Smart CO Detectors: Alerts That Actually Help

When it comes to protecting your home from carbon monoxide, a smart detector can provide peace of mind with real-time alerts and connectivity features. The First Alert CO605 stands out as the best overall pick thanks to its reliable plug-in design and battery backup, ensuring continuous protection. The Kidde Smart Smoke & CO Detector with Ring offers seamless smart home integration, ideal for those wanting connected safety. Meanwhile, the Heiman Smart Carbon Monoxide Detectors provide an affordable interconnected system for larger homes. However, buyers face tradeoffs between features, connectivity, and price. Keep reading for a detailed breakdown to find the best fit for your needs.

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Key Takeaways

• The top picks excel in smart home integration, especially those compatible with Ring and other ecosystems.
• Battery backup remains a key feature for continuous protection during power outages, favoring plug-in models with batteries.
• Interconnected detectors improve safety in larger spaces but often come at a higher price point.
• Ease of installation varies significantly; plug-in units are generally simpler to set up than hardwired or interconnected systems.
• Tradeoffs between smart features, battery life, and price mean buyers should prioritize what safety features matter most to them.

Our Top Carbon Monoxide Smart Detector Picks

First Alert CO605 Plug-in Carbon Monoxide Detector with Battery Backup		Best Overall for Reliable Continuous Monitoring	Power Source: Plug-in with battery backup	Sensor Type: Electrochemical	Alarm Sound: 85 decibels	VIEW ON AMAZON	See Our Full Breakdown
Kidde Smart Smoke & CO Detector with Ring, Hardwire & AA Battery		Best for Smart Home Integration and Dual Detection	Detection: Smoke and Carbon Monoxide	Connectivity: Ring App, Alexa	Power: Hardwired with AA Battery Backup	VIEW ON AMAZON	See Our Full Breakdown
Kidde Carbon Monoxide Detector, Plug-In with 9V Battery Backup, Digital Display, 85 dB Alarm, LED Status Lights		Best for Visual CO Monitoring with Digital Readout	Power Source: 120V AC with 9V battery backup	Display: Digital LED	Alarm Volume: 85 decibels	VIEW ON AMAZON	See Our Full Breakdown
Kidde Smart CO Detector + Indoor Air Quality, Plug-in & AA Battery		Best for Early Warning and Air Quality Monitoring	Detection Technology: Low-level CO sensing	Connectivity: Wi-Fi 2.4 GHz	Alarm Sound: 85 dB	VIEW ON AMAZON	See Our Full Breakdown
Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable		Best for Portable, No-Wiring Safety	Sensor Technology: Electrochemical	Power Source: 2-AA batteries (included)	Alarm Decibel Level: 85 dB	VIEW ON AMAZON	See Our Full Breakdown
Heiman Smart Carbon Monoxide Detectors, 3-Pack Interconnected with Gateway		Best Overall for Whole-Home Safety and Connectivity	Number of units: 3	Connectivity: Wi-Fi, Smart Gateway	Sensor: Japan FIGARO TGS5141 electrochemical	VIEW ON AMAZON	See Our Full Breakdown
Kidde Carbon Monoxide Detector, Battery Powered, Portable for Travel or Home		Best for Portable Use and Travel Flexibility	Sensor Technology: Electrochemical	Power Source: 2 AA batteries (included)	Alarm Volume: 85 dB	VIEW ON AMAZON	See Our Full Breakdown
Kidde Smart Carbon Monoxide Detector, Plug-in & AA Battery Backup		Best for Smart Home Integration and Continuous Monitoring	Power Source: Plug-in with AA battery backup	Alarm Sound: 85 dB	Connectivity: Wi-Fi 2.4 GHz, Alexa and Google compatible	VIEW ON AMAZON	See Our Full Breakdown
Kidde Carbon Monoxide + Explosive Gas Alarm, Plug-in with 9V Battery Backup, Digital Display, 85 dB Alarm		Best for Multi-Gas Detection and Power Outages	Power Source: 120V AC with 9V battery backup	Alarm Sound Level: 85 dB	Display: Digital LED	VIEW ON AMAZON	See Our Full Breakdown
Kidde Smart Smoke & CO Detector with Ring, AA Battery		Best for Dual Detection with Wireless Connectivity	Detection: Smoke and CO	Battery: 2-AA alkaline (included)	Connectivity: Wireless, Ring app, Alexa	VIEW ON AMAZON	See Our Full Breakdown

