Updated November 2026
Data from the 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 and local control 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.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Winner
7% OFF
£64.82
£69.74
Works with
Connectivity
- Wi-Fi 2.4 GHz
- Bluetooth
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| Feature | Kidde Smart Smoke + Indoor Air Quality Alarm | Shelly Plus Smoke Alarm | Winner |
|---|---|---|---|
| Price | $113.84 | £64.82 | Shelly Plus Smoke Alarm |
| Rating | 3.4 | 4.4 | Shelly Plus Smoke Alarm |
| Warranty | 10 years | 3 years | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi, Bluetooth | Shelly Plus Smoke Alarm |
| Integrations | Google Home, Home Assistant | Google Home, Samsung SmartThings, Home Assistant | Shelly Plus Smoke Alarm |
| Sensors | Smoke, Humidity, Air Quality | Smoke | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Alerts | Fire Alerts, Low Battery Alerts, Air Quality Alerts | Fire Alerts, Low Battery Alerts | Kidde Smart Smoke + Indoor Air Quality Alarm |
| Local Control | Partially | YES | Shelly Plus Smoke Alarm |
| Screen | NO | NO | Tie |
| Built-in Siren | YES | YES | Tie |
| Built-in Light | YES | YES | Tie |
| Pathlight | NO | NO | Tie |
$113.84
- + Warranty: 10 years
- + Sensors: Smoke, Humidity, Air Quality
- + Alerts: Fire Alerts, Low Battery Alerts, Air Quality Alerts
- - Price: $113.84 vs £64.82
- - Rating: 3.4 vs 4.4
Winner
7% OFF
£64.82
£69.74
- + Price: £64.82
- + Rating: 4.4
- + Connectivity: 2.4 GHz WiFi, Bluetooth
- - Warranty: 3 years vs 10 years
- - Sensors: Smoke vs Smoke, Humidity, Air Quality
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 $113.84, while Shelly Plus Smoke Alarm lists £64.82.
Which one looks better on price?
Kidde Smart Smoke + Indoor Air Quality Alarm is listed at $113.84, while Shelly Plus Smoke Alarm is listed at £64.82. 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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- 28 Smoke & CO Detectors
- 45 specs compared
- 42 filters
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- Buttons
BLU Button Tough 1 ZB
- Buttons
BLU RC Button 4 ZB
- Cameras
Camera
- Displays
Wall Display X1i
- Displays
Wall Display XL
- Displays
Wall Display
- Door & Window Sensors
BLU Door/Window Outdoor ZB
- Door & Window Sensors
BLU Door/Window ZB
- Energy Monitors
3EM-63W Gen3
- Energy Monitors
EM Gen3
- Energy Monitors
EM Gen4
- Energy Monitors
EM Mini Gen4
- Energy Monitors
Pro 3EM 3CT63
- Energy Monitors
Pro 3EM-400
- Energy Monitors
Pro 3EM v2
- Energy Monitors
Pro EM-50
- Gas Detectors
GAS (CNG)
- Gas Detectors
GAS (LPG)
- LED Bulbs
Multicolor Bulb E27 Gen3
- Motion Sensors
BLU Motion ZB