Brands AI mentions

#BrandMentioned in

Mentioned in on each AI engine, by brand
Mentioned in	ChatGPTChatGPT	Google AI ModeGoogle AI Mode
Kidde	96%	95%
First Alert	92%	86%
Google Nest	75%	55%
X-Sense	58%	68%
First Alert Onelink Safe & Sound	17%	18%

Questions and answers

Google AI ModeOct 26, 2026

The best smart smoke and carbon monoxide detector depends on your existing ecosystem, smart home platform, and whether you prefer an all-in-one safety hub or a straightforward, budget-friendly lifesaver.

Note: The highly regarded Google Nest Protect has been discontinued . While existing units are supported until their 10-year expiration dates, it is no longer the primary recommendation for a new smart home setup.

The Best Overall Choice. This is the direct, updated replacement for the Nest Protect ecosystem and is fully compatible with the Google Home app.

Features: Utilizes voice alerts that announce the specific room and type of danger.
Interconnect: If one alarm goes off, all compatible interconnected units sound an alert simultaneously throughout the home.
Power Options: Available in both battery-powered and hardwired versions.

Best for Alexa & Google Assistant Homes. An exceptionally well-reviewed and reliable option from a legacy safety brand that integrates smoothly into broad smart ecosystems.

Features: Delivers real-time mobile notifications and features a photoelectric sensor for smoldering fires alongside an electrochemical CO sensor.
Voice Alerts: Clearly announces "Fire!" or "Warning, Carbon Monoxide" instead of just chirping.
Hush Control: Allows you to silence nuisance alarms (like cooking smoke) directly from your phone if you are nearby.

Best Value Multi-Pack. Ideal if you need to outfit an entire house with smart detection without breaking the bank.

Features: Operates via a central SBS50 base station to link up to 50 devices together, pushing rapid alerts to the X-Sense app.
Power & Voice: Provides voice alerts and real-time status updates.
Trade-Off: It functions incredibly well within its own app, but does not offer deep native integration with Apple Home, Alexa, or Google Home.

Best Premium / Apple HomeKit Pick. A hardwired 3-in-1 device designed for users looking to maximize ceiling real estate.

Features: Combines premium smoke and CO protection with a built-in Amazon Alexa speaker and a customizable nightlight.
Audio: Supports AirPlay 2, allowing you to stream music or podcasts across rooms using 360-degree high-end audio.
Apple Integration: Features solid Apple HomeKit support.[2][3][4][5][6]

Key Factors to Consider Before Buying

Hardwired vs. Battery: Hardwired units (AC) connect directly to your home's electrical grid and use a battery backup for power outages. Battery-powered units are easier to install anywhere but require monitoring, though smart models will ping your phone before the 2 AM low-battery chirps begin.[1]
Interconnectivity: Ensure your chosen model supports "interconnect" features. If a fire starts in the basement, you want the alarm in your upstairs bedroom to go off immediately.[1][2][3]
Ecosystem Alignment: If your home relies heavily on Apple HomeKit, look toward the Onelink series . For general Google Home/Google Assistant builds, the First Alert SC5 or Kidde units offer the smoothest experience.[2][3]

To help narrow down the selection, let me know:

Are your current detectors hardwired into the ceiling, or are they battery-powered?
What smart home ecosystem do you use most frequently (Apple Home, Google Home, Alexa, or just a standalone app)?
How many detectors do you need to replace?

Sources cited in this answer4

ChatGPTOct 26, 2026

Best smart smoke and carbon monoxide detectors in 2026

My top pick is the First Alert SC5 Smart Smoke & Carbon Monoxide Alarm. It combines smoke and CO detection with Wi-Fi phone alerts, voice warnings, and interconnected alarms. It is also the successor to the long-popular Google Nest Protect, which has been discontinued.

The best alternative depends on whether you want Google Home compatibility, Ring integration, or an affordable way to get alerts when you're away from home.

Top picks

(Best overall)

First Alert SC5 Smart Smoke & CO Alarm

$120–$130

Approximate US price; varies by retailer and version.

Wi-Fi alerts to your phone when smoke or CO is detected.
Voice warnings and interconnected alarms.
Available in battery-powered and hardwired versions.
Best for a household wanting modern smart features without a separate security system.

www.reviewed.com www.reviewed.com whatsmarthome.com

Shop at First Alert

(Best for Ring users)

Kidde AA Battery-Powered Smart Smoke and CO Detector, Ring A…

$69.97

The Home Depot listing; battery-powered.

Sends smoke, CO, and low-battery notifications through the Ring app.
Wireless interconnection with compatible alarms.
A good fit if you already use Ring and want to avoid buying a different smart-home ecosystem.

themisreviews.com

Shop at The Home Depot

(Best hardwired alternative)

Kidde Smart Hardwired Smoke and Carbon Monoxide Detector wit…

$74.97

Hardwired with AA battery backup.

Smart notifications through the Kidde app.
Voice alerts and interconnection features.
Worth considering when replacing an existing hardwired combination alarm.

Shop at The Home Depot

Nest Labs S3000BWES Protect Battery-Powered Smoke & Carbon M…

$149.99

Legacy option; check availability and support.

Known for spoken alerts that identify the type and location of danger.
Still appears at some retailers, but it is discontinued.
I'd generally choose the newer First Alert SC5 for a new installation rather than invest in an older model.

www.reviewed.com www.reviewed.com whatsmarthome.com

Check retailer listing

Which one should you buy?

