ConBee II vs ConBee III: Which Zigbee USB Gateway Fits Your Smart Home

The ConBee II and ConBee III are the two most common picks for anyone building a Zigbee network around Home Assistant, deCONZ, or Zigbee2MQTT, and the choice between them comes down to budget against headroom. The ConBee II is the long-standing, inexpensive workhorse; the ConBee III is the newer, pricier dongle aimed at buyers who want more capacity and a longer useful life. This comparison lays out the differences dimension by dimension so the decision takes a minute, not an afternoon.

ConBee II

Type: USB Zigbee gateway dongle
Protocol: Zigbee 3.0
Included Software: deCONZ and Phoscon App
Platform Support: Home Assistant, ioBroker, Zigbee2MQTT
Price Tier: Budget

The ConBee II is a USB stick that turns a computer, mini PC, or single-board machine into a Zigbee coordinator. It ships with deCONZ and the Phoscon App, so a buyer can get a network running without hunting for firmware or a separate bridge, and it is recognized by Home Assistant, ioBroker, and Zigbee2MQTT for anyone who prefers a different stack. The form factor is the appeal: it plugs into a spare USB port and disappears.

What makes it the default recommendation for so many setups is the price. At the budget end of the gateway market, it covers the core job — pairing Zigbee sensors, lights, and switches and exposing them to a home automation hub — without adding cost to a build that may already include a server. Buyers running a modest network of a few dozen devices will rarely notice the difference between this and a newer coordinator.

Trade-off: The ConBee II is the older generation of the two, so buyers planning a large, long-lived Zigbee network may find themselves upgrading sooner than expected.

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ConBee III

Type: USB Zigbee gateway dongle
Protocol: Zigbee 3.0
Included Software: deCONZ and Phoscon App
Platform Support: Home Assistant, ioBroker, Zigbee2MQTT
Price Tier: Premium

The ConBee III is the current-generation version of the same idea: a USB Zigbee 3.0 coordinator with deCONZ and the Phoscon App in the box, supported by Home Assistant, ioBroker, and Zigbee2MQTT. It is the direct successor to the ConBee II, which means the software ecosystem and setup workflow carry over — a buyer moving from the older dongle can expect a familiar experience, and a first-time buyer gets the same documented path.

The premium price buys headroom. The newer hardware is aimed at denser networks and longer-term use, and buyers who intend to grow a Zigbee deployment across a whole house will get more mileage before the coordinator becomes the limiting factor. It is the pick for anyone who would rather buy once than replace a gateway in a year or two.

Trade-off: The ConBee III costs roughly double the ConBee II, which is hard to justify for a small network that will never approach the older model’s limits.

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ConBee II vs ConBee III Side by Side

Product	Key Spec	Best Use	Price Tier
ConBee II	Zigbee 3.0 USB gateway with deCONZ and Phoscon App	Budget builds and small-to-mid Zigbee networks	Budget
ConBee III	Zigbee 3.0 USB gateway dongle with deCONZ and Phoscon App	Larger networks and buyers who want long-term headroom	Premium

How the Two Gateways Compare

The first dimension is price, and it is the widest gap between the two. The ConBee II sits at the budget end of the Zigbee coordinator market, while the ConBee III is priced as a premium dongle at roughly twice the cost. For a buyer adding Zigbee to an existing Home Assistant box, that difference usually decides the purchase before any other specification is considered.

The second dimension is generation. The ConBee III is the newer product, and newer coordinator hardware is aimed at denser device counts and longer service life. That does not make the ConBee II obsolete — it remains a fully capable Zigbee 3.0 gateway supported by the same software stack — but it does mean the older model has less room to grow. Buyers who expect their network to stay small get little from the upgrade; buyers who expect it to expand get real value from the newer hardware.

The third dimension is the software experience, and here the two are effectively tied. Both ship with deCONZ and the Phoscon App, both are listed for Home Assistant, ioBroker, and Zigbee2MQTT, and both speak Zigbee 3.0. A buyer will not choose between them on platform compatibility — the choice is entirely about budget against headroom.

A fourth consideration is timing. Because the ConBee III is the current-generation product, it is the one that will keep receiving attention as the ecosystem moves forward, while the ConBee II increasingly becomes the legacy option. That matters most for buyers who plan to keep the same coordinator for several years.

Which Should You Buy?

Choose the ConBee II if the budget is tight, the Zigbee network is modest, and the priority is getting sensors and lights onto Home Assistant or Zigbee2MQTT with as little spend as possible. It is also the sensible pick for a second location, a test bench, or a build where the gateway is one line item among many.

Choose the ConBee III if the network is expected to grow across a whole home, the coordinator needs to last, or the buyer would rather pay once for the current generation than replace a gateway later. The premium is easiest to justify when the Zigbee deployment is the core of the smart home rather than a side project.

FAQ

1. Is the ConBee III a direct replacement for the ConBee II?
   Yes. Both are Zigbee 3.0 USB gateways with deCONZ and the Phoscon App, and both are supported by Home Assistant, ioBroker, and Zigbee2MQTT, so the ConBee III slots into the same role.

2. Do both gateways work with Home Assistant and Zigbee2MQTT?
   Both product names list Home Assistant, ioBroker, and Zigbee2MQTT alongside deCONZ and the Phoscon App, so either can be used with those platforms.

3. Is the ConBee II still worth buying?
   For a small or mid-sized network on a tight budget, yes. It is the cheaper way into a Zigbee 3.0 coordinator and covers the core job of pairing devices and exposing them to a hub.

4. Why does the ConBee III cost more?
   It is the newer generation of the same gateway line, priced as a premium dongle with more headroom for larger networks and longer service life.

5. Which one suits a first smart home setup?
   The ConBee II is the lower-risk first purchase because of its price. Buyers who already know the network will grow should start with the ConBee III instead.

6. Do both need the deCONZ software?
   Both ship with deCONZ and the Phoscon App included, but they are also listed for Zigbee2MQTT and Home Assistant, so the included software is a starting point rather than a requirement.

Bottom Line

For most buyers the ConBee II is the smarter purchase: it delivers the full Zigbee 3.0 gateway job with deCONZ, the Phoscon App, Home Assistant, ioBroker, and Zigbee2MQTT support at the budget end of the market. The ConBee II is the pick unless the network is expected to grow large enough that the ConBee III’s newer hardware and extra headroom earn back the premium.