Heiman Smart CO Alarm vs X-Sense Wi-Fi Smoke Alarm

Different hazard, same battery-powered simplicity: the Heiman Smart CO Alarm wins this smoke-vs-CO comparison on the strength of its far wider integrations, reaching Google Home, Alexa, Apple HomeKit, Samsung SmartThings and Home Assistant through Matter over Thread, while the X-Sense Wi-Fi Smoke Alarm has no smart home platform support at all beyond its own app. The X-Sense Wi-Fi Smoke Alarm holds its ground with a higher owner rating, and it is worth remembering the two do not detect the same hazard: the X-Sense unit is smoke-only, while the Heiman alarm only senses carbon monoxide, so this is really a comparison of connectivity and ecosystem reach rather than which alarm keeps you safer. Both run on a single replaceable battery, include a built-in siren and light, and skip self-testing and steam-check filtering entirely. Smart-home households that want CO alerts routed into Google, Alexa or Apple Home should pick the Heiman Smart CO Alarm, while anyone who just wants a simple WiFi-connected smoke alarm with phone alerts and no border router to manage should choose the X-Sense Wi-Fi Smoke Alarm.