Heiman Matter Smoke Detector S1-M vs X-Sense Wi-Fi Carbon Monoxide Alarm

Data from Amazon and official Heiman and X-Sense sites.

2026 verdict

Heiman Matter Smoke Detector S1-M beats X-Sense Wi-Fi Carbon Monoxide Alarm in 2026, with its clearest edge on integrations, tests itself, and steam check.

Winner

Heiman Matter Smoke Detector S1-M

$39.99

Buy on Amazon USA

It has the clearer edge on integrations, tests itself, and steam check, and it stays ahead on its broader overall balance. X-Sense Wi-Fi Carbon Monoxide Alarm is still relevant if you care most about rating, screen, and Built-in light, but Heiman Matter Smoke Detector S1-M is the stronger recommendation overall. For the average buyer, Heiman Matter Smoke Detector S1-M is the safer choice.

Winner

Heiman

Heiman Matter Smoke Detector S1-M

$39.99

Buy on Amazon USA

X-Sense

X-Sense Wi-Fi Carbon Monoxide Alarm

Price unavailable right now

Buy on Amazon UK

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Feature	Heiman Matter Smoke Detector S1-M	X-Sense Wi-Fi Carbon Monoxide Alarm	Winner
Rating	3.6	4.6	X-Sense Wi-Fi Carbon Monoxide Alarm
Integrations	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Home Assistant	Heiman Matter Smoke Detector S1-M
Screen	NO	YES	X-Sense Wi-Fi Carbon Monoxide Alarm
Built-in Light	NO	YES	X-Sense Wi-Fi Carbon Monoxide Alarm
Tests Itself	YES	NO	Heiman Matter Smoke Detector S1-M
Steam Check	YES	NO	Heiman Matter Smoke Detector S1-M
Connectivity	Thread Protocol	2.4 GHz WiFi	Tie
Sensors	Smoke	CO	Tie
Alerts	Fire Alerts, Low Battery Alerts	CO Alerts, Low Battery Alerts	Tie
Built-in Siren	YES	YES	Tie
Pathlight	NO	NO	Tie

Winner

Heiman

Heiman Matter Smoke Detector S1-M

$39.99

Buy on Amazon USA

+ Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
+ Tests Itself: YES
+ Steam Check: YES
- Rating: 3.6 vs 4.6
- Screen: NO vs YES

X-Sense

X-Sense Wi-Fi Carbon Monoxide Alarm

Price unavailable right now

Buy on Amazon UK

+ Rating: 4.6
+ Screen: YES
+ Built-in Light: YES
- Integrations: Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
- Tests Itself: NO vs YES

Frequently Asked Questions

Which is better overall: Heiman Matter Smoke Detector S1-M or X-Sense Wi-Fi Carbon Monoxide Alarm?

Heiman Matter Smoke Detector S1-M has the stronger overall profile in this comparison, especially for integrations, tests itself, and steam check.

What is the biggest difference between Heiman Matter Smoke Detector S1-M and X-Sense Wi-Fi Carbon Monoxide Alarm?

Rating is one of the clearest differences: Heiman Matter Smoke Detector S1-M lists 3.6, while X-Sense Wi-Fi Carbon Monoxide Alarm lists 4.6.

Who should buy Heiman Matter Smoke Detector S1-M?

Choose Heiman Matter Smoke Detector S1-M if your priority is integrations and tests itself and that matters more than rating.

Who should buy X-Sense Wi-Fi Carbon Monoxide Alarm?

Choose X-Sense Wi-Fi Carbon Monoxide Alarm if your priority is rating and screen and that matters more than integrations.

Full comparison table

Compare all 19 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.