Smart carbon monoxide detectors with phone alerts add an important layer of protection by sending warnings to your device when you’re away from home. That makes them especially useful for busy households, rentals, and anyone who wants faster awareness of a potential CO issue.
Below, we’ve narrowed the options to ten strong picks with a focus on alert reliability, power backup, smart-home support, and easy installation.
Best 10 Smart Carbon Monoxide Detectors with Phone Alerts Picks for 2026
Plug-In Smart CO Alert
Kidde Wi‑Fi Detector with Battery Backup
- Real-time app notifications with no subscription
- Plug-in design includes AA battery backup
- 2.4 GHz Wi-Fi with Alexa and Google Home support
Best For: homeowners and renters who want easy plug-in CO monitoring
2-in-1 Smart Monitor
Kidde CO and Indoor Air Quality Alert
- Combines CO detection with indoor air quality monitoring
- Voice and app alerts for hazard type
- Tracks TVOCs and humidity in one plug-in unit
Best For: buyers who want CO alerts plus extra indoor air monitoring
Battery Smart Alarm
First Alert CO and Smoke with Phone Alerts
- Battery-powered with phone alerts through the First Alert app
- Voice alerts name the danger type and location
- Low-battery notifications help avoid chirps
Best For: apartments and rentals needing easy-install smart protection
Plug-In Basic Protection
Kidde CO Detector with Battery Backup
- Easy plug-in setup for a standard outlet
- 2-AA battery backup supports outages
- 85 dB alarm with Peak Level Memory
Best For: homes that want simple plug-in CO protection without smart alerts
Smart Phone Alerts Pick
- Sends real-time phone alerts over 2.4 GHz Wi-Fi
- Battery powered with an 85 dB alarm
- 10-year sensor and low-battery warning
Best For: buyers who want app-connected CO alerts and compact placement
Reliable Plug-In Backup
First Alert CO606 Plug-In Alarm
- Standard-outlet plug-in design with battery backup
- Electrochemical sensor and 85 dB alarm
- Simple test/silence button and end-of-life chirp
Best For: homeowners who want a straightforward plug-in CO alarm
Matter Thread CO Alarm
Matter CO Detector Battery Powered
- Matter over Thread works with major smart home platforms.
- Sends real-time phone alerts through a compatible hub.
- UL 2034 5th Edition certified with battery backup.
Best For: Connected homes that want compact CO monitoring with Matter-based alerts.
Hardwired Whole-Home Alarm
Hardwired Smart Smoke and CO Detector
- Combines smoke and CO detection in one hardwired unit.
- Sends mobile alerts and low-battery warnings through the app.
- Works with interconnected Kidde smart alarms for whole-home coverage.
Best For: Hardwired homes that want combined smoke and CO protection with app alerts.
Plug-In Air Quality Monitor
Smart Carbon Monoxide Monitor with IAQ
- Real-time Kidde app alerts with no subscription required.
- Monitors CO, indoor air quality, humidity, and TVOC.
- Plug-in design includes AA battery backup and rotating plug.
Best For: Tech-minded buyers who want CO alerts plus indoor air-quality tracking.
Plug-In Smart CO Alert – Kidde Wi‑Fi Detector with Battery Backup
If you want smart carbon monoxide detectors with phone alerts for everyday use, this Kidde plug-in model is built for simple setup and dependable notifications. It connects over 2.4 GHz Wi-Fi, sends real-time app alerts, and adds a loud 85 dB alarm for when you are home.
Best For: Homeowners and renters who want an easy plug-in CO detector with backup power and app alerts.
Pros:
- Real-time Kidde app notifications with no subscription required
- Plug-in design with AA battery backup for power outages
- Rotating plug fits vertical or horizontal outlets
- Works with Alexa-enabled devices and Google Home
Cons:
- Requires 2.4 GHz Wi-Fi
- Plug-in design may not suit locations without nearby outlets
This is a straightforward pick if you want app-based CO alerts without extra fees. The UL 2034, 5th Edition testing and 10-year limited warranty add reassurance for long-term use.