More Details on Our Top Picks

1. First Alert CO605 Plug-in Carbon Monoxide Detector with Battery Backup

   

   Best Overall for Reliable Continuous Monitoring

   View on Amazon

   This plug-in detector with a battery backup offers dependable, continuous CO detection, especially during power outages, thanks to its electrochemical sensor and 7-year warranty. Compared with the Kidde Digital Display model, it lacks a digital readout but excels in simplicity and ease of use, making it ideal for straightforward home protection. Its loud 85-decibel alarm is effective, but the need to place units on each level or bedroom can be inconvenient for larger homes. The end-of-life signal ensures you replace it timely, although frequent chirping may become annoying over time.

   Pros:

   • Reliable electrochemical sensor for accurate detection
   • Battery backup ensures continuous operation during outages
   • Simple test and silence button for quick checks
   • Long 7-year warranty adds peace of mind

   Cons:

   • Requires placement on multiple levels for full coverage
   • End-of-life signal can be frequent and disruptive

   Best for: Homeowners seeking a dependable, easy-to-maintain CO detector with backup power during outages

   Not ideal for: Large households needing integrated smart alerts or digital readouts for detailed monitoring

   • Power Source:Plug-in with battery backup
   • Sensor Type:Electrochemical
   • Alarm Sound:85 decibels
   • Dimensions:3.4 x 1.38 x 5 inches
   • Warranty:7 years
   Our verdict

   “This detector suits users wanting an uncomplicated, reliable CO alarm with backup power, though it lacks smart features and digital readouts.”

   → See it on Amazon →

2. Kidde Smart Smoke & CO Detector with Ring, Hardwire & AA Battery

   

   Best for Smart Home Integration and Dual Detection

   View on Amazon

   This combo detector provides both smoke and CO alerts via the Ring app, offering real-time notifications and smart home compatibility, which makes it stand out for those invested in connected home systems. Unlike the First Alert model, it integrates with Alexa and Ring, enabling remote alerts and automation. However, it requires hardwiring or batteries, and the optional Ring subscription for 24/7 monitoring adds ongoing costs. Its faster detection and reduced false alarms make it suitable for tech-savvy users wanting comprehensive safety coverage.

   Pros:

   • Dual detection of smoke and CO in a single device
   • Real-time notifications via Ring app and Alexa
   • Fast detection with reduced false alarms
   • Includes both hardwiring and battery backup options

   Cons:

   • Requires Wi-Fi for app notifications
   • Subscription needed for continuous monitoring
   • Additional detectors may be required for full coverage

   Best for: Owners with smart home setups who want integrated alerts for smoke and CO detection

   Not ideal for: Users without Wi-Fi or those seeking a simple standalone detector without ongoing subscription costs

   • Detection:Smoke and Carbon Monoxide
   • Connectivity:Ring App, Alexa
   • Power:Hardwired with AA Battery Backup
   • Standards:UL 217, FCC
   • Subscription:Optional Ring subscription for $5/month
   Our verdict

   “This smart detector is ideal for those wanting integrated, real-time alerts and home automation, but it involves ongoing costs and setup complexity.”

   → See it on Amazon →

3. Kidde Carbon Monoxide Detector, Plug-In with 9V Battery Backup, Digital Display, 85 dB Alarm, LED Status Lights

   

   Best for Visual CO Monitoring with Digital Readout

   View on Amazon

   Compared to the First Alert plug-in, this Kidde model adds a digital display showing real-time CO levels, giving users a clear picture of air quality. Its 10-year limited warranty and peak level memory are strong points, but it requires regular replacement and can be prone to false alarms if installed near cooking appliances. Its multiple mounting options make installation flexible, yet it focuses solely on CO detection, unlike more comprehensive smart options.

