Matter vs Zigbee: which should you buy?

Zigbee and Matter get put head to head constantly, and the comparison doesn't hold. Zigbee is a radio and the network stack that runs on it. Matter is an application layer, a shared language devices speak once they are already on a network. Matter runs over Wi-Fi, over Thread and over Ethernet. It does not run over Zigbee.

So this is not a choice between two competing radios, and the spec table everyone reaches for answers nothing. Does buying Matter mean throwing out the Zigbee gear already on the wall? What happens to a Zigbee device when you push it into an ecosystem through Matter? Which should you be buying in Australia today? Those are answerable.

What each one actually is

Zigbee uses the IEEE 802.15.4 radio in the 2.4 GHz band, across 16 channels numbered 11 to 26. Devices form a mesh: one coordinator starts the network, mains-powered devices route traffic for everything else, and battery devices sleep between reports and route nothing. Zigbee devices are not IP addressable. That single fact is why a Zigbee network always needs a hub to reach anything else in the house.

Matter has no radio of its own. It sits on top of ordinary IP networking, so every Matter device is a Wi-Fi device, an Ethernet device or a Thread device. Thread is the one people confuse with Zigbee, understandably: it uses the same 802.15.4 radio at 2.4 GHz. The difference is that Thread carries IPv6, so a Thread device is addressable on your network and Matter can talk to it directly. A Zigbee device can't be.

No, you don't have to replace your Zigbee gear

This is the question underneath most searches for "matter vs zigbee", and the answer is no.

A Matter bridge is a hub that joins your Matter network as a single device, then presents everything on its Zigbee mesh as individual Matter devices. Apple Home, Google Home and Alexa see lights and sensors; the bridge does the translating in the middle. The Philips Hue Bridge, Aqara's hubs and IKEA's Dirigera all work this way, and all three are sold in Australia. If you own one already, you almost certainly own the bridge you need, and turning it on costs nothing.

Two things to know before you count on that. SmartThings hubs run Zigbee devices inside SmartThings and act as Matter controllers, but they don't publish those Zigbee devices back out to other ecosystems as Matter. And Home Assistant is a Matter controller, not a bridge: on its own it can't turn the Zigbee devices it already manages into Matter devices for Apple Home. Community add-ons do it, nothing official does.

What a bridged device loses

Matter only carries what the specification has defined. A bridge maps each Zigbee device to the closest Matter device type it can find, and whatever has no match doesn't come across.

For a light that usually means on, off, brightness and colour arrive intact, and the manufacturer's own tricks don't. Home Assistant's documentation is blunt about it: bridging Hue over Matter gives you basic control of the lights, while the native Hue integration gives you dynamic scenes and entertainment mode. Bridging that particular pair loses you features rather than adding any.

The gaps get stranger than that. Home Assistant notes that the SwitchBot Hub 2 bridges curtains, locks and blinds over Matter, but not lights. Sensitivity settings, diagnostics, vendor scene engines and unusual device categories generally stay behind in the manufacturer's app.

None of it is deleted. It is all still there in the app the device shipped with. It just isn't visible from the ecosystem you bridged into, which matters if the whole point was to run the house from one app.

When Zigbee is still the right buy here

Battery sensors are the clearest case. A Zigbee door or motion sensor sleeps with its radio off and wakes briefly to report, so a coin cell lasts years. Matter over Wi-Fi is still Wi-Fi and won't get close. Matter over Thread is the honest competitor here, but the Thread catalogue is narrower and dearer.

Price and breadth are the next. The Zigbee catalogue is bigger and cheaper, particularly at the sensor end, and it is still growing. Aqara and Sonoff both released new Zigbee 3.0 gear this year. IKEA is the exception worth naming: it is moving new products to Matter over Thread, while Dirigera carries on bridging the Zigbee gear people already own.

Home Assistant is the third. If that is your platform, Zigbee is the path of least resistance. You run the coordinator yourself, everything is local, and you get every attribute a device exposes rather than the subset Matter defines.

Frequency is not a reason to prefer either one. Zigbee's 2.4 GHz channels are identical in Australia to everywhere else, unlike Z-Wave, which uses different frequencies by region. What still needs checking on imported gear is 230 V mains compatibility and the RCM mark, not the radio.

Starting from scratch

Buying today on Apple Home, Google Home or Alexa: take Matter where the device is genuinely Matter, and expect a Zigbee or Thread mesh underneath it for the sensors. Some hardware makes the choice explicit. The Shelly 1 Gen4 sold here ships on a Matter profile by default with a Zigbee profile you can switch to, and it runs one or the other, not both.

Buy the device that does the job well, then check what it speaks. Most Australian homes past a dozen devices end up with both, a Zigbee hub bridged into whichever app the household actually opens.