Carbon monoxide alarms have been slow to get the smart home treatment, and Heiman is among the first to bring one to market with Matter over Thread. It works with Home Assistant, Apple Home, Google Home, and Alexa, all locally. The built-in alarm sounds regardless of your network status. If you have been waiting for a CO alarm that integrates into your smart home without cloud dependency, this is one of the first viable options.
Standout: Among the first Matter over Thread carbon monoxide alarms available, with cross-platform smart home support.
Notes last checked May 31, 2026.
Compatibility snapshot
Home AssistantgoodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally.
Apple HomegoodWell supported, with only minor gaps.
Google HomegoodWell supported, with only minor gaps.
AlexagoodWell supported, with only minor gaps.
Works offlineyes
Setupeasy
Extra hub neededno
Powerbattery
Local control facts
Home Assistant: matter integration, Local Push (home-assistant.io, checked Sep 10, 2026)
Why it stands out
one of the first Matter-native CO alarms on the market
works across all major smart home platforms via Matter
standalone alarm function works independently of your network. Safety first
Reasons to hesitate
requires a Thread border router for smart home integration
CO alarm support in Matter controllers is still relatively new
less brand recognition than traditional safety brands like First Alert or Kidde
Best for
users who want a cross-platform smart CO alarm with local-only operation
early Matter adopters building a Thread-based safety network
Avoid if
you want a CO alarm from a legacy safety brand with decades of track record
Matter CO alarm support on your preferred platform is not yet mature
Privacy and local-control notes
Fully local Matter over Thread device. No cloud account or internet connection required.
Home Assistant support: supported · integration path: Matter.
Buying reality check
Price notes: Mid-range pricing competitive with other smart CO detectors, with the added benefit of Matter cross-platform support.
Best smart radon and CO detectors for Home Assistant
Radon sensors that report into Home Assistant locally: Airthings Wave over BLE, RadonEye RD200 via ESPHome, EcoQube. Plus Heiman and First Alert CO alarms.
A practical guide to building a local-first smart home security system with Home Assistant, focusing on real hardware choices and avoiding cloud dependencies.
