The 10 Best Smart Smoke and CO Detectors

Wi-Fi smoke and carbon monoxide alarms that alert your phone, ranked from live Amazon data.

We pulled the smart smoke and CO alarms selling on Amazon and scored them on rating, review volume, and features: CO detection, interconnection, and hardwired or 10-year battery power. Some kits use their own radio to a Wi-Fi base station; the table shows which.

Prices, ratings, and review counts captured from Amazon on 2026-10-04.

Our picks

Best Overall

Kidde

Kidde Smart Smoke + CO with Ring (RGCUDR)

4.3 (465)

Smoke and CO with Ring app alerts and no subscription required, 3K+ bought last month.

Kidde Smart Smoke with Ring (RGSDR)

4.3 (232)

A $49.98 smart smoke alarm with wire-free interconnection and Ring alerts.

Kidde Smart Smoke + CO with Ring, hardwired (RGCUAR)

4.1 (423)

Replaces a hardwired alarm and sends phone alerts for every hardwired alarm in the house.

Heiman S1-R 6-pack + gateway

4.1 (36)

Six interconnected 10-year alarms and a gateway for app alerts.

$175.99

View on Amazon →

Side-by-side

Swipe the table sideways to see every column.

#	Alarm	Price	Rating	Reviews	Works with	Detects	Power	Connects via	Score
1	Kidde Smart Smoke + CO with Ring (RGCUDR)	$69.97	4.3	465		Smoke and CO	2 AA batteries	Wi-Fi (Ring app)	80
2	Kidde Smart Smoke + CO with Ring, hardwired (RGCUAR)	$59.80	4.1	423		Smoke and CO	Hardwired + AA backup	Wi-Fi (Ring app)	78
3	Kidde Hardwired smart smoke + CO (Kidde app)	$74.97	3.7	211	Kidde app	Smoke and CO	Hardwired + AA backup	Wi-Fi (Kidde app)	72
4	First Alert SC5 (battery)	$125.14	3.1	624	First Alert app	Smoke and CO	Battery	Wi-Fi (First Alert app)	71
5	Kidde Smart Smoke with Ring (RGSDR)	$49.98	4.3	232		Smoke	2 AA batteries	Wi-Fi (Ring app)	70
6	Kidde Smart Smoke with Ring, hardwired (RGSAR)	$54.98	4.2	228		Smoke	Hardwired + AA backup	Wi-Fi (Ring app)	69
7	Kidde Smart CO + indoor air quality (COPDLQW)	$79.97	4.4	67		CO, plus humidity and TVOC	Plug-in + AA backup	Wi-Fi (Kidde app)	68
8	eufy Smoke Alarm E10	$49.99	4.4	234	eufy Security (HomeBase)	Smoke	5-year sealed battery	eufy HomeBase	64
9	Kidde Hardwired smart smoke (Kidde app)	$54.97	3.8	113	Kidde app	Smoke	Hardwired + AA backup	Wi-Fi (Kidde app)	63
10	Heiman S1-R 6-pack + gateway	$175.99	4.1	36	Heiman app	Smoke	10-year CR123A	Wireless interconnect + Wi-Fi gateway	61
✕	Google Nest Protect (reseller, $499.99)	$499.99	4.6	4,630	Google Home / Nest app	Discontinued alarm at about four times its old price			AVOID

Works with: hover or tap an icon for the system name. A system is shown when it supports the product directly or through the hub the listing requires.

The full ranking

Scored out of 100: 45% customer rating, 30% review volume, 25% features.

Best Overall

Kidde

Kidde Smart Smoke & CO Detector with Ring, AA Battery, RGCUDR-RW

4.3 465 reviews

Score 80/100

$69.97

Check price on Amazon

3K+ bought in past month

The best smart alarm for most homes: smoke and CO, phone alerts without a subscription, and wire-free interconnection.

