Best Smart Smoke Detectors (2026): 6 App-Connected Picks

We may earn commission from links on this page. Lead-form submissions are forwarded to local inspector partners. How we research and review.

The best smart smoke detector does everything a good conventional smoke alarm does, and then tells your phone about it. That second job is the reason to buy one: a local siren in an empty house warns nobody, while an app alert reaches you at work, on vacation or at a rental you manage. The details that separate smart alarms are how they connect (Wi-Fi, a gateway hub or Matter over Thread), whether they interconnect so every alarm in the house sounds together, what certification each listing actually names, and whether the app needs a subscription. This guide compares six app-connected alarms on those points. For conventional alarms and sensor-type basics, start with our best smoke detector roundup.

Part of our Home Inspection Tools guide — start there for the full picture →

As an Amazon Associate we earn from qualifying purchases.

How we compared: we compared 13 current Amazon listings for smart smoke and smoke-and-CO alarms on what each listing states: app or platform, power source, interconnect method, voice alerts, sensor type, certifications named, end-of-life signaling and any subscription. Two listings are not app-connected smoke alarms, an interconnected X-Sense combo without Wi-Fi and a plug-in Kidde CO-only alarm, so 11 listings are true smart smoke alarms. We did not test any alarm with smoke or CO, or use any app hands-on. Prices and plan terms change, so check the current listing before buying.

Quick picks: the best smart smoke detectors by use case

Product	Best for	Key features	Price	Buy
Kidde 30CUAR-W	Hardwired smart smoke and CO	Names UL 217 and UL 2034 Hush false alarms from the phone One unit relays hardwired alarms	$74.97as of Oct 20, 2026 7:08 am GMT+0000	Buy now →Check current price
Kidde RGCUDR-RW (Ring)	Battery smart combo, no wiring	Ring app alerts, no plan needed Wire-free interconnect Low-level CO mobile alerts	$69.97as of Oct 20, 2026 7:08 am GMT+0000	Buy now →Check current price
Heiman S1-R 6-Pack + Gateway	Whole-home battery kit	Names UL 217 10th Edition 10-year CR123A battery Interconnects locally without Wi-Fi	$175.99as of Oct 20, 2026 7:08 am GMT+0000	Buy now →Check current price
First Alert SC5 Hardwire	Replacing a Nest Protect	Compatible with Nest Protect Voice says type and location Quick Connect plug	$128.79as of Oct 20, 2026 7:08 am GMT+0000	Buy now →Check current price
Heiman S1-TM Matter	Apple Home and Matter homes	Matter over Thread, no Wi-Fi Temperature and humidity sensor Names UL 217 10th Edition	$44.98as of Oct 19, 2026 8:58 pm GMT+0000	Buy now →Check current price
Kidde 20SAR-W	Hardwired smoke-only on a budget	End-of-life alarm at 10 years Hush from the phone Names UL 217 8th and 9th Ed.	$54.97as of Oct 20, 2026 7:08 am GMT+0000	Buy now →Check current price

Prices are Amazon’s listed prices as of the time shown and change often; check Amazon for today’s price. As an Amazon Associate we earn from qualifying purchases.

The six picks, compared listing by listing

1. Kidde 30CUAR-W — Best Hardwired Smart Smoke and CO Alarm

Best overall smart alarm

Why we like it

• Names both UL 217 and UL 2034
• Silence a false alarm from your phone
• One smart unit relays the whole hardwired set
• AA battery backup during outages

Kidde 30CUAR-W — hardwired + AA backup, smoke + CO, Kidde app, phone hush, voice alerts, UL 217 / UL 2034 / FCC named

One of Only Two Smart Combos Here That Name UL 2034 for CO

Six listings on this shelf detect both smoke and CO. Only two of them name UL 2034, the CO alarm standard: this Kidde 30CUAR-W and the non-smart X-Sense XP0H-WN. The two Ring-enabled Kidde combos name UL 217 and FCC, and the First Alert SC5 listings name no standard at all. The CPSC recommends installing a CO alarm that meets the current UL 2034 standard, so for a smart combo, a listing that names it is the safer buy.

