Best HomeKit Smoke and CO Alarms for Apple Home in 2026

Short answer: Native HomeKit smoke and carbon-monoxide alarms are unusually scarce in 2026. First Alert’s Onelink Safe & Sound 1039102 is the strongest documented native HomeKit option if you can verify legitimate stock and ongoing support, but First Alert currently describes it as backordered. The battery-powered Onelink 1042136 and hardwired Onelink 1042135 are documented HomeKit products, yet both are officially discontinued.

For most Apple households, the practical current approach is to install code-compliant conventional smoke and CO alarms and add a HomePod’s Sound Recognition feature as an auxiliary notification layer. That can notify Apple devices when HomePod hears an alarm, but it is not a replacement for a listed smoke or CO alarm and does not expose the detector’s sensor status in Apple Home.

At a glance

In this category, availability is part of the product decision. A model can be the best technical match for Apple Home and still be a poor purchase if it is discontinued, old marketplace stock, unsupported by the manufacturer, or close to its replacement date.

#	Preview	Product	Price
1		X-Sense Smoke Detector Carbon Monoxide Detector Combo, SC07, 1-Pack | 10-Year Sealed Battery (Not...	$36.99	Buy on Amazon
2		First Alert Battery Combination Smoke & Carbon Monoxide Alarm | SMCO100	$36.99	Buy on Amazon
3		Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery, 30CUD10, 1 Pack	$60.00	Buy on Amazon
4		X-Sense Smoke Detector and Carbon Monoxide Detector, SC01, 1-Pack	$37.99	Buy on Amazon

As an Amazon Associate I earn from qualifying purchases.

1. First Alert Onelink Safe & Sound 1039102: best native HomeKit feature set

The Onelink Safe & Sound 1039102 is the most capable documented native HomeKit option in this comparison. It is a hardwired combination smoke and carbon-monoxide alarm with:

• A photoelectric smoke sensor
• An electrochemical carbon-monoxide sensor
• Apple HomeKit and Apple Home app support
• Mobile alerts
• AirPlay 2 support
• A built-in Alexa service
• An integrated speaker
• A nightlight
• Battery backup for the hardwired alarm

It also supports HomeKit scenes, which makes it more than a standalone alarm that merely sends a notification. The combination of a hardwired installation, battery backup, smoke and CO sensing, and Apple Home support gives it the strongest feature set of the documented Onelink models.

#1 Best Overall

Sale

X-Sense Smoke Detector Carbon Monoxide Detector Combo, SC07, 1-Pack | 10-Year Sealed Battery (Not Hardwired), 2-in-1 Smoke & CO Detection, LCD Display, UL 217 & UL 2034 Certified

• Please Note: The SC07 is a basic standalone unit. It does not support wireless interconnection, Wi-Fi, or base station connection; for wireless interconnection, search for SC07-W
• 10-Year Protection, Zero Maintenance: A built-in sealed lithium battery powers the alarm for a full decade—no battery replacements, no late-night low-battery chirps, and no ladder climbing
• Photoelectric Smoke Sensor and Electrochemical CO Sensor: Responds faster to slow-smoldering fires, helps reduce cooking-related false alarms, and reliably detects dangerous carbon monoxide
• Simple Installation: No rewiring required; easily mount this smoke and carbon monoxide alarm on a wall or ceiling using the included mounting bracket, screws, and anchor plugs
• Meets UL 217 & UL 2034 Safety Standards: Independently tested and certified to meet UL 217 and UL 2034 standards for smoke and carbon monoxide detection; clear certification markings help support safety checks and code-compliant installation

$36.99

Buy on Amazon

The installation advantage

First Alert describes the Safe & Sound as a replacement for compatible hardwired alarms using adapter plugs. That can reduce the need to rewire a home, but “compatible” matters: do not assume that an adapter plug makes every existing alarm box, interconnect arrangement, or wiring configuration suitable. Check the manufacturer’s compatibility information and local electrical requirements before installation. If you are not comfortable working with hardwired alarms, use a qualified installer.