Detects: Smoke and CO
Power: 2 AA batteries
How it connects: Wi-Fi (Ring app)
Extras: Wire-free interconnect, optional $5/mo monitoring

Pros

Smoke and CO
Ring app alerts with no subscription
Wire-free interconnection with other Kidde alarms
3K+ bought in the past month, sold by Amazon

Cons

AA batteries need replacing
24/7 monitoring is $5 a month
4.3 stars

Best Hardwired

Kidde

Kidde Smart Smoke & CO Detector with Ring, Hardwire & AA Battery, RGCUAR-RW

4.1 423 reviews

Score 78/100

$59.80

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2K+ bought in past month

Swap one hardwired alarm for this and you get phone alerts from every hardwired alarm in the house.

Detects: Smoke and CO
Power: Hardwired + AA backup
How it connects: Wi-Fi (Ring app)
Extras: Smart alerts for all hardwired alarms

Pros

Smoke and CO
One unit makes the whole hardwired system alert your phone
2K+ bought in the past month

Cons

Needs existing alarm wiring
4.1 stars
Monitoring is extra

Kidde

Kidde Hardwired Kidde App Enabled Smart Smoke and Carbon Monoxide Detector, AA Battery Backup, Voice Alerts, Interconnected Alarm

3.7 211 reviews

Score 72/100

$74.97

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1K+ bought in past month

Kidde's own-app hardwired combo alarm, with voice alerts and hushing from your phone.

Detects: Smoke and CO
Power: Hardwired + AA backup
How it connects: Wi-Fi (Kidde app)
Extras: Voice alerts, hush from phone

Pros

UL 217 and UL 2034
Hush false alarms from your phone
Voice alerts

Cons

3.7 stars
$74.97
Voice assistants aren't named

First Alert

First Alert SC5 Battery Smart Smoke & Carbon Monoxide Alarm

3.1 624 reviews

Score 71/100

$125.14

Check price on Amazon

1K+ bought in past month

The Nest Protect's successor, with voice location alerts, but reviews have been rough.

Detects: Smoke and CO
Power: Battery
How it connects: Wi-Fi (First Alert app)
Extras: Voice location alerts, works with Nest Protect

Pros

Smoke and CO
Interconnects with Nest Protect
Voice tells you the danger and location

Cons

3.1 stars
$125.14
Battery type isn't in the bullets

Best Budget

Kidde

Kidde Smart Smoke Detector with Ring, AA Battery, RGSDR-RW

4.3 232 reviews

Score 70/100

$49.98

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1K+ bought in past month

The smoke-only version, for bedrooms and rooms without gas appliances.

Detects: Smoke
Power: 2 AA batteries
How it connects: Wi-Fi (Ring app)
Extras: Fewer cooking false alarms

Pros

$49.98
Ring app alerts, no subscription
Wire-free interconnection

Cons

No CO
AA batteries
Only 232 reviews

Kidde

Kidde Smart Smoke Detector with Ring, Hardwire & AA Battery, RGSAR-RW

4.2 228 reviews

Score 69/100

$54.98

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500+ bought in past month

The smoke-only hardwired Ring model, with Alexa notifications.

Detects: Smoke
Power: Hardwired + AA backup
How it connects: Wi-Fi (Ring app)
Extras: Alexa notifications

Pros

Alerts for every hardwired alarm
Alexa notifications
$54.98

Cons

No CO
Needs alarm wiring
Only 228 reviews

Kidde

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

4.4 67 reviews

Score 68/100

$79.97

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500+ bought in past month

A plug-in CO alarm that also tracks air quality and warns about low CO levels.

Detects: CO, plus humidity and TVOC
Power: Plug-in + AA backup
How it connects: Wi-Fi (Kidde app)
Extras: Low-level CO alerts from 30 ppm

Pros

Alerts at low CO levels
Air quality, humidity, and TVOC
Alexa and Google Home
UL 2034

Cons

No smoke detection
Only 67 reviews
Some insights need a subscription

eufy

eufy Security Smoke Alarm E10, Smoke Detector, Ultra-Compact 70 mm Design

4.4 234 reviews

Score 64/100

$49.99

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300+ bought in past month

A tiny smoke alarm for homes that already run eufy cameras and a HomeBase.

Detects: Smoke
Power: 5-year sealed battery
How it connects: eufy HomeBase
Extras: 70 mm compact design

Pros

Very compact
5-year sealed battery
UL 217 10th edition
4.4 stars

Cons

Requires a eufy HomeBase
Smoke only
Only 234 reviews

Kidde

Kidde Hardwired Kidde App Enabled Smart Smoke Detector with AA Backup Battery, Interconnected Alarm

3.8 113 reviews

Score 63/100

$54.97

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300+ bought in past month

The smoke-only Kidde-app hardwired alarm.