The practical features fit a household that already has hardwired alarms. Kidde says adding one smart alarm gives you phone alerts for every hardwired alarm in the home, so you do not have to replace every unit at once. You can also hush a cooking false alarm from your phone rather than climbing on a chair, which the USFA says is far better than pulling the battery.

The limits: it needs an existing hardwired circuit, its whole-home relay depends on Kidde’s own interconnect, and it uses 2.4 GHz Wi-Fi. The USFA says only qualified electricians should install hardwired smoke alarms.

Check Kidde 30CUAR-W price on Amazon

2. Kidde RGCUDR-RW (Ring) — Best Battery Smart Combo With No Wiring

Best battery smart combo

Why we like it

• No wiring, runs on two AA batteries
• Ring app alerts with no subscription
• Wire-free interconnect with other Kidde alarms
• Mobile alerts for low CO levels

Kidde RGCUDR-RW — 2x AA, smoke + CO, Ring app (no plan for alerts), optional monitoring, wire-free interconnect, UL 217 / FCC

The Only Smart Combo Here That Installs With No Wiring and Adds Optional Monitoring

Four listings on the shelf work with the Ring app, and this RGCUDR-RW is the only one that combines smoke and CO detection with battery power, so it goes on any ceiling with two screws. Ring alerts for smoke, CO and low battery need no subscription, and Ring sells an optional 24/7 monitoring plan for those who want a call center watching. No other brand on the shelf mentions professional monitoring.

Wire-free interconnect is the other strength for older homes without hardwired alarms. NFPA says interconnection can be done with hard-wiring or wireless technology and that interconnected alarms should come from the same manufacturer, which fits here: the interconnect works with other Kidde alarms.

The caution is the same one we flagged on the hardwired Ring model in our CO roundup: the listing names UL 217 and FCC but not UL 2034. Confirm the CO certification on the box before treating it as your CO alarm. AA cells also need replacing, unlike sealed 10-year batteries.

Check Kidde RGCUDR-RW (Ring) price on Amazon

3. Heiman S1-R 6-Pack + Gateway — Best Whole-Home Battery Kit

Best whole-home kit

Why we like it

• Six alarms plus gateway in one box
• Interconnects even without Wi-Fi
• 10-year battery, no yearly swaps
• Names UL 217 10th Edition and CSFM
• End-of-life warnings stated

Heiman S1-R kit — 6 photoelectric alarms + gateway, 10-yr CR123A, local RF interconnect to 24, UL 217 10th / CSFM, 10-yr warranty

The Only Kit Here That Keeps Interconnecting if the Wi-Fi Goes Down

Most smart alarms here rely on Wi-Fi or a hub for their smart features. The Heiman S1-R listing describes two layers: the alarms interconnect directly with each other by radio, so when one detects smoke they all sound even without Wi-Fi, and the gateway adds phone alerts on top. That separation matters, because the fire safety job keeps working if the router is down.

It is also the only multi-alarm smart kit on the shelf, with six alarms and a gateway, and it names UL 217 10th Edition, the most specific smoke standard edition stated here alongside its Matter sibling. The 10-year sealed battery removes yearly battery changes; NFPA says to replace the whole alarm right away if a 10-year battery alarm chirps low.

One wording issue: the listing calls the dual-beam photoelectric sensor a “dual sensor” detector. That is not the same as the dual-sensor alarms the USFA describes, which combine ionization and photoelectric sensors. The S1-R is photoelectric only. For the tradeoffs, see our guide to ionization vs photoelectric smoke detectors.

Check Heiman S1-R 6-Pack + Gateway price on Amazon

4. First Alert SC5 Hardwire — Best for Replacing a Nest Protect

Best Nest Protect replacement

Why we like it

• Works alongside existing Nest Protect alarms
• Voice says the danger and the room
• Quick Connect plug, no rewiring
• Battery backup during outages

First Alert SC5 hardwire (SMCO600NV-AC) — smoke + CO, app alerts, Nest Protect compatible, voice location alerts, Quick Connect

The Only Listing That States Nest Protect Compatibility

Homes that installed Google Nest Protect alarms years ago face a replacement question as those units age. The two First Alert SC5 listings, battery and hardwired, are the only ones on the shelf that state compatibility with Nest Protect, which makes the hardwired SC5 the natural pick for swapping one unit at a time.

