openHAB vs Zigbee2MQTT
A side-by-side comparison of two self-hosted home automation options — licensing, setup difficulty, resource needs, and what each one replaces.
openHAB
Vendor-neutral open-source home automation
VS
Zigbee2MQTT
Bridge Zigbee devices to MQTT without vendor hubs
| Feature | openHAB | Zigbee2MQTT |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 79 · Good | 95 · Excellent |
| Category | Home Automation | Home Automation |
| License | EPL-2.0 | GPL-3.0 |
| Language | Java | TypeScript |
| Setup difficulty | Hard | Medium |
| Min. RAM | 1,024 MB | 256 MB |
| Deployment | docker, bare-metal | docker, bare-metal |
| GitHub stars | ★ 1,142 | ★ 15,661 |
| First released | 2010 | 2018 |
| Replaces | SmartThings, Google Home | SmartThings |
What are openHAB and Zigbee2MQTT?
openHAB
openHAB is a vendor-neutral, open-source home automation platform that integrates many devices and technologies behind one system. It targets smart home enthusiasts wanting deep configurability. It is deployed via Docker or native packages.
- Hundreds of device bindings
- Powerful rule engine
- Runs fully offline
- Cross-platform
Zigbee2MQTT
Zigbee2MQTT bridges Zigbee devices to MQTT, allowing them to be used without proprietary vendor hubs or bridges. It targets smart home users wanting vendor-neutral Zigbee control. It is deployed via Docker.
- Supports thousands of Zigbee devices
- No vendor hub required
- MQTT integration
- Web-based control panel
openHAB vs Zigbee2MQTT: key differences
OpenHAB is written in Java, while Zigbee2MQTT is built with TypeScript. Licensing differs — EPL-2.0 for openHAB versus GPL-3.0 for Zigbee2MQTT. Zigbee2MQTT is the lighter option, starting around 256 MB of RAM against 1,024 MB for openHAB. OpenHAB is the more established project (first released 2010), while Zigbee2MQTT arrived in 2018. Zigbee2MQTT has the considerably larger community, at 15,661 GitHub stars versus 1,142.
Why pick each one
Choose openHAB if…
- Very flexible
- Vendor neutral
- Mature project
Watch out for
- Steep learning curve
- Heavier Java runtime
Choose Zigbee2MQTT if…
- Frees devices from vendor hubs
- Wide device support
- Local control
Watch out for
- Needs a Zigbee coordinator
- Pairing can be finicky
Frequently asked questions
Is openHAB or Zigbee2MQTT better?
Zigbee2MQTT is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider openHAB if its specific feature set fits your needs better.
Are openHAB and Zigbee2MQTT free and open-source?
Yes. openHAB is licensed under EPL-2.0 and Zigbee2MQTT under GPL-3.0. Both can be self-hosted at no software cost.
Can I run openHAB and Zigbee2MQTT with Docker?
openHAB: yes. Zigbee2MQTT: yes.
Which is lighter on resources, openHAB or Zigbee2MQTT?
Zigbee2MQTT has the smaller minimum footprint at 256 MB of RAM, compared to about 1,024 MB for openHAB. Real-world usage depends on library size, user count, and enabled features.