Detects: Smoke
Power: Hardwired + AA backup
How it connects: Wi-Fi (Kidde app)
Extras: Hush button

Pros

Alerts for every hardwired alarm
Everything in the box
$54.97

Cons

3.8 stars
No CO
Only 113 reviews

#10

Best Whole-Home Kit

Heiman

Heiman Smart Wireless Interconnected Smoke Detector, 6-Pack + Gateway, S1-R

4.1 36 reviews

Score 61/100

$175.99

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200+ bought in past month

Six small interconnected alarms with 10-year batteries and a gateway for phone alerts.

Detects: Smoke
Power: 10-year CR123A
How it connects: Wireless interconnect + Wi-Fi gateway
Extras: UL 217 10th edition, 85 dB

Pros

6 alarms and a gateway
10-year battery
Interconnects even without Wi-Fi
UL 217 10th edition

Cons

Smoke only
Only 36 reviews
$175.99

The one to avoid

This alarm turns up in the search results but has problems serious enough that we'd keep looking.

✕ Avoid

Google

Google Nest Protect - Smoke Alarm - Smoke Detector and Carbon Monoxide Detector - Wired, White

4.6 4,630 reviews · $499.99

The Nest Protect was a great alarm, but Google stopped making it in 2025, and this reseller wants $499.99 for one.

Why we'd skip it

Sold by a third-party reseller at $499.99, about four times Google's last retail price.
Google discontinued the Nest Protect in 2025 and points buyers to First Alert's SC5 instead.
Smoke alarms expire after about 10 years, and the listing doesn't give a manufacture date.

See the listing on Amazon (so you recognize it)

Buyer's guide

Smoke only, or smoke and CO?

Put a combination smoke and carbon monoxide alarm on every level and outside sleeping areas if your home has gas appliances, a fireplace, or an attached garage. Smoke-only alarms are fine inside bedrooms.

Does a smart alarm replace a regular one?

Only if it's UL listed as a smoke alarm. A smart alarm adds phone alerts and interconnection, but the local siren is what wakes you up. Check the listing for UL 217 (smoke) and UL 2034 (CO).

Hardwired or battery?

If your home has hardwired alarms, replace them with hardwired smart alarms so they stay interconnected and code compliant. Battery models suit homes without wiring, and 10-year sealed batteries mean no yearly battery swaps.

Smoke and CO detectors on other protocols

Matter smoke and CO alarms →

The 10 Best Smart Smoke and CO Detectors

Our picks

Side-by-side

The full ranking

Kidde Smart Smoke & CO Detector with Ring, AA Battery, RGCUDR-RW

Pros

Cons

Kidde Smart Smoke & CO Detector with Ring, Hardwire & AA Battery, RGCUAR-RW

Pros

Cons

Kidde Hardwired Kidde App Enabled Smart Smoke and Carbon Monoxide Detector, AA Battery Backup, Voice Alerts, Interconnected Alarm

Pros

Cons

First Alert SC5 Battery Smart Smoke & Carbon Monoxide Alarm

Pros

Cons

Kidde Smart Smoke Detector with Ring, AA Battery, RGSDR-RW

Pros

Cons

Kidde Smart Smoke Detector with Ring, Hardwire & AA Battery, RGSAR-RW

Pros

Cons

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

Pros

Cons

eufy Security Smoke Alarm E10, Smoke Detector, Ultra-Compact 70 mm Design

Pros

Cons

Kidde Hardwired Kidde App Enabled Smart Smoke Detector with AA Backup Battery, Interconnected Alarm

Pros

Cons

Heiman Smart Wireless Interconnected Smoke Detector, 6-Pack + Gateway, S1-R

Pros

Cons

The one to avoid

Google Nest Protect - Smoke Alarm - Smoke Detector and Carbon Monoxide Detector - Wired, White

Why we'd skip it

Buyer's guide

More Wi-Fi reviews

Smoke and CO detectors on other protocols