Its voice alerts are the most descriptive stated here: the Heads-Up warning says what the danger is and where it is in the home. A half-awake household benefits from hearing “smoke in the basement” instead of a generic siren. The Quick Connect Plug is meant to speed replacements without rewiring.

The gap is certification wording. The listing does not name UL 217 or UL 2034. NFPA advises choosing alarms that carry the label of a recognized testing laboratory, so check the back of the alarm or the box for the listing mark before installing.

Check First Alert SC5 Hardwire price on Amazon

5. Heiman S1-TM Matter — Best for Apple Home and Matter Smart Homes

Best for Matter smart homes

Why we like it

• Works with Apple Home, Google Home and Alexa
• Runs local automations with no Wi-Fi
• Adds temperature and humidity readings
• Names UL 217 10th Edition

Heiman S1-TM — Matter over Thread, photoelectric + temp/humidity, battery, UL 217 10th / CSFM, needs Thread Border Router

The Only Smart Smoke Alarm Here With a Built-In Climate Sensor

Two Heiman listings run on Matter over Thread, which lets the alarm join Apple Home, Google Home, Alexa and other platforms without its own Wi-Fi connection. The S1-TM is the one that adds a temperature and humidity sensor, readable remotely in the app, which is handy for a vacation home where a furnace failure or a humid basement is the worry.

Matter has a hard requirement the listing states clearly: you need a compatible hub with a Thread Border Router, such as recent HomePod, Nest Hub or Echo models named in the listing. Without one, the smart features do not work. The listing also mentions using the alarm to trigger offline routines, such as turning on lights.

It is smoke only, with no CO sensor, and the listing does not describe interconnect between multiple S1-TM alarms or state battery life.

Check Heiman S1-TM Matter price on Amazon

6. Kidde 20SAR-W — Best Hardwired Smoke-Only Smart Alarm

Best hardwired smoke-only

Why we like it

• States a 10-year end-of-life alarm
• Hush false alarms from the phone
• Relays alerts for other hardwired alarms
• Names UL 217 8th and 9th Editions

Kidde 20SAR-W — hardwired + AA, smoke only, Kidde app, phone hush, 10-year end-of-life alarm, UL 217 8th / 9th Ed.

The Only Smart Listing That Spells Out a 10-Year End-of-Life Alarm

Smoke alarms wear out. The USFA says to replace hardwired smoke alarms every 10 years, and many homeowners forget when theirs went up. The 20SAR-W is the only smart listing on the shelf that describes an end-of-life alarm, beeping 10 years after it is powered on. The Heiman S1-R mentions life-end warnings without a timeline.

It is the smoke-only sibling of our top pick and shares its whole-home trick: one smart unit relays phone alerts from the other hardwired alarms on the circuit. For a home that already has CO alarms elsewhere, it is a lower-cost way to make an existing hardwired smoke system smart.

The listing names the 8th and 9th Editions of UL 217 rather than the current 10th that Heiman names, and it detects smoke only. Our hardwired smoke detector guide covers compatibility with existing wiring.

Check Kidde 20SAR-W price on Amazon

Two listings we set aside

The X-Sense XP0H-WN three-pack is a solid interconnected smoke and CO combo that names UL 217 and UL 2034 and uses a sealed 10-year battery, but its listing states it has no Wi-Fi and cannot connect to a base station, so it does not send phone alerts. The Kidde COPDW is a smart plug-in CO alarm with app alerts, a backlit display and UL 2034 5th Edition named, but it detects CO only. Both are good products for different jobs; neither is a smart smoke alarm.

