head to head · open source
OpenMQTTGateway vs OpenCCU
OpenMQTTGateway has 4,094 GitHub stars, 906 forks, 48 open issues and last shipped today. OpenCCU has 1,833 stars, 221 forks, 189 open issues and last shipped yesterday. OpenMQTTGateway leads on adoption by 123% (4,094 vs 1,833 stars). OpenMQTTGateway is written in C++ under GPL-3.0; OpenCCU is written in JavaScript under Apache-2.0. OpenMQTTGateway has attracted 22% as many forks as stars, OpenCCU 12%. OpenMQTTGateway was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (home-automation), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| OpenMQTTGateway | OpenCCU | |
|---|---|---|
| GitHub stars | ★ 4.1K | ★ 1.8K |
| License | GPL-3.0 | Apache-2.0 |
| Written in | C++ | JavaScript |
