Smart Smoke & CO Alarm

How it works

Standard detection hardware plus a Wi-Fi radio and a cloud service. When the alarm sounds it also publishes an event, and the app pushes it to your phone. Most models also interconnect with each other so the whole house sounds, and announce in speech which hazard and which room.

What the market looks like

This category went through an upheaval in 2025 when Google discontinued Nest Protect, for a decade the default recommendation, and partnered with First Alert instead. The successor First Alert smart alarm sits around CAD $170 and interconnects with existing Nest Protect units, which is unusually decent behaviour toward stranded customers. Existing Nest Protects continue to receive updates to their expiry. Beyond that the field is thinner than it was, with various smaller brands and a lot of cheap Wi-Fi units of unclear certification. Treat certification as non-negotiable here: this is a life-safety device first and a smart-home gadget second.

Features that actually matter

Push notification

The single reason to buy one. It converts a device that only shouts into the room into one that reaches you anywhere.

Voice announcement

Says whether it is smoke or CO and which room. Meaningfully better than a pattern of beeps in a panic.

App-based self-test

Reports its own health and battery state, which removes the reason people stop testing manually.

Interconnection

Links to other units of the same family so one detection sounds the house. Check compatibility before mixing product lines.

What it is not

Not monitored. Nobody is watching the app but you, and no fire department is dispatched by a push notification.

What it really costs

Up front

CAD $130-$220 per unit — roughly four times a good sealed alarm.

Consumables

Batteries on battery models.

What else you'll need

A reliable Wi-Fi signal where the alarms are, which in a basement or detached garage is not a given.

Over five years

Purchase price. Replacement at ten years from manufacture applies here too.

Figures are typical street prices in Canadian and US dollars as of September 2026, gathered from public retail listings. They move with the season and with the exchange rate — treat them as a planning band, not a quote.

How it differs from the alternatives

Versus a standard alarm

Identical protection for anyone inside the house. The entire premium buys you notification when the house is empty.

Versus professional monitoring

A smart alarm tells you. Monitoring tells the fire department. If the scenario you are buying for is an empty house, ask honestly whether a phone alert while you are four hours away is what you actually wanted.

Versus a listener

A listener costs a third as much and works with the alarms you already own, at the price of adding a second point of failure.

Platform risk is real

Nest Protect was the category leader for a decade and was discontinued. Cloud-dependent life-safety devices inherit their vendor's business decisions, which is an argument for keeping at least some conventional alarms in the house.

If not this, then what

• Smoke and CO listenerMuch cheaper, uses your existing alarms, and on Amazon Sidewalk it works without your Wi-Fi.
• Professional monitoringThe only option that dispatches anyone.
• A sealed ten-year alarmA quarter of the price and identical protection for people who are home.