Hardwired Smart Alarm – First Alert Smoke & CO with Nest Compatibility
For buyers comparing smart carbon monoxide detectors with phone alerts, this First Alert hardwired alarm adds both smoke and CO monitoring in one unit. It sends notifications through the First Alert app and supports interconnectivity, so compatible alarms can sound together across the home.
Best For: Homes that want a hardwired smart alarm with phone alerts, interconnect support, and battery backup.
Pros:
- Sends smoke and CO alerts to your phone through the First Alert app
- Hardwired design with battery backup for power outages
- Interconnect feature sounds all compatible alarms when one activates
- Voice alerts identify the type and location of danger
Cons:
- Requires hardwired installation
- Smart features depend on app and compatible devices
This is a strong fit if you want a whole-home alarm setup rather than a single standalone detector. Precision Detection Technology and quick-connect installation round out the practical appeal.
2-in-1 Smart Monitor – Kidde CO and Indoor Air Quality Alert
If you want smart carbon monoxide detectors with phone alerts plus extra indoor monitoring, this Kidde model combines CO detection with indoor air quality tracking in one plug-in device. It sends voice and app alerts, and it also monitors TVOCs and humidity for a broader view of home air.
Best For: Shoppers who want one plug-in device for CO alerts and basic indoor air quality monitoring.
Pros:
- 2-in-1 design monitors carbon monoxide and indoor air quality
- Voice alarm announces the hazard type
- Compatible with Alexa, Google Home, iPhone, and Android
- Monitors TVOCs and humidity in addition to CO
Cons:
- Requires a standard outlet for plug-in installation
- Wi-Fi/app-based features may not be ideal for buyers wanting a simple standalone alarm
This is a useful pick if you want more than just CO monitoring from a single smart unit. The combo approach can help if you are also watching for common indoor air concerns from cleaning products and paint.
Battery Smart Alarm – First Alert CO and Smoke with Phone Alerts
This battery-powered First Alert option is aimed at buyers who want smart carbon monoxide detectors with phone alerts without relying on hardwired power. It sends smoke and CO notifications through the First Alert app, includes voice alerts, and adds low-battery notifications to help avoid late-night chirps.
Best For: Apartments, rentals, and rooms where a battery-powered smart smoke and CO alarm is easier to install.
Pros:
- Phone alerts for smoke and CO through the First Alert app
- Battery-powered design for flexible placement
- Voice alerts identify the type and location of danger
- Low-battery notifications help reduce surprise chirps
Cons:
- Does not include hardwired power
- Smart features depend on app connectivity and compatible devices
This model makes sense if you want easy placement and app notifications without electrical work. Precision Detection Technology and interconnect compatibility add more value for home coverage.
Plug-In Basic Protection – Kidde CO Detector with Battery Backup
If you want a straightforward carbon monoxide detector without app setup, this Kidde plug-in model is a practical pick. It plugs into a standard 120V outlet, adds AA battery backup for outages, and uses an 85 dB alarm plus LED status lights to keep the basics easy to monitor.
Best For: Buyers who want simple plug-in CO protection with battery backup and no smart features.
Pros:
- Plugs into a standard 120V outlet for easy installation
- 2-AA battery backup helps keep protection active during outages
- 85-decibel alarm provides an audible warning when CO is detected
- Peak Level Memory records the last detected CO event or last test
Cons:
- No phone alerts or Wi-Fi connectivity
- Only offers audible alerts and LED indicators, not smart monitoring
- Uses batteries as backup rather than a fully networked safety system
This is a solid no-frills option if your priority is dependable plug-in detection with simple controls. It covers the essentials well, but shoppers specifically looking for smart carbon monoxide detectors with phone alerts will need to look elsewhere.
