Smoke & CO Detectors · Head to head

Kidde Smart Smoke + Indoor Air Quality Alarm vs Shelly Plus Smoke Alarm

Full Smart Smoke & CO Detectors comparison in 2026

Data from Amazon and official Kidde and Shelly sites.
2026 verdict
Shelly Plus Smoke Alarm edges out Kidde Smart Smoke + Indoor Air Quality Alarm in 2026, led by price, rating, and connectivity. What pushes it ahead is price, rating, and connectivity, and integrations keep the advantage from looking narrow. The only strong reason to choose Kidde Smart Smoke + Indoor Air Quality Alarm is if warranty, sensors, and alerts are more important to you than the overall verdict. For most setups, Shelly Plus Smoke Alarm is the smarter buy.
vs
FeatureKidde Smart Smoke + Indoor Air Quality AlarmShelly Plus Smoke AlarmWinner
Price$98.74€39.95Shelly Plus Smoke Alarm
Rating3.44.4Shelly Plus Smoke Alarm
Warranty10 years3 yearsKidde Smart Smoke + Indoor Air Quality Alarm
Connectivity2.4 GHz WiFi2.4 GHz WiFi, BluetoothShelly Plus Smoke Alarm
IntegrationsGoogle Home, AlexaGoogle Home, Alexa, Samsung SmartThings, Home AssistantShelly Plus Smoke Alarm
SensorsSmoke, Humidity, Air QualitySmokeKidde Smart Smoke + Indoor Air Quality Alarm
AlertsFire Alerts, Low Battery Alerts, Air Quality AlertsFire Alerts, Low Battery AlertsKidde Smart Smoke + Indoor Air Quality Alarm
ScreenNONOTie
Built-in SirenYESYESTie
Built-in LightYESYESTie
Tests ItselfNONOTie
PathlightNONOTie

Frequently Asked Questions

Which is better overall: Kidde Smart Smoke + Indoor Air Quality Alarm 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 + Indoor Air Quality Alarm and Shelly Plus Smoke Alarm?

Price is one of the clearest differences: Kidde Smart Smoke + Indoor Air Quality Alarm lists $98.74, while Shelly Plus Smoke Alarm lists €39.95.

Which one looks better on price?

Kidde Smart Smoke + Indoor Air Quality Alarm is listed at $98.74, while Shelly Plus Smoke Alarm is listed at €39.95. Shelly Plus Smoke Alarm (better spec).

Who should buy Kidde Smart Smoke + Indoor Air Quality Alarm?

Choose Kidde Smart Smoke + Indoor Air Quality Alarm if your priority is warranty and sensors 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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