   Pros:

   • Digital display showing CO levels from 30-999 ppm
   • Multiple mounting options for flexibility
   • Battery backup for operation during outages
   • Peak level memory recalls highest CO levels

   Cons:

   • Requires replacement every 5-7 years
   • No smart connectivity or app alerts
   • False alarms possible near heat sources

   Best for: Users who prefer real-time CO level readouts and flexible placement options

   Not ideal for: Homeowners seeking smart alerts or integrated app notifications

   • Power Source:120V AC with 9V battery backup
   • Display:Digital LED
   • Alarm Volume:85 decibels
   • Sensor Technology:Electrochemical
   • Warranty:10-year limited
   Our verdict

   “This detector suits those who want a clear digital readout and flexible installation but do not need smart home integration.”

   → See it on Amazon →

4. Kidde Smart CO Detector + Indoor Air Quality, Plug-in & AA Battery

   

   Best for Early Warning and Air Quality Monitoring

   View on Amazon

   This model combines CO detection with indoor air quality monitoring, offering smart alerts via smartphone apps and voice notifications. Its low-level CO sensing allows for early warning, making it suitable for health-conscious users. Unlike the simple plug-in detectors, it requires Wi-Fi and a subscription for full air quality insights, which could be a barrier for some. Its integration with Alexa and Google Home expands its functionality but may be complex for less tech-savvy users.

   Pros:

   • Real-time alerts via smartphone app and voice
   • Early detection through low-level CO sensing
   • Compatible with Alexa and Google Home
   • Includes indoor air quality monitoring (temperature, humidity, TVOC)

   Cons:

   • Requires Wi-Fi connection for notifications
   • Subscription fee for extended air quality insights
   • May be overly complex for basic safety needs

   Best for: Health-conscious homeowners interested in proactive safety and indoor air quality tracking

   Not ideal for: Users seeking a purely standalone CO detector without smart features or ongoing fees

   • Detection Technology:Low-level CO sensing
   • Connectivity:Wi-Fi 2.4 GHz
   • Alarm Sound:85 dB
   • Power Source:Plug-in with AA backup
   • Smart Home Compatibility:Alexa, Google Home
   • Subscription Service:Advanced Home Health ($1.99/month)
   Our verdict

   “This detector offers early CO warning and indoor air quality tracking for smart home users, though it involves ongoing costs and setup complexity.”

   → See it on Amazon →

5. Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable

   

   Best for Portable, No-Wiring Safety

   View on Amazon

   Designed for easy, wiring-free safety, this battery-powered CO alarm is ideal for renters or those needing a portable option. Its simple design with LED indicators, peak level memory, and test-hush button makes it straightforward to operate, and its portability allows for flexible placement. However, it offers no digital CO level readout or smart features and requires battery changes every few years. Its 10-year warranty covers only the alarm component, not the batteries.

   Pros:

   • No wiring required, easy to install
   • Operates during power outages on batteries
   • Portable and versatile for different locations
   • Includes peak level memory and test-hush button

   Cons:

   • Battery replacement required every few years
   • Limited to 10-year warranty on the alarm only
   • No digital display or smart connectivity

   Best for: Renters or travelers needing a portable, easy-to-install CO detector

   Not ideal for: Homeowners wanting integrated smart alerts or detailed CO level data

   • Sensor Technology:Electrochemical
   • Power Source:2-AA batteries (included)
   • Alarm Decibel Level:85 dB
   • LED Indicators:Green for power, Red for alarm
   • Peak Level Memory:Yes
   • Warranty:10 years
   Our verdict

   “This portable battery-powered detector is best for temporary or rental use, though it lacks digital readouts and smart features.”

   → See it on Amazon →

6. Heiman Smart Carbon Monoxide Detectors, 3-Pack Interconnected with Gateway

   

   Best Overall for Whole-Home Safety and Connectivity

   View on Amazon

   This set of three interconnected detectors stands out for providing comprehensive coverage across an entire home. The inclusion of a smart gateway allows for seamless app monitoring and real-time alerts, making it easier to stay informed from anywhere. Compared to standalone detectors like the Kidde portable model, the Heiman system offers better integration and reliable whole-home protection, but the setup can be more complex for non-technical users. The electrochemical sensor from Japan ensures accurate detection, and UL 2034 certification adds peace of mind. However, it relies on a compatible smart home ecosystem for automation, and the 10-year battery life may require attention as batteries age.