Smart Phone Alerts Pick – Heiman Wi-Fi CO Detector
This Heiman model fits the smart carbon monoxide detectors with phone alerts category well because it connects over 2.4 GHz Wi-Fi and sends real-time safety notifications to your phone. It is battery powered, uses an 85 dB alarm, and is designed for quick wall-mount or desktop placement in spaces like bedrooms, kitchens, garages, attics, hotels, and apartments.
Best For: Shoppers who want Wi-Fi carbon monoxide alerts on their phone and a compact battery-powered design.
Pros:
- Real-time notifications can be sent directly to your phone after Wi-Fi setup
- ETL, UL2034, and FCC certifications add reassuring safety credentials
- Compact body supports wall mounting or desk placement
- 10-year sensor life and low-battery warning reduce maintenance hassle
Cons:
- Requires 2.4 GHz Wi-Fi and app setup before phone alerts work
- Battery powered, so it is not a plug-in model
- Only one unit is included in the pack
For buyers focused on app-connected CO monitoring, this is the most feature-aligned choice in the group. Its phone alerts, compact size, and long-life sensor make it a strong fit for everyday home coverage or travel-ready use.
Reliable Plug-In Backup – First Alert CO606 Plug-In Alarm
The First Alert CO606 is a classic plug-in carbon monoxide detector with battery backup for continuous monitoring during outages. It uses an advanced electrochemical sensor, includes a simple test/silence button, and sounds an 85 dB alarm when CO reaches dangerous levels.
Best For: Homeowners who want a proven plug-in CO alarm with battery backup and simple operation.
Pros:
- Plugs into any standard outlet and adds battery backup for power failures
- Advanced electrochemical sensor is designed for accurate CO detection
- Single test/silence button keeps operation simple
- End-of-life signal chirp helps indicate when replacement is due
Cons:
- No phone alerts or smart-home connectivity
- Alarm is audible only, with no app-based monitoring
- Less feature-rich than smart carbon monoxide detectors with phone alerts
This model is a dependable choice if you care more about proven detection and backup power than connected features. It delivers the basics cleanly, but it is not built for remote notifications or app-based oversight.
Matter Thread CO Alarm – Matter CO Detector Battery Powered
If you want smart carbon monoxide detectors with phone alerts that stay compact and flexible, this Heiman model is built around Matter over Thread for modern home setups. It pairs a UL 2034 5th Edition-certified CO sensor with real-time mobile notifications, plus app-based visibility into CO concentration when used with a compatible Thread Border Router hub.
Best For: Homes, apartments, and smart-home users who want compact CO protection with Matter-based phone alerts.
Pros:
- Matter over Thread support works with Apple Home, SmartThings, Home Assistant, Google Home, and Alexa.
- Real-time smartphone alerts and CO concentration viewing through a compatible hub.
- UL 2034 5th Edition certified, ETL listed, and CSFM approved for residential safety.
- Battery powered with magnetic adhesive pads and screw-mount options for easy installation.
Cons:
- Requires a compatible Matter hub with Thread Border Router for smart features.
- Remote alerts need an active internet connection through the hub.
- Not a Wi-Fi-only detector, so it may not fit simpler plug-and-play setups.
This is a strong pick if you already use a Matter ecosystem and want a small, neatly designed CO alarm with reliable certification and app alerts. The automation options and 10-year-stability FIGARO sensor add value for connected households.
Hardwired Whole-Home Alarm – Hardwired Smart Smoke and CO Detector
For buyers comparing smart carbon monoxide detectors with phone alerts, this Kidde hardwired unit stands out because it combines smoke and CO detection in one alarm. It connects over 2.4 GHz Wi-Fi for mobile notifications, adds voice alerts, and can share alerts across compatible hardwired alarms for whole-home coverage.
Best For: Homeowners who want a hardwired, interconnected smoke and CO alarm with app alerts.
Pros:
- Detects both smoke and carbon monoxide in a single hardwired alarm.
- Mobile alerts, low-battery warnings, and hush control through the Kidde app.
- Whole-home smart connectivity by adding just one compatible Kidde smart alarm.
