Google Nest Protect Smoke + CO Alarm

Quick verdict

The Nest Protect is the most polished smart smoke alarm you can buy. Voice alerts, wireless interconnect, and the pathlight feature are genuinely useful. But it is deeply locked into Google's cloud with poor Home Assistant support and no local API. If you are a Google Home household and do not mind cloud dependency, it is excellent. Local-control advocates should look at the First Alert ZCOMBO-G instead.

Standout: Wireless interconnect with voice alerts that tell you the type and location of danger across every Nest Protect in your home.

Last checked: 2026-03-25

Compatibility snapshot

Why it stands out

• excellent build quality with voice alerts that tell you what the danger is and where
• multiple Nest Protects interconnect wirelessly so all alarms sound when one detects smoke or CO
• pathlight feature illuminates hallways when it detects motion at night

Reasons to hesitate

• fully cloud-dependent for all smart features and notifications
• Home Assistant integration is limited and uses the cloud API with restricted access
• premium price for a smoke alarm, significantly more expensive than alternatives

Best for

• Google Home households that want a premium interconnected smoke and CO alarm system
• buyers who prioritize industrial design and voice alerts over local control

Avoid if

• local control and privacy are priorities for you
• you want deep Home Assistant integration for safety automations

Privacy and local-control notes

Highly cloud-dependent for smart features. Nest collects usage data and sends it to Google servers. The device functions as a basic smoke alarm offline, but all smart notifications and integrations require cloud connectivity.

Home Assistant support: supported · integration path: Nest (cloud API).

Buying reality check

Price notes: Premium pricing. Available in battery and wired models. No subscription required but locked into the Google ecosystem.

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