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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

Updated September 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 integrations.
Shelly Plus Smoke Alarm
Winner
Shelly Plus Smoke Alarm
€39.95€53.4325% OFF
Buy on Amazon GermanyCheck price
It separates itself most clearly on price, rating, and integrations, while still looking better on 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.
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FeatureKidde Smart Smoke Alarm (P4010ACS-WF)Shelly Plus Smoke AlarmWinner
Price$40.79€39.95Shelly Plus Smoke Alarm
Rating3.24.4Shelly Plus Smoke Alarm
Warranty10 years3 yearsKidde Smart Smoke Alarm (P4010ACS-WF)
Battery Life10 years5 yearsKidde Smart Smoke Alarm (P4010ACS-WF)
IntegrationsGoogle Home, Alexa, Home AssistantGoogle Home, Alexa, Samsung SmartThings, Home AssistantShelly Plus Smoke Alarm
Built-in LightNOYESShelly Plus Smoke Alarm
Connectivity2.4 GHz WiFi2.4 GHz WiFi, BluetoothTie
ScreenNONOTie
SensorsSmokeSmokeTie
AlertsFire Alerts, Low Battery AlertsFire Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
PathlightNONOTie

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 integrations.

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.

Full comparison table

Compare all 24 Smoke & CO Detectors side by side

You are looking at two of them. The full table lines up all Smoke & CO Detectors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.

  • 24 Smoke & CO Detectors
  • 44 specs compared
  • 41 filters
Open the full comparison
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