- Comprehensively tested to meet UL 217, UL 2034, and FCC standards.
Cons:
- Requires 2.4 GHz Wi-Fi for setup and app features.
- Hardwired installation is less flexible than battery-only models.
- Designed as a combined smoke/CO alarm, so it may be more than some shoppers need.
This model makes sense if you want one alarm platform to cover both smoke and CO while bringing phone notifications into an existing hardwired system. The interconnected design and app hush feature are especially useful for larger homes.
Plug-In Air Quality Monitor – Smart Carbon Monoxide Monitor with IAQ
If you want smart carbon monoxide detectors with phone alerts plus extra room data, this Kidde plug-in model goes beyond CO-only protection. It delivers real-time notifications through the Kidde app, monitors indoor air quality, humidity, and TVOC levels, and includes low-level CO alerting for earlier warnings.
Best For: Tech-focused households that want CO alerts and indoor air quality monitoring in one plug-in device.
Pros:
- Real-time app notifications with no subscription required.
- Tracks indoor air quality, humidity, and TVOC levels.
- Low-level CO alerts can warn at 30-70 ppm before the higher alarm threshold.
- Plug-in design with AA battery backup and a rotating plug for flexible placement.
Cons:
- Smart notifications are tied to 2.4 GHz Wi-Fi.
- Advanced Home Health insights require an optional paid subscription.
- Best suited to outlet placement, so it is less flexible than battery-only units.
This is the most feature-rich option here if you want more than basic CO detection. The added air-quality insights and early warning behavior make it appealing for users who like connected-home monitoring and wellness tracking.
How We Picked the Best Smart Carbon Monoxide Detectors with Phone Alerts
We focused on Smart Carbon Monoxide Detectors with Phone Alerts that balance dependable detection with practical everyday features. Key factors included UL-listed safety standards, alert delivery methods, backup power, connectivity, and whether the device fits common home setups like plug-in, battery-powered, or hardwired installation.
We also favored models with clear status indicators, strong alarm output, and app or voice-alert support that can help you react faster when you’re not in the same room.
Quick Comparison
If you want the simplest setup, plug-in models are usually the easiest to install. Battery-powered units are better for apartments, older homes, or places without a nearby outlet. Hardwired alarms make sense when you want a more permanent system, especially in homes already wired for interconnected protection.
Some units combine carbon monoxide detection with smoke alarms or indoor air quality monitoring. Those are useful if you want broader coverage, but a dedicated CO detector can be a better fit if your main goal is reliable carbon monoxide alerts and phone notifications.
Key Buying Factors for Smart Carbon Monoxide Detectors with Phone Alerts
Connectivity and App Alerts
Look for Wi-Fi support that works on your home network and offers real-time notifications. A detector is only as useful as its ability to send timely alerts when you’re asleep, traveling, or in another part of the house.
Power Source and Backup
Choose the format that matches your home. Plug-in units should still include battery backup, while battery-powered models need long-life batteries and clear low-battery warnings. Hardwired alarms should also include backup power for outages.
Alarm Volume and Visibility
An 85 dB alarm is common and suitable for many homes. LED indicators and voice alerts can make status checks easier, especially for larger households or anyone who wants clearer guidance during an alarm event.
Smart-Home Compatibility
If you already use Alexa, Matter, or a broader smart-home system, compatibility can make alerts and automation more useful. Just make sure the feature set matches what you actually use at home.
Who Should Buy Which Smart Carbon Monoxide Detectors with Phone Alerts?
Buyers who want the easiest installation should start with a plug-in detector with battery backup. Families in larger homes or those replacing existing alarms may prefer hardwired models with interconnection. Renters and apartment dwellers often do best with battery-powered options that don’t require wiring.
If you want a broader safety upgrade, consider a unit that combines CO detection with smoke detection or indoor air quality monitoring. If your priority is straightforward protection and faster awareness, a dedicated smart CO alarm with app notifications is usually the best place to start.