The availability problem

First Alert’s product page currently describes the 1039102 as backordered. That status may change, but it means this is not a normal, broadly available recommendation. A retailer listing does not by itself prove that the product is new, authorized, supported, or within its usable service life.

If you find one, verify the exact model number, manufacturing date, certification markings, seller reputation, return policy, and warranty terms. Pay particular attention to old stock: a sealed backup battery or unopened packaging does not make an aging alarm equivalent to a newly manufactured one.

Verdict: The Onelink Safe & Sound 1039102 is the best native HomeKit smoke and CO alarm if you can verify legitimate current stock and support. It is not a blanket recommendation to buy any marketplace listing at any price.

2. First Alert Onelink 1042136: best battery-powered legacy option

The First Alert Onelink 1042136 is the relevant model for rooms without existing hardwired alarm wiring. First Alert documents it as a battery-powered two-in-one smoke and CO alarm with:

• Photoelectric smoke sensing
• Electrochemical CO sensing
• Apple HomeKit compatibility
• Mobile notifications
• Voice alerts
• Wireless interconnection
• Approximately five years of battery life

The battery-powered design makes it easier to place in a room where running alarm wiring would be impractical. Wireless interconnection can also be useful when several compatible alarms need to communicate without new interconnect wiring.

Why this is a legacy recommendation

First Alert’s store page explicitly marks model 1042136 as discontinued and no longer available for purchase. That changes how it should be evaluated. It is a documented HomeKit option for existing Onelink owners or readers who locate verified remaining stock, not a dependable mainstream 2026 purchase.

If you consider a marketplace listing for the Onelink 1042136, check all of the following before paying:

Rank #2

First Alert Battery Combination Smoke & Carbon Monoxide Alarm | SMCO100

• First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
• Provides reliable 2-in-1 protection against both smoke and carbon monoxide
• End-of-life warning lets you know when it’s time to replace the alarm
• Battery-operated alarm allows for easy installation and maintenance
• Test/silence button for efficient testing to ensure alarm is working properly

$36.99

Buy on Amazon

• The manufacture date printed on the alarm or packaging
• Whether the battery is sealed, intact, and still within the manufacturer’s service guidance
• Required certification markings and labeling
• Whether the seller is reputable and offers a meaningful return period
• Whether the seller can support a warranty claim
• Whether the alarm can still be set up and supported by the relevant Onelink software and Apple Home environment

Do not confuse the stated approximately five-year battery life with the alarm’s total service life. Battery duration tells you how long the battery is expected to operate under stated conditions; it does not mean an alarm can remain installed indefinitely.

Verdict: The 1042136 is the best battery-powered legacy HomeKit option, but its discontinued status makes age, condition, support, and return protection more important than the product name alone.

3. First Alert Onelink 1042135: best legacy hardwired alternative

The First Alert Onelink 1042135 is the hardwired counterpart worth considering when replacing an existing wired alarm system. Its documented features include:

• Photoelectric smoke sensing
• Electrochemical CO sensing
• Apple HomeKit compatibility
• Mobile alerts
• Voice and location warnings
• Interconnection capability
• A sealed ten-year lithium backup battery

The sealed backup battery is convenient because it avoids routine battery replacement during its stated battery period. It does not, however, eliminate the need to check the alarm’s manufacture date, end-of-life instructions, and local replacement requirements. A sealed ten-year battery is not automatically a ten-year guarantee that the entire alarm may remain in service.

Who should consider it?

This model is most relevant to a homeowner who already has a compatible hardwired installation, wants native HomeKit support, and finds verified remaining stock from a reputable seller. It may also make sense for an existing Onelink household trying to maintain a consistent system.

First Alert’s store page marks the 1042135 as discontinued. Therefore, it should not be presented as the default current replacement for every hardwired alarm. Check the product’s age, packaging, certification markings, warranty, and return policy before installation. Also verify that the replacement is compatible with the existing wiring and interconnect system; HomeKit compatibility does not guarantee compatibility with every alarm circuit.

