A smoke detector that does not connect to anything is still better than nothing – but when you travel or spend time away from home, you get zero warning about problems until you walk back in. Smart smoke detectors fix that. The question is which one is worth the price premium over a $15 unit from the hardware store.
Three options worth considering in 2026: Nest Protect (the gold standard, and the most expensive), Kidde Smart (the practical budget choice), and First Alert Onelink Safe & Sound (the pick if you want Alexa built in).
Quick Picks
- Best overall: Nest Protect – self-testing, pathlight feature, excellent app alerts
- Best budget: Kidde Smart Smoke + CO – Wi-Fi connected, no hub, low cost
- Best with built-in speaker: First Alert Onelink Safe & Sound – Alexa inside, HomeKit compatible
Nest Protect
The Nest Protect is still the benchmark for smart smoke detectors, and it is not particularly close. It detects both smoke and carbon monoxide, runs self-tests automatically every month so you are not relying on the low-battery chirp as your only indication it is working, and it announces which room the alarm is detecting in – useful when you are half asleep and trying to figure out whether it is an actual fire or the kitchen again.
The Pathlight feature turns the device into a soft nightlight when you walk under it at night, which is a small but genuinely useful detail. App alerts work well. If you have multiple Nest Protects, they communicate with each other so an alert in one room triggers all of them.
Available in battery and wired versions. The battery version installs anywhere with no electrician required. It works with the Google Home ecosystem. The price is high – around $119 per unit – but for whole-home coverage, the self-testing and app alerts justify it.
Kidde Smart Smoke + CO Alarm
Kidde is one of the oldest names in smoke detection, and their Smart Smoke + CO Alarm is the straightforward Wi-Fi-connected option for people who do not want to spend Nest Protect money. No hub required – it connects directly to your home Wi-Fi and sends push notifications through the Kidde app if it detects smoke or CO while you are out.
Battery-powered means it installs anywhere – no wiring, no electrician. The app alerts are functional if basic. You lose the multi-device communication and self-testing that make the Nest Protect impressive, but for a single-unit installation in a rental or a room where you want coverage without complexity, it does the job at a fraction of the price.
Works on 2.4GHz Wi-Fi only, which matters if you have a newer router that does not broadcast a 2.4GHz network separately. Check before buying.
First Alert Onelink Safe & Sound
The First Alert Onelink Safe & Sound does something none of the other detectors on this list do: it has a full Amazon Alexa speaker built in. That means it doubles as an Echo device – you can ask it questions, play music, control other smart home devices, all while it is also monitoring for smoke and CO. Apple HomeKit compatible as well.
It is hardwired, which means an electrician visit or DIY electrical work if you are replacing a battery unit. The battery backup means it continues working during a power outage. Interconnects with other First Alert Onelink devices wirelessly.
The appeal here is consolidation – one device on the ceiling that handles safety monitoring and smart speaker duty. It makes particular sense for rooms where you already wanted an Echo but did not want two separate ceiling devices. The build quality is better than the price suggests.
The Bottom Line
If you are building out whole-home coverage and want the best system, Nest Protect is worth the price. The self-testing, room announcements, and device-to-device communication are features that matter when something actually happens.
If you want basic smart connectivity at a normal price, the Kidde Smart does what it needs to do without requiring you to spend $120 per room. Battery-powered install is genuinely convenient.
The First Alert Onelink is the interesting edge case – a legitimate smart speaker that also happens to be a safety device. If the Alexa integration is useful to you and you are replacing a hardwired unit anyway, it makes sense.