegrationsGoogle Home, AlexaGoogle Home, Alexa, Samsung SmartThings, Home AssistantShelly Plus Smoke Alarm
Built-in LightNOYESShelly Plus Smoke Alarm
ScreenNONOTie
SensorsSmokeSmokeTie
AlertsFire Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
Tests ItselfNONOTie

Frequently Asked Questions

Which is better overall: Kidde Smart Smoke Alarm (P4010ACS-WF) or Shelly Plus Smoke Alarm?

Shelly Plus Smoke Alarm has the stronger overall profile in this comparison, especially for price, rating, and connectivity.

What is the biggest difference between Kidde Smart Smoke Alarm (P4010ACS-WF) and Shelly Plus Smoke Alarm?

Price is one of the clearest differences: Kidde Smart Smoke Alarm (P4010ACS-WF) lists $40.79, while Shelly Plus Smoke Alarm lists €39.95.

Which one looks better on price?

Kidde Smart Smoke Alarm (P4010ACS-WF) is listed at $40.79, while Shelly Plus Smoke Alarm is listed at €39.95. Shelly Plus Smoke Alarm (better spec).

Who should buy Kidde Smart Smoke Alarm (P4010ACS-WF)?

Choose Kidde Smart Smoke Alarm (P4010ACS-WF) if your priority is warranty and battery life and that matters more than price.

Who should buy Shelly Plus Smoke Alarm?

Choose Shelly Plus Smoke Alarm if your priority is price and rating and that matters more than warranty.

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