Verdict: The 1042135 is the best legacy hardwired Onelink option, subject to careful stock, age, warranty, and installation checks.

Why First Alert SC5 is not a HomeKit pick

First Alert’s current smart-alarm lineup is centered on the SC5, including the battery and hardwired SMCO600NV and SMCO600NV-AC models. These products are positioned as connected replacements for Nest Protect and are described as working with the First Alert and Google Home ecosystems.

Rank #3

Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery, 30CUD10, 1 Pack

• 2-in-1 DETECTION: Model 30CUD10 detects both smoke and carbon monoxide with advanced sensing technology engineered with over 25% faster smoke detection*; features a red LED light for clear visual notification suitable for homes
• 10-YEAR BATTERY OPERATION: Built-in 10-year battery powers the alarm continuously; no low-battery chirps, saves up to $40 over the life of the alarm in battery replacements and includes a 10-year limited warranty** from date of purchase
• REDUCED FALSE ALARMS: Uses advanced sensing technology that helps distinguish between real smoke and everyday cooking or steam; helps reduce false alarms while maintaining quick, accurate detection when smoke is present
• TESTED FOR SAFETY & PERFORMANCE: Rigorously tested to meet UL 217 10th Edition, UL 2034 5th Edition , and FCC standards; designed to help ensure reliable performance and compliance with recognized safety requirements
• BUILT FOR HOMEOWNERS AND PROFESSIONALS: Designed for those who prioritize dependable, code-compliant detection; supports safety goals for homeowners, property managers, contractors, and professionals seeking long-term home safety assurance

$60.00

Buy on Amazon

First Alert’s compatibility information says Nest Protect compatibility requires the Google Home app and a Google Account. The SC5 materials emphasize mobile alerts, voice warnings, app-based testing, interconnection, and replacement of Nest Protect. They do not document Apple HomeKit support.

That distinction is decisive:

• Smart does not automatically mean HomeKit-compatible.
• Works with Google does not mean it appears in Apple Home.
• Replaces Nest Protect does not mean it replaces a HomeKit alarm.
• A product can send phone notifications through one platform while being entirely absent from another.

For a Google Home household, the SC5 may be a relevant current connected-alarm comparison. For someone specifically seeking a native smoke or CO device in Apple Home, it is not a documented substitute for Onelink.

Do not buy an SC5 expecting HomeKit scenes, Apple Home alarm status, or native Apple Home notifications unless First Alert publishes current documentation expressly adding those capabilities.

HomePod Sound Recognition: the practical Apple workaround

If you cannot find a trustworthy current Onelink alarm, the most practical Apple-oriented setup is a conventional, code-compliant smoke and CO alarm combined with HomePod Sound Recognition.

Apple documents Sound Recognition as a feature that can listen for the sound of a smoke or CO alarm and send a notification to an iPhone, iPad, or Apple Watch. The relevant control is in the Home app under Safety & Security. Apple’s current requirements specify HomePod software 26 or later and the updated Home architecture.

How to enable it

1. Make sure the home uses the updated Home architecture.
2. Update the HomePod to software 26 or later.
3. Open the Apple Home app.
4. Open the home’s settings and go to Safety & Security.
5. Enable the Sound Recognition setting for smoke and CO alarm sounds, then follow the on-screen instructions.
6. Confirm that notifications are enabled on the Apple devices that should receive them.

Apple warns that Sound Recognition may fail to recognize an alarm and should not be relied upon in high-risk or emergency circumstances. HomePod is listening for an audible alarm; it is not measuring smoke or carbon-monoxide levels, replacing the listed alarm, or guaranteeing that an alert will arrive.

What this workaround can and cannot do

A HomePod mini may be worth considering for readers who already use Apple Home and want this auxiliary notification layer. Treat it as a listening device that supplements the alarms—not as the safety device itself. Place and configure the underlying alarms according to the manufacturer’s instructions and local code.

