Smart Home Hubs: What They Do and When You Need One

The Hub’s Job: Protocol Translation and Central Control

A home automation system typically connects controlled devices to a central smart home hub, sometimes called a gateway. The hub’s main job is translation. Your smart bulb or door sensor speaks a low-power radio protocol like Zigbee or Thread, and your router speaks Wi-Fi. Those two languages are not directly compatible, so the hub sits between them and converts commands in both directions.

Beyond translation, the hub gives you one app and one automation engine for devices from many different brands. Without it, each device would need its own separate app, and devices from different makers could not trigger actions on each other.

Why Some Devices Need a Hub and Others Don’t

Not every smart device requires a hub. The split comes down to which radio the device uses to communicate.

• Wi-Fi devices (smart plugs, many cameras, video doorbells) connect directly to your router the same way a laptop does. No hub is required—though they typically depend on the manufacturer’s cloud service to function. If that cloud goes offline, local control is often lost. If you’ve ever had a smart plug that won’t connect to Wi-Fi, you’ve seen how directly that cloud dependency affects usability.
• Zigbee and Thread devices use low-power mesh radio signals that your router cannot receive natively. They require a hub or border router to bridge the gap to your network.
• Bluetooth devices pair directly to a phone or smart speaker, which can act as a local bridge. Home automation devices are increasingly interfaced with mobile phones through Bluetooth, allowing for increased affordability and flexibility for the user.

How Thread and Matter Change the Hub Picture

Thread is an open, IPv6-based mesh protocol built for low-energy IoT devices. IPv6 is a standard way for devices to get addresses on a network. It gives devices a way to talk to each other and to the cloud without a dedicated hub box. However, it does need a Thread Border Router. This is a device that connects the Thread mesh to your home IP network. Some smart speakers and streaming devices now include a Thread Border Router radio, so you may already own one. For a deeper look, see Thread Border Router explained and why you need it.

Matter is a newer app-layer standard for smart home devices. An app-layer standard is a shared set of rules that lets devices from different brands talk to each other. It is backed by Amazon, Apple, Google, Samsung SmartThings, and others through the Connectivity Standards Alliance (CSA). It runs on Wi-Fi and Thread, and uses Bluetooth Low Energy to set up new devices. Matter’s goal is to let devices from different brands work together under any compatible app, which reduces the need for brand-specific hubs.

Important caveat: Matter improves cross-brand compatibility, but it does not guarantee every feature of every device works in every app. Advanced features—custom scenes, energy reporting, proprietary modes—may still require the maker’s own app or hub. The CSA, which promotes Matter, has a direct interest in the standard’s adoption, so claims of seamless interoperability should be weighed with that in mind.

Do You Actually Need a Hub? A Quick Decision Guide

The Real Downside: Vendor Lock-In and Fragmentation

Historically, smart home systems were sold as complete packages. One vendor supplied the hardware, the protocol, the hub, and the app. Customers who chose a proprietary ecosystem risked being stranded if the vendor stopped support. A well-documented concern is that customers may hesitate to tie their smart home future to proprietary protocols that can fade or become difficult to customize and interconnect.

Open protocols like Zigbee, Thread, and Matter reduce that risk, but they don’t eliminate it. A hub running open firmware can outlast a vendor’s cloud service. A Wi-Fi device tied to a discontinued cloud cannot. If long-term reliability matters to you—for a smart thermostat or a security lock, for example—a hub with local processing is generally more resilient than a cloud-only Wi-Fi device.

How to Decide What Setup You Need

Start with the devices you already own or plan to buy, then check their radio protocol in the product specs.

1. If all your devices are Wi-Fi or Bluetooth, you likely don’t need a dedicated hub today.
2. If you’re adding Zigbee sensors or switches, you need a Zigbee coordinator—the device that manages all Zigbee devices on your network. Check whether a device you already own includes a built-in Zigbee radio. Note: specific built-in radio specs are not confirmed by the sources used here; verify on the manufacturer’s product page before purchasing.
3. If you’re building around Thread and Matter, confirm that at least one device on your network acts as a Thread Border Router.
4. If you want automations that run locally without internet, a hub with local processing is the right choice regardless of protocol.