   Pros:

   • Interconnected alarms provide comprehensive protection across multiple rooms
   • App alerts and remote monitoring boost safety awareness
   • UL 2034 certified and CSFM approved for trusted reliability
   • Compact design easily fits in small or tight spaces

   Cons:

   • Requires an existing compatible smart home ecosystem for automation features
   • Setup can be complex for users unfamiliar with smart devices
   • Battery life, while rated for 10 years, may need replacement if batteries fail prematurely

   Best for: Homeowners seeking reliable, interconnected CO detection with app control and whole-house coverage

   Not ideal for: Renters or apartment dwellers who prefer simple, portable solutions without smart home integration

   • Number of units:3
   • Connectivity:Wi-Fi, Smart Gateway
   • Sensor:Japan FIGARO TGS5141 electrochemical
   • Battery:Included, battery-powered
   • Certification:UL 2034, CSFM Approved
   • Dimensions:2.75 x 2.75 x 1.45 inches
   • Weight:3.5 oz
   • Warranty:10 years
   Our verdict

   “This pick is ideal for tech-savvy homeowners who value integrated, whole-home CO safety with remote management.”

   → See it on Amazon →

7. Kidde Carbon Monoxide Detector, Battery Powered, Portable for Travel or Home

   

   Best for Portable Use and Travel Flexibility

   View on Amazon

   The Kidde portable CO detector makes a solid choice for individuals who need a battery-powered, easy-to-carry device. Its electrochemical sensor ensures accurate detection, and the 85 dB alarm paired with LED indicators offers clear alerts. Compared with the smart, interconnected options like the Heiman system, this detector is simple to use but lacks app connectivity or automation. It’s perfect for travel or temporary use around the home, especially in places where wiring isn’t feasible. The main tradeoff is its reliance on batteries, which will require replacement, and the absence of smart features limits remote management.

   Pros:

   • Portable and easy to carry for travel or temporary use
   • Wired-free installation simplifies setup
   • Operates during power outages on battery power
   • Clear LED indicators and loud alarm for quick awareness

   Cons:

   • Battery life may decline over time, requiring replacements
   • Limited to detecting only CO, no smart alerts or integrations
   • No backup power source beyond batteries

   Best for: Travelers or renters needing a portable, standalone CO detector without smart home features

   Not ideal for: Homeowners seeking integrated or app-controlled safety solutions

   • Sensor Technology:Electrochemical
   • Power Source:2 AA batteries (included)
   • Alarm Volume:85 dB
   • Indicators:Green LED for power, red LED for CO detection
   • Edition:3rd
   • Dimensions:Not specified
   • Weight:Not specified
   • Warranty:Not specified
   Our verdict

   “This device is best suited for individuals who need a simple, portable CO alarm without smart features for travel or temporary situations.”

   → See it on Amazon →

8. Kidde Smart Carbon Monoxide Detector, Plug-in & AA Battery Backup

   

   Best for Smart Home Integration and Continuous Monitoring

   View on Amazon

   This smart CO detector offers real-time alerts via the Kidde app and integrates smoothly with voice assistants like Alexa and Google Home. Unlike the portable Kidde model, this unit combines plug-in power with battery backup, ensuring continuous operation. Its Wi-Fi connectivity allows for instant notifications, a feature that surpasses basic detectors and aligns with the needs of busy households. The 10-year limited warranty provides reassurance, but reliance on Wi-Fi means setup can be tricky for some users, and the device’s smart features are limited by network stability. It’s an excellent choice for those who prioritize remote alerts and smart home compatibility over simplicity.

   Pros:

   • Real-time app notifications keep you informed remotely
   • Easy setup with QR code and smart home ecosystem integration
   • Backup batteries ensure continuous protection during outages
   • Loud 85 dB alarm for immediate local alerts

   Cons:

   • Requires a stable Wi-Fi connection for smart features
   • Limited 10-year warranty may not appeal to long-term users
   • Setup process can be complex for some users unfamiliar with smart devices

   Best for: Homeowners who want seamless smart integration with remote alerts and voice assistant compatibility

   Not ideal for: Users with unreliable Wi-Fi or who prefer non-connected, purely local alarms

   • Power Source:Plug-in with AA battery backup
   • Alarm Sound:85 dB
   • Connectivity:Wi-Fi 2.4 GHz, Alexa and Google compatible
   • Standards:UL 2034, 5th Edition, ETL Listed
   • Warranty:10-year limited
   • Dimensions:Not specified
   • Weight:Not specified
   • Additional Features:Voice assistant integration
   Our verdict

   “This pick is best for households wanting a connected, smart CO detector with remote notifications and voice assistant support.”