How smart smoke alarms connect

Direct Wi-Fi

The Kidde and First Alert models connect to your home Wi-Fi, usually 2.4 GHz, and send alerts through the brand’s app. Simple, but smart alerts stop if the router or internet is down. The alarm itself still sounds.

Gateway or hub

The Heiman S1-R uses a gateway that talks to the alarms by radio and to your network by Wi-Fi. The alarms keep interconnecting even if the gateway or Wi-Fi fails.

Matter over Thread

The Heiman Matter models join a Thread network through a border router, and then show up in Apple Home, Google Home or Alexa. Good for mixed-platform homes, but you must already own a compatible hub.

Whatever the connection, the alarm’s local siren is the core safety function, and app alerts are a bonus. The USFA notes that when a smoke alarm sounds, you may have less than two minutes to get everyone outside.

Interconnection: the feature that matters most

The USFA and NFPA both recommend interconnected smoke alarms, so when one sounds they all sound. NFPA adds that interconnection can be hardwired or wireless and that interconnected alarms should be from the same manufacturer, since incompatible alarms may not work together. That has a practical consequence for smart alarms: plan to stay within one brand’s family. A Kidde smart alarm relays other Kidde alarms; a First Alert SC5 interconnects with compatible First Alert and Nest Protect alarms; Heiman alarms interconnect with Heiman.

Our guide to interconnected smoke detectors goes deeper on wired versus wireless links.

Reading UL 217 and certification wording

UL 217 is the standard for residential smoke alarms, and UL 2034 covers CO alarms. NFPA’s advice is to choose alarms that carry the label of a recognized testing laboratory, and the CPSC recommends CO alarms that meet the current UL 2034 standard. Listing wording on this shelf varies widely:

• Ten of the 13 listings name UL 217 in some form. The two First Alert SC5 listings and the CO-only Kidde COPDW do not.
• Of the six smoke-and-CO combos, only the Kidde 30CUAR-W and the X-Sense name UL 2034.
• Specific editions appear on the Heiman listings (UL 217 10th) and the Kidde 20SAR-W (8th and 9th).

Vague wording does not prove a product lacks a listing, but confirm the mark on the alarm or the packaging before you install it.

Placement, power and replacement

NFPA says to install smoke alarms inside each bedroom, outside each sleeping area and on every level, including the basement, and on levels without bedrooms in the living room or near the stairway. The USFA adds that alarms belong on the ceiling or high on the wall. Our smoke detector placement guide covers distances from kitchens and bathrooms, which matters because steam and cooking cause most nuisance alarms.

Test every alarm monthly, smart or not. The USFA advises replacing 9-volt batteries at least yearly, replacing hardwired backup batteries yearly and replacing hardwired and 9-volt alarms every 10 years, while 10-year lithium alarms are replaced per the manufacturer’s instructions. If an alarm starts chirping, our smoke detector chirping guide explains what the patterns mean.

For CO alarms in combos, the CDC advises installing battery-operated or battery-backup CO detectors near every sleeping area and replacing them per the manufacturer’s instructions. Front Range homes with gas furnaces, gas water heaters and attached garages should have CO coverage on every level.

Subscriptions and privacy

None of the picks requires a subscription for phone alerts. Ring sells optional 24/7 monitoring for its Kidde alarms. Smart alarms do create an account and a data trail with the brand; review the app’s privacy settings and use a strong password. We report what the listings state about apps and have not verified any brand’s data practices.

When to call a professional

Hire an electrician for any new hardwired alarm circuit, and for replacements where the existing wiring is old, damaged or a different brand’s connector. If an alarm sounds and you cannot find a source, or a CO alarm activates, get everyone out and call for help from outside. A home inspection checks alarm coverage, age and placement, which is useful when buying an older house. See our home inspection tools pillar for more, and Front Range buyers and owners can reach a vetted local inspector through our contact page.

References

• Installing and Maintaining Smoke Alarms — National Fire Protection Association
• Smoke Alarms — U.S. Fire Administration
• Carbon Monoxide Questions and Answers — U.S. Consumer Product Safety Commission
• Carbon Monoxide Poisoning Basics — Centers for Disease Control and Prevention