Which setup should you choose?

Choose the Safe & Sound if all of these are true

• You specifically need native Apple Home or HomeKit integration.
• You have a compatible hardwired alarm location.
• You can verify genuine, sufficiently recent stock.
• The seller and manufacturer support situation are acceptable.
• You are prepared to confirm adapter-plug and wiring compatibility.

Choose a legacy 1042136 only if

• You need a battery-powered form factor.
• You understand that the model is discontinued.
• You can verify the manufacture date and condition.
• You have strong return protection if setup or support fails.
• You are not treating a marketplace listing as proof of current manufacturer support.

Choose a legacy 1042135 only if

• You are replacing a compatible hardwired alarm.
• Native HomeKit support is more important than having a current product family.
• You find verified remaining stock with acceptable age and warranty terms.
• The wiring, interconnect arrangement, and local requirements have been checked.

Choose conventional alarms plus HomePod Sound Recognition if

• You want a realistic current-market option without depending on discontinued Onelink stock.
• Your priority is an additional Apple notification rather than native alarm status in Home.
• You understand that sound recognition is supplementary and can fail.
• You will continue maintaining the actual smoke and CO alarms properly.

Smoke and CO alarm placement and maintenance

Smart-home integration does not change the basic life-safety requirements. In the United States, the Consumer Product Safety Commission recommends smoke alarms on every level of the home, outside sleeping areas, and inside each bedroom. It recommends CO alarms on each level and outside sleeping areas.

NFPA guidance similarly recommends smoke alarms in every bedroom, outside each separate sleeping area, and on every level. Interconnected alarms provide the best protection because when one alarm senses a problem, the others can sound as well, subject to the compatibility and installation rules of the alarm manufacturer.

Rank #4

Sale

X-Sense Smoke Detector and Carbon Monoxide Detector, SC01, 1-Pack

• 2-in-1 Protection: The smoke and carbon monoxide detector is equipped with both photoelectric smoke sensor and electrochemical CO sensor that both detect smoke and dangerous CO levels
• ETL Listed: The smoke and carbon monoxide alarm meets the UL 217 & UL 2034 safety standards for your peace of mind and absolute confidence in our product
• Simple Installation: Requires no rewiring; easy to mount this fire and CO alarm on any wall or ceiling with the included mounting bracket, screws and anchor plugs
• Combination Alarm with CO Readings: the large LCD display clearly indicates real-time carbon monoxide (CO) levels in the surrounding air, as well as its battery level and working status

$37.99

Buy on Amazon

Use this maintenance checklist

• Test monthly: Test every alarm according to its instructions, including interconnected units where applicable.
• Replace batteries as required: For alarms with replaceable batteries, follow the manufacturer’s schedule; CPSC guidance includes annual battery replacement where applicable.
• Track manufacture dates: NFPA guidance says smoke alarms should be replaced when they are more than ten years old. Follow the specific alarm’s end-of-life instructions if they require earlier action.
• Do not confuse battery life with alarm life: A five-year battery claim and a sealed ten-year backup battery describe battery expectations, not permission to keep an old alarm indefinitely.
• Keep alarms in the required locations: Smart notifications are not a reason to remove an alarm from a bedroom, outside a sleeping area, or another code-required position.
• Use compatible interconnection: Wireless, hardwired, and mixed-model interconnection systems are not automatically interchangeable.
• Follow local code: Building, electrical, rental, and fire-code requirements can differ by jurisdiction. Local requirements take priority over a generic online buying guide.
• Never disable an alarm to solve nuisance alarms: Address placement, contamination, cooking-related triggers, or manufacturer troubleshooting instead.

How to buy discontinued Onelink stock safely

Because the two older Onelink models are discontinued and the Safe & Sound is described as backordered, a careful purchasing process matters more than usual.