   → See it on Amazon →

9. Kidde Carbon Monoxide + Explosive Gas Alarm, Plug-in with 9V Battery Backup, Digital Display, 85 dB Alarm

   

   Best for Multi-Gas Detection and Power Outages

   View on Amazon

   This device combines CO detection with explosive gas sensing, making it suitable for environments where multiple gases pose risks. Its digital display offers real-time gas level readings, setting it apart from basic alarms like the portable Kidde. The plug-in design with 9V battery backup ensures operation during power outages, though it requires a standard outlet, limiting placement flexibility. Compared to the Heiman interconnected system, this alarm focuses on specific gas detection rather than whole-home coverage, but it’s a reliable choice for targeted safety. False alarms from cooking or steam could be an issue, requiring careful placement and maintenance.

   Pros:

   • Easy to install with plug-in design and included extension cord
   • Digital display provides real-time gas level readings
   • Battery backup maintains operation during outages
   • Peak level memory and hush feature improve usability

   Cons:

   • Limited to plug-in outlets, reducing placement options
   • Prone to false alarms from steam or cooking fumes
   • Does not include smart connectivity or app alerts

   Best for: Homeowners needing multi-gas detection with clear readings and backup during outages

   Not ideal for: Renters or those seeking integrated smart home solutions for whole-house safety

   • Power Source:120V AC with 9V battery backup
   • Alarm Sound Level:85 dB
   • Display:Digital LED
   • Sensor Technology:Electrochemical
   • Certifications:UL certified
   • Warranty:6 years
   Our verdict

   “This detector is best suited for those who want reliable, multi-gas detection with clear readings and backup power support.”

   → See it on Amazon →

10. Kidde Smart Smoke & CO Detector with Ring, AA Battery

    

    Best for Dual Detection with Wireless Connectivity

    View on Amazon

    This smart combination detector covers both smoke and CO, providing comprehensive safety alerts through the Ring app. It stands out for its rapid detection capabilities and easy battery-powered installation, making it suitable for homes without wiring. Compared to standalone CO detectors like the Kidde portable model, this device offers the convenience of wireless interconnectivity across multiple alarms, enhancing whole-home safety. However, it relies heavily on Wi-Fi and a Ring subscription for full monitoring, which could be a limitation for some. Its compatibility with Alexa adds voice notification, but some users may find the setup process less straightforward than simpler models.

    Pros:

    • Real-time alerts for both smoke and CO via Ring app
    • Wireless interconnectivity for whole-home safety coverage
    • Faster detection compared to traditional alarms
    • Easy battery-powered installation

    Cons:

    • Dependent on Ring subscription for continuous monitoring
    • No wired connection option
    • Wi-Fi dependency can affect reliability if network issues occur

    Best for: Homeowners wanting combined smoke and CO detection with smart home app alerts

    Not ideal for: Those without reliable Wi-Fi or who prefer wired alarms without smart features

    • Detection:Smoke and CO
    • Battery:2-AA alkaline (included)
    • Connectivity:Wireless, Ring app, Alexa
    • Standards:UL 217, FCC
    • Additional Features:Wireless interconnectivity, faster detection
    • Warranty:Not specified
    • Dimensions:Not specified
    Our verdict

    “This option is ideal for users wanting dual detection with easy installation and smart app alerts, provided Wi-Fi is stable.”

    → See it on Amazon →

How We Picked

These products were evaluated based on their connectivity features, ease of installation, battery backup options, build quality, and user safety alerts. We prioritized detectors that integrate seamlessly with popular smart home platforms and those that provide reliable alerts even during power outages. Price was considered relative to feature set, aiming to highlight options suitable for various budgets. The ranking reflects a balance of performance, usability, and value, ensuring that each pick offers a distinct advantage for different types of buyers.

