Do smart smoke detectors need a hub?

Most do not. Units like the First Alert Onelink Safe and Sound, Google Nest Protect and X-Sense XS01-WT connect directly to Wi-Fi.

Should I buy a combination smoke and carbon monoxide alarm?

In most cases yes. Combination units cover both hazards from one ceiling position and one app.

How long do smart smoke detectors last?

Almost every alarm carries a ten-year replacement date printed on the unit. Carbon monoxide sensors often expire sooner.

The Best Smart Smoke Detectors of 2026

The best smart smoke detector in 2026 does one thing a traditional alarm cannot: it tells you there is a fire when you are not home. Beyond the phone alert, the differences that matter are whether the unit also detects carbon monoxide, whether alarms interconnect so every device sounds at once, and whether it needs a hub or subscription. Here are the six alarms we recommend.

How we ranked them

Every pick is a UL-listed alarm first and a smart device second. We ranked on combined smoke and carbon monoxide detection, sensor type (photoelectric, ionisation or dual), whether units interconnect wirelessly so one alarm triggers all, phone alert reliability, hub and subscription requirements, hardwired versus battery installation, expected sensor lifespan, and integration with Alexa, Google Home, HomeKit and Matter.

Fire is only half the story, so read this alongside our best carbon monoxide detector guide, and treat alarms as one layer of a wider setup covering best home security systems and the rest of your smart home devices.

What each alarm is best for

First Alert Onelink Safe & Sound — Best overall: A ceiling-mounted combination smoke and CO alarm with a full-range speaker and Alexa built in, so it doubles as a smart speaker. Location-specific voice alerts tell you which room is affected.
Google Nest Protect — Best app and alerts: Split-spectrum sensing, spoken alerts, a nightlight and the best-designed app in the category. Still the benchmark for how a smart alarm should communicate.
X-Sense XS01-WT — Best value: The value pick. Wi-Fi connected, interconnects with other X-Sense units, ten-year sealed battery and no subscription. Smoke only, so pair it with a separate CO alarm.
Kidde Smart Smoke and CO Alarm — Hardwired replacement: Combination detection with hardwired and battery options and straightforward app alerts. A sensible replacement for existing hardwired Kidde units.
Ring Alarm Smoke and CO Listener — Retrofitting existing alarms: Not a detector at all: it listens for your existing alarms and pushes a notification. The cheapest way to make dumb alarms smart if they are still in date.
SimpliSafe Smoke Detector — SimpliSafe households: Integrates with the SimpliSafe security system and its monitoring plans, which can dispatch the fire service. The right choice only if you already run SimpliSafe.

The verdict

For most homes the First Alert Onelink Safe & Sound is the best smart smoke detector of 2026: it covers both smoke and carbon monoxide, works with Alexa and HomeKit, and the built-in speaker earns its place on the ceiling. The Google Nest Protect is the better pick if app quality and spoken alerts matter most. If you need coverage across several rooms without a large outlay, buy multiple X-Sense XS01-WT units and add a dedicated CO alarm alongside them.