1. Search by the complete model number. Confirm whether the listing is for 1039102, 1042136, or 1042135 rather than a similarly named First Alert product.
2. Ask for the manufacture date. Do not rely only on the seller’s description of the item as new.
3. Inspect the packaging and labels. Look for intact packaging, required certification markings, installation instructions, and signs of storage damage.
4. Check the battery situation. A sealed battery can still be old. For replaceable-battery models, confirm what is included and whether it has been stored properly.
5. Confirm return terms before ordering. A discontinued smart alarm may fail during setup even when the physical unit appears unused.
6. Verify support expectations. Confirm whether the seller and manufacturer still support activation, app setup, firmware, and warranty service for that model.
7. Do not mix systems casually. HomeKit pairing, alarm interconnection, and physical wiring are separate compatibility questions.

If a listing is unusually expensive because the model is scarce, compare that cost with the price and availability of a compliant current alarm plus an auxiliary notification setup. Native HomeKit integration is useful, but it should not justify compromising on alarm age, certification, installation, or support.

Bottom line

There is no broad field of current, readily available HomeKit smoke and CO alarms to rank in 2026. The First Alert Onelink Safe & Sound 1039102 is the best documented native HomeKit choice if you can verify authentic stock and support. The Onelink 1042136 and 1042135 remain useful legacy references for battery-powered and hardwired installations, but both are officially discontinued.

The current First Alert SC5 is a Google-oriented connected alarm, not a documented Apple HomeKit product. For many Apple households, properly installed conventional alarms plus HomePod Sound Recognition are the more realistic current path to Apple notifications—provided you treat Sound Recognition as an imperfect supplement rather than a detector replacement.

Frequently Asked Questions

Does the First Alert SC5 work with Apple HomeKit?

First Alert’s current SC5 documentation describes compatibility with Google Nest Protect, the First Alert ecosystem, and Google Home. It does not document Apple HomeKit support, so it should not be purchased as a native Apple Home alarm unless First Alert publishes updated compatibility information.

Can HomePod Sound Recognition replace a smoke or CO alarm?

No. HomePod listens for the sound of an alarm and may send a notification, but it does not measure smoke or carbon monoxide and Apple warns that recognition can fail. Use listed smoke and CO alarms installed according to local code and manufacturer instructions.

Are the First Alert Onelink 1042136 and 1042135 still available?

First Alert’s store pages mark both models as discontinued. Marketplace listings may exist, but buyers should verify the manufacture date, condition, certification markings, seller, return policy, warranty, and remaining support before purchase.

What is the best native HomeKit smoke and CO alarm in 2026?

The First Alert Onelink Safe & Sound 1039102 has the strongest documented native HomeKit feature set in this comparison. First Alert currently describes it as backordered, so it is best viewed as the leading option only when legitimate current stock and support can be confirmed.

How often should smoke alarms be replaced?

NFPA guidance says smoke alarms should be replaced when they are more than ten years old. Check each model’s manufacture date and end-of-life instructions, and do not mistake a battery-life claim for the service life of the complete alarm.

The Bottom Line

Best native HomeKit choice: First Alert Onelink Safe & Sound 1039102, if genuine current stock and support are verified. Best practical current Apple setup: properly installed conventional smoke and CO alarms with HomePod Sound Recognition as an additional, not primary, notification layer.

Quick Recap

SaleBestseller No. 1

X-Sense Smoke Detector Carbon Monoxide Detector Combo, SC07, 1-Pack | 10-Year Sealed Battery (Not Hardwired), 2-in-1 Smoke & CO Detection, LCD Display, UL 217 & UL 2034 Certified

$36.99

Bestseller No. 2

First Alert Battery Combination Smoke & Carbon Monoxide Alarm | SMCO100

Provides reliable 2-in-1 protection against both smoke and carbon monoxide; End-of-life warning lets you know when it’s time to replace the alarm

$36.99

Bestseller No. 3

Kidde Smoke & Carbon Monoxide Detector, 10-Year Battery, 30CUD10, 1 Pack

$60.00

SaleBestseller No. 4

X-Sense Smoke Detector and Carbon Monoxide Detector, SC01, 1-Pack

$37.99

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.