Factors to Consider When Choosing Carbon Monoxide Smart Detector

Choosing the right carbon monoxide smart detector involves considering several key factors beyond basic detection. It’s essential to evaluate how well the device integrates with your existing smart home system, its power options, and the type of alerts it provides. Investing in a detector with reliable alerts and easy setup can significantly enhance your home safety. Understanding these broader considerations helps avoid common pitfalls, such as buying a device that’s incompatible with your smart home ecosystem or lacking a backup power source.

Connectivity and Smart Home Integration

A primary factor for many buyers is how well the detector connects with their existing smart home system. Devices compatible with platforms like Ring, Alexa, or Google Home allow for remote monitoring and integration with other security devices. However, compatibility can vary, so verifying your current ecosystem is crucial. Keep in mind that some detectors require hubs or gateways, which can add complexity and cost to your setup.

Power Options and Backup

Many detectors rely on plug-in power, but battery backup is vital in case of power outages. Consider whether a device offers a replaceable or rechargeable battery and how it signals low power. Portable, battery-powered units are also useful for temporary or travel safety but lack permanent installation benefits. A combination of both power types often provides the most reliable protection.

Alert Types and Notification Features

Effective detection isn’t just about sensing carbon monoxide; clear, loud alarms are essential. Look for models with digital displays for easy status checks and low-battery indicators. Smart notifications via smartphones can be lifesaving, especially when you’re away from home. Some detectors also offer voice alerts, which can be helpful for hearing-impaired users or noisy environments.

Ease of Installation and Maintenance

A detector’s setup process impacts how quickly you can get your home protected. Plug-in units tend to be simpler, while hardwired systems may require professional installation. Maintenance considerations include sensor lifespan, replaceable batteries, and how easy it is to test and reset the device. Choosing a detector with straightforward maintenance routines saves time and ensures ongoing safety.

Price and Value Considerations

While more expensive models often include advanced features like smart integration and interconnected alarms, budget-friendly options can still provide reliable detection. Balance your safety needs with what fits your budget, but avoid sacrificing critical features like backup power or clear alerts. Investing slightly more can pay off in added peace of mind and long-term reliability.

Frequently Asked Questions

Do smart carbon monoxide detectors require a hub or gateway?

Many smart detectors do require a hub or gateway for full functionality, especially those that connect via Z-Wave or Zigbee protocols. However, some models integrate directly with Wi-Fi and connect straight to your home network, allowing app notifications without extra hardware. It’s important to check compatibility with your existing smart home system to avoid additional setup costs or complexity.

How long do smart CO detectors last before needing replacement?

Most smart carbon monoxide detectors have a lifespan of around 5 to 7 years, depending on the model and sensor type. Digital displays can help track sensor health, but eventually, the sensing element degrades and requires replacement. Regular testing and following manufacturer guidelines for maintenance extend their effective service life and ensure continued safety.

Can I connect multiple detectors for better safety coverage?

Yes, interconnected detectors can improve safety by triggering alarms in multiple rooms simultaneously. Many smart models support wireless interconnection, allowing you to expand coverage without extensive wiring. However, the setup process can vary, and higher costs may be involved. For larger homes, investing in a multi-unit system can significantly enhance early warning capabilities.

Are smart CO detectors worth the extra cost over basic models?

Smart detectors offer added convenience and safety features, such as remote alerts, real-time monitoring, and integration with other smart home devices. These capabilities can provide peace of mind, especially when you’re away or asleep. While they tend to cost more upfront, the ability to respond quickly to alerts and monitor your home remotely often justifies the expense for many users.

What should I look for in a portable CO detector for travel?

A portable CO detector should be lightweight, easy to operate, and have a long battery life. Look for models with simple test/reset functions and clear indicator lights. While these units are less comprehensive, they offer an extra layer of safety when staying in unfamiliar places or RVs. Confirm that the device is certified for safety standards to ensure reliable detection on the go.

Conclusion

For those seeking a reliable, all-around option, the First Alert CO605 offers excellent balance between features and ease of use, making it the best overall choice. Budget-conscious buyers will appreciate the Kidde Smart Smoke & CO Detector with Ring for its smart integration without breaking the bank. If you want advanced connectivity and home automation compatibility, the Heiman Smart Carbon Monoxide Detectors provide a cost-effective interconnected solution. For complete beginners, a plug-in model with battery backup simplifies installation. Ultimately, your choice depends on your specific safety priorities, home size, and smart home ecosystem compatibility.