What are smart home devices? The types, with examples
A smart home device is any household device you can control or automate over a network. The interesting part is not what it does but how it connects, because that decides what else you have to buy.
Smart home devices are household devices you can control or automate over a network: plugs, bulbs, locks, thermostats, cameras and sensors. What separates them is the network they use, which decides whether they need a hub and whether they keep working when the internet drops.
The twelve types, explained simply
Every smart home device on sale fits one of these twelve jobs. The example is the pick this site recommends first in each category, and each row links to the full category page.
| Type | What it does | Usual network | Example on this site |
|---|---|---|---|
| Hubs & Bridges | The box that makes everything else talk to each other | Thread, Zigbee, Matter | Aqara Hub M3 |
| Speakers & Displays | Voice control, timers, and a screen in the kitchen | Wi-Fi | Amazon Echo Dot (5th Gen) |
| Smart Plugs | The cheapest way to make a dumb appliance smart | Wi-Fi or Thread | TP-Link Tapo P110M |
| Lighting | Bulbs, strips and dimmers, by how you actually switch them | Zigbee, Thread or Wi-Fi | Philips Hue Starter Kit |
| Thermostats | The smart device most likely to pay for itself | Wi-Fi | Nest Learning Thermostat (4th Gen) |
| Video Doorbells | Who is at the door, and what they left | Wi-Fi | Ring Battery Doorbell Pro |
| Smart Locks | Keyless entry without losing the keyhole | Thread, Wi-Fi or Bluetooth | Aqara Smart Lock U400 |
| Security Cameras | Indoor and outdoor, subscription or not | Wi-Fi | TP-Link Tapo C120 |
| Robot Vacuums | Floors that clean themselves, mostly | Wi-Fi | Roborock Q Revo |
| Sensors | Motion, contact and leak — the cheap parts that do the work | Zigbee or Thread | Aqara Motion & Contact Sensors |
| Blinds & Curtains | Retrofit motors versus whole new blinds | Bluetooth or Zigbee | SwitchBot Curtain 3 |
| Water & Safety | Leak shutoff, smoke, and the stuff insurance cares about | Zigbee | Aqara Smart Valve Controller T1 |
What makes a device smart
Three things, and a device needs all of them. It has a radio, so it can be reached. It has software that accepts commands from an app, a voice assistant or another device. And it can act on its own, on a schedule or because a sensor told it to.
That third part is the one people underrate. A lamp you can turn off from your phone is a remote control with extra steps. A lamp that turns off at midnight because nobody is in the room is a smart home.
How the devices talk to each other
Five words cover almost every device on sale: Matter, Thread, Zigbee, Wi-Fi and Z-Wave. Wi-Fi devices join your router and need nothing else. Thread and Zigbee devices join a low-power mesh run by a hub or border router, and keep working locally when the broadband drops. Matter is the shared language that lets one device appear in Alexa, Google Home, Apple Home and SmartThings at once.
Some devices use Bluetooth or a maker's own radio and reach your platform through a bridge. This site tags every product with its network so the hidden extra is visible before you buy. The protocol comparison goes through each one.
A list of everyday examples
- A floor lamp on a smart plug that turns on at sunset and off at midnight.
- A motion sensor in the hallway that turns the lights on at low brightness after 11 pm.
- A thermostat that lowers the heat when the last phone leaves the house.
- A leak sensor under the washer that closes the water valve and sends an alert.
- A video doorbell that shows the parcel on the step while you are at work.
- A robot vacuum that cleans while the house is empty and empties itself afterward.
Smart appliances are a different conversation
Washing machines, fridges and ovens increasingly come with apps. They are smart appliances rather than smart home devices in the sense used here: you buy them for the appliance, and the app is a bonus that rarely joins the rest of the house. Robot vacuums are the exception that behaves like a smart home device, which is why they have a category of their own.
Questions people ask
What is the most common smart home device?
Do smart home devices need Wi-Fi?
Are smart home devices safe?
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Quiet SwitchOne person, no sponsors, no devices owned. Specs come from maker documentation and the live listing; nothing here is written as though it had been tested in this house. How this site works →