4% OFF
£67.12
£69.74
Updated November 2026
Data from the official Shelly and X-Sense sites.
2026 verdict
Two smoke-only detectors, and the longer service life tilts it: the X-Sense Wi-Fi Smoke Alarm outlasts the Shelly Plus Smoke Alarm with a ten-year cell against five, and backs the unit with a five-year warranty rather than three.
Both connect straight to 2.4GHz Wi-Fi without a hub and send phone alerts, but the Shelly Plus Smoke Alarm is the one that joins a smart home properly, adding Google Home, Samsung SmartThings, Home Assistant and MQTT so a smoke event can trigger lights and routines. Neither detects carbon monoxide. Choose the X-Sense Wi-Fi Smoke Alarm for the longest battery and warranty in a simple room alarm, and the Shelly Plus Smoke Alarm when the alarm has to do something else in your automation system.
Works with
Connectivity
- Wi-Fi 2.4 GHz
- Bluetooth
vs
Winner
Price unavailable right now
Works with
Connectivity
- Wi-Fi 2.4 GHz
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The biggest differences
Where these two are furthest apart, and by how much.
- Battery Life2×X-Sense Wi-Fi Smoke Alarm10 years vs 5 years
- Warranty+67%X-Sense Wi-Fi Smoke Alarm5 years vs 3 years
| Feature | Shelly Plus Smoke Alarm | X-Sense Wi-Fi Smoke Alarm | Winner |
|---|---|---|---|
| Rating | 4.4 | 4.3 | Shelly Plus Smoke Alarm |
| Warranty | 3 years | 5 years | X-Sense Wi-Fi Smoke Alarm |
| Battery Life | 5 years | 10 years | X-Sense Wi-Fi Smoke Alarm |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi | Shelly Plus Smoke Alarm |
| Integrations | Google Home, Samsung SmartThings, Home Assistant | Home Assistant | Shelly Plus Smoke Alarm |
| Local Control | YES | Partially | Shelly Plus Smoke Alarm |
| Screen | NO | NO | Tie |
| Sensors | Smoke | Smoke | Tie |
| Alerts | Fire Alerts, Low Battery Alerts | Fire Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Built-in Light | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
What the differences mean
Automations and platform support
The Shelly Plus Smoke Alarm integrates with Google Home, Samsung SmartThings and Home Assistant, supports MQTT and can trigger scenes and other devices when smoke is detected. The X-Sense Wi-Fi Smoke Alarm has no such integrations and reports through its own app only, so it cannot turn on a light or trigger a routine.
Battery life
The X-Sense Wi-Fi Smoke Alarm is rated for ten years on its CR123A battery, against five on the Shelly Plus Smoke Alarm, so it asks for far fewer replacements over its life.
Warranty
The X-Sense Wi-Fi Smoke Alarm carries a five-year warranty, two years longer than the Shelly Plus Smoke Alarm's three, which suits a device meant to sit on a ceiling untouched.
Pairing path
Both join 2.4GHz Wi-Fi directly, but the Shelly Plus Smoke Alarm also uses Bluetooth for pairing, which can smooth the initial setup. The X-Sense Wi-Fi Smoke Alarm pairs over Wi-Fi alone and some owners report only a narrow window to finish it.
What they share
Neither detects carbon monoxide, neither has a screen, both have a built-in siren and a built-in light, and neither works with Alexa, Apple HomeKit or Matter. On the core job of a loud alarm and a phone alert, the two are much closer than the specs suggest.
Which one to buy if
- you want the alarm to trigger lights or routines
The Shelly Plus Smoke Alarm supports automations, MQTT, Google Home and SmartThings, while the X-Sense Wi-Fi Smoke Alarm cannot trigger anything.
- you want to install it and forget it for a decade
The X-Sense Wi-Fi Smoke Alarm is rated for ten years on one cell, twice the Shelly Plus Smoke Alarm's five.
- you run Home Assistant and want the alarm inside it
The Shelly Plus Smoke Alarm has a first-class Home Assistant and MQTT path and can drive scenes from a smoke event.
- you are fitting a rental or holiday home
The X-Sense Wi-Fi Smoke Alarm gives real-time phone alerts with no hub or automation setup and the longest warranty of the two.
- you want the simplest possible install
The X-Sense Wi-Fi Smoke Alarm pairs straight to Wi-Fi and needs nothing else, with no ecosystem to configure.
4% OFF
£67.12
£69.74
- + Rating: 4.4
- + Connectivity: 2.4 GHz WiFi, Bluetooth
- + Integrations: Google Home, Samsung SmartThings, Home Assistant
- - Warranty: 3 years vs 5 years
- - Battery Life: 5 years vs 10 years
Winner
Price unavailable right now
- + Warranty: 5 years
- + Battery Life: 10 years
- - Rating: 4.3 vs 4.4
- - Connectivity: 2.4 GHz WiFi vs 2.4 GHz WiFi, Bluetooth
What owners say
Both groups of owners wanted a connected smoke alarm without a hub, and both describe the setup as quick over 2.4GHz Wi-Fi. Shelly Plus Smoke Alarm owners are the more technical crowd, talking about wiring the alarm into Home Assistant, MQTT and Loxone so it drives notifications and scenes, and they like the loud siren and five-year battery. Their watch-outs are the absent CO sensor, no Apple HomeKit or Matter, no self-test, and a short pairing window, with a few reports of false alarms after months of use. X-Sense Wi-Fi Smoke Alarm owners bought for simplicity, praising real-time phone alerts on rental and holiday properties, the solid build and the replaceable battery, and they flag the same gaps: smoke only, no integrations, no automatic self-test, and an English-only app.
Frequently Asked Questions
Which is better, the Shelly Plus Smoke Alarm or the X-Sense Wi-Fi Smoke Alarm?
It depends on what the alarm has to do. The X-Sense Wi-Fi Smoke Alarm offers a ten-year battery and a five-year warranty in a simple, hub-free phone-alert alarm. The Shelly Plus Smoke Alarm gives up some battery span but joins Google Home, SmartThings and Home Assistant and can trigger automations, which the X-Sense cannot.
Do either of these detect carbon monoxide?
No. Both the Shelly Plus Smoke Alarm and the X-Sense Wi-Fi Smoke Alarm are smoke-only, with no CO sensor and no CO alerts, so a home with gas appliances still needs a separate carbon monoxide detector in each case.
Do these alarms need a hub?
Neither needs a hub. The Shelly Plus Smoke Alarm and the X-Sense Wi-Fi Smoke Alarm both connect directly over 2.4GHz Wi-Fi, with the Shelly also using Bluetooth for pairing. No bridge or base station is involved.
Which has the longer battery life?
The X-Sense Wi-Fi Smoke Alarm is rated for ten years on a replaceable CR123A cell, while the Shelly Plus Smoke Alarm is rated for five. Both alert you through the app when the battery needs changing.
Which alarm works with more smart home platforms?
The Shelly Plus Smoke Alarm. It supports Google Home, Samsung SmartThings and Home Assistant, along with MQTT for third-party systems like Loxone. The X-Sense Wi-Fi Smoke Alarm has no Alexa, Google Home, HomeKit, SmartThings or Matter support and lives only in its own app.
Who should buy the Shelly Plus Smoke Alarm?
Home Assistant, MQTT or Shelly households that want a smoke alarm to feed automations and notifications, and that value integration over battery span. Buyers who simply want a long-lived connected alarm with the least configuration are better served by the X-Sense Wi-Fi Smoke Alarm.
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