Guide · Smart Home
Matter and Thread Explained
Direct answer
What Matter and Thread are, why Apple, Google, Amazon, and Samsung agreed on them, and what they mean for the smart home you install today.
Matter and Thread are the two open standards that the major technology companies agreed on for smart home devices. For the first time in twenty years, an Apple device, a Google device, an Amazon device, and a Samsung device can all talk to each other without bridges, hubs, or vendor lock-in. If you’re installing infrastructure today that needs to work in 2035, this is what you build on.
The short version
Matter is the application layer, the language that smart home devices use to describe themselves and accept commands.
Thread is the network layer, the radio protocol that lets battery-powered devices talk to each other reliably without needing Wi-Fi.
They’re often discussed together because most new Matter devices use Thread as their network. But they’re separable: you can have Matter devices that run over Wi-Fi, and you can have Thread devices that don’t speak Matter (though that’s becoming rare).
Why this matters
Before Matter, every smart home brand had its own ecosystem. Apple HomeKit, Google Home, Amazon Alexa, Samsung SmartThings: each used different protocols, different cloud services, and different rules. If you wanted a device to work with your existing system, you had to check whether it supported your specific brand. Cross-platform devices were rare and usually compromised.
The result was a market where nothing worked together cleanly, vendor lock-in was the norm, and replacing one brand of switch meant replacing everything else around it.
In 2019, Apple, Google, Amazon, and Samsung formed the Connectivity Standards Alliance and agreed to develop a single standard. Matter 1.0 launched in late 2022. As of 2026, Matter is broadly supported across all major platforms, and most new smart home devices ship with Matter compatibility.
What Matter does
Matter is a protocol that defines how a smart device introduces itself to a controller, what commands it accepts, and what state it can report. In practical terms:
- A Matter light bulb advertises itself as a “dimmable light” with on/off, brightness, and (if applicable) colour
- A Matter sensor advertises itself as a “temperature sensor” or “occupancy sensor” with the data it provides
- A Matter controller (your Home Assistant, Apple Home Hub, Google Nest Hub, etc.) recognises it and adds it to your system
The controller doesn’t need to know which brand made the device. The device doesn’t need to know which controller it’s talking to. Every Matter device works with every Matter controller, by design.
What Thread does
Thread is a low-power mesh networking protocol. It’s similar to Zigbee in concept but designed specifically for the modern smart home:
- Mesh network: devices relay signals to each other, extending the network without a central router
- Low power: battery-powered Thread devices last years on a coin cell
- Self-healing: if one device fails, the network reroutes around it
- IPv6 native: Thread devices have real IP addresses, which makes diagnostics and integration simpler
Thread requires a “border router” to connect the mesh to the rest of your network. Most modern smart home hubs include one: Apple HomePod mini, Apple TV 4K (latest gen), Amazon Echo (latest gen), Google Nest Hub (2nd gen and later), Home Assistant Yellow, and many Eero routers.
Why this combination is the right architecture
The Matter-and-Thread combination solves several problems at once:
- No vendor lock-in. Matter is governed by a non-profit alliance, not any single company. No vendor can change the protocol to break compatibility with competitors.
- No cloud dependency. Matter and Thread both run locally. You can use cloud services if you want them, but the protocols themselves don’t require any.
- Long lifespan. Both standards are designed for backward compatibility. Devices certified today are expected to keep working with controllers certified ten years from now.
- Real interoperability. Not “works with Alexa” or “Apple HomeKit compatible,” but actual standard compliance, where every Matter controller accepts every Matter device.
What this means for an install today
Iron and Air’s standard approach:
- Specify Matter-compatible devices wherever possible. This is the default for most new smart switches, plugs, sensors, and bulbs.
- Use Thread for low-power and battery devices. Sensors, locks, blinds, leak detectors. Wi-Fi is wasteful for these.
- Use Wi-Fi for high-bandwidth devices. Cameras, displays, devices that need to stream data.
- Have at least two Thread border routers in the property. Redundancy if one fails.
- Run the Home Assistant controller as the primary hub. Home Assistant supports Matter natively and stores everything locally.
You can absolutely mix Matter and non-Matter devices. Many existing devices (Zigbee, Z-Wave, Wi-Fi proprietary protocols) still have a place in a system, particularly where Matter equivalents don’t exist yet. The principle is: lead with Matter where you can, supplement where you must.
Where Matter still has gaps
Matter is mature but not complete. Some categories are still being worked out:
- Cameras and video. The Matter 1.4 spec (released in late 2024) added camera support, but adoption is slow and most cameras still use proprietary protocols. Expect this to change over 2026–2027.
- Energy management. Matter has a basic energy management profile, but advanced features (dynamic load shedding, time-of-use optimisation) still need vendor-specific integrations.
- Multi-controller setups. Matter supports multiple controllers (“Multi-Admin”), but there are still edge cases where switching between Apple Home and Home Assistant control loses some device features.
- Whole-home audio. Not currently in Matter at all; still vendor-specific (Sonos, AirPlay, Chromecast).
These gaps are filled by either using non-Matter devices alongside Matter, or by waiting for the next Matter spec release. Iron and Air doesn’t recommend forcing a Matter-only architecture today if it means compromising on functionality you actually need.
Common questions
Should I rip out my existing Zigbee devices and replace them with Matter? No. If they’re working, leave them. Most Zigbee devices will continue to be supported in Home Assistant indefinitely. Replacing them with Matter equivalents adds cost without benefit. Replace devices when they fail or when you have a specific reason to upgrade.
Will my existing Apple HomeKit devices work with Matter? Most newer HomeKit devices have been updated to also speak Matter. Older HomeKit-only devices (especially those that haven’t received firmware updates in years) may remain HomeKit-only. Check the manufacturer’s documentation. Home Assistant supports both HomeKit and Matter, so existing HomeKit devices integrate either way.
Does Matter mean I don’t need a smart home hub anymore? No. You still need a controller. That’s the hub. The difference is that with Matter, you can choose which controller you use without being locked to a specific brand, and you can change later without replacing all your devices.
What about Z-Wave? Z-Wave is similar to Zigbee, a perfectly good protocol that’s not part of the Matter ecosystem. Z-Wave devices work fine with Home Assistant and aren’t going away. New installs increasingly favour Matter and Thread because of the broader ecosystem support, but there’s no urgency to retire existing Z-Wave equipment.
Is Thread the same as Wi-Fi? No. Thread is a separate radio protocol on the 2.4 GHz band. It uses much less power than Wi-Fi (good for battery devices) but has lower bandwidth (so it can’t stream video). Modern smart home networks typically run Thread and Wi-Fi simultaneously, with each being used for what it’s best at.