If your priority is…	My recommendation
Best all-around smart protection	First Alert SC5
Existing Ring security system	Kidde Smart with Ring
Replacing a hardwired alarm	First Alert SC5 Hardwired or Kidde 30CUAR-W
Keeping an existing Nest Protect	Continue using it if it's within its service life and functioning properly

Three features I would not compromise on

Certified safety: Look for UL-listed smoke and CO detection. Don't choose a device based on app features or online reviews alone. Consumer Reports warns that unverified detectors can be dangerously unreliable.
Interconnected alarms: When one alarm detects danger, compatible alarms throughout the house should sound.
Reliable alerts: Phone notifications are useful when you're away, but the detector must sound its local alarm even if Wi-Fi or internet service fails.

Also, check whether you need a hardwired or battery-powered model before ordering. Follow the manufacturer's replacement schedule and installation instructions.

Let me narrow it down to the best model for your home

1. What type of alarms do you currently have?

Hardwired into the ceiling

Battery-powered

Not sure

2. Which smart-home system do you use?

Google Home

Ring

Apple Home / HomeKit

None, or no preference

3. What's most important?

Best overall protection

Phone alerts while I'm away

Best value for money

All alarms sounding together throughout the home

[Find my best match]

Sources cited in this answer9

Google AI ModeOct 16, 2026
1Google Home
2Kidde
3First Alert
4Google Nest
Top-rated smart smoke and carbon monoxide (CO) alarms balance reliable life-saving sensor tech with convenient smartphone alerts and ecosystem integration.

Details: Recognized as a top pick by The New York Times - Wirecutter , this hardwired unit integrates dual detection with seamless app connectivity, location naming, and smart assistant compatibility (Alexa and Google Home). It allows you to silence false alarms directly from your phone and features whole-home activation if synced with compatible hardwired units.

Price: Around $75

Actionability: View product specs and options on the Kidde Smart Detectors Page.

Details: Serving as a strong alternative or runner-up in smart testing, this hardwired model integrates smoothly with Google Home and features clear voice setup alerts, fail-safe hushes, and robust dual-hazard detection.

Price: Around $129

Details: A long-standing favorite in the smart home space, it features a split-spectrum sensor to detect fast and slow fires, a friendly human voice warning before the siren blares, a self-test feature, and an integrated pathlight. It ties directly into the Google Home ecosystem.

Price: Around $119

If you'd like to narrow down the choice, let me know:

Do you need hardwired or battery-operated units?

What smart home ecosystem (Apple HomeKit, Google Home, Alexa, or Ring) do you primarily use?

Sources cited in this answer2
consumerreports.orgBest Smoke and Carbon Monoxide Detectors of 2026 - Consumer Reports
nytimes.comThe 3 Best Smart Smoke Alarms of 2026 | Reviews by Wirecutter
ChatGPTOct 16, 2026
1First Alert
2Google Nest
3X-Sense
My top recommendation is the First Alert SC5 Smart Smoke & Carbon Monoxide Alarm. It’s a strong modern alternative to the Google Nest Protect, with smartphone alerts, voice warnings, and interconnected alarms for whole-home protection.

I checked current product listings and 2026 reviews. The key is to choose an alarm that offers reliable certified fire and CO detection first, with smart features as an added benefit.

My top picks

(Best overall)

First Alert SC5 Hardwire Smart 2-in-1 Smoke and CO Alarm wit…

4.6/5 (20 reviews)

$128.85

Walmart · Hardwired with battery backup

Wi-Fi smartphone alerts for smoke and CO

Voice alerts and interconnected alarms

Designed to replace compatible Nest Protect installations

My pick if you want a full-featured smart alarm.

View product and current price

(Best value)

Kidde Smart Hardwired Smoke and Carbon Monoxide Detector wit…

4.8/5 (53 reviews)

$74.97

The Home Depot · Hardwired with AA backup

Smart notifications to your phone

Voice alerts and wireless interconnection

A lower-cost option from an established alarm manufacturer

View product and current price

(Best for multi-alarm setups)

XP0A-MR Interconnected Smart Smoke and CO Alarm with Voice A…

4.9/5 (179 reviews)

$139.99

X-Sense · Three alarms and base station

Wi-Fi app alerts and voice warnings

Interconnected alarms for broader home coverage

Useful if you need to cover multiple rooms

View product and current price

What I'd check before buying

Hardwired or battery-powered: Choose the type that matches your home's wiring and local requirements.

Smart-home compatibility: Verify support for your existing ecosystem, such as Google Home, Alexa, or Ring.

Certification and expiration: Confirm the exact model's UL or other applicable safety certification and its replacement date.

Ongoing costs: Check whether app alerts require a subscription.

Consumer Reports' 2026 testing also emphasizes comparing actual detector performance rather than relying on smart features alone.

One question so I can narrow this down: Which setup do you have?

1. Alarm power

Hardwired alarms already installed

Battery-powered only

Either / not sure

2. Smart-home system

Google Home

Amazon Alexa

Ring

Apple Home

No smart-home system

[Find my best match]
Sources cited in this answer7
lightsandkits.comBest Smart Smoke and CO Detectors 2026 (Post-Nest Era) | Lights & Kits
lightsandkits.comBest Smart Smoke and CO Detectors 2026 (Post-Nest Era) | Lights & Kits
consumerreports.orgBest Smoke and Carbon Monoxide Detectors of 2026 - Consumer Reports
walmart.comFirst Alert, Smoke and CO Alarm, 2-in-1 Hardwired with Voice Alerts - Walmart.com
homedepot.comShop at The Home Depot
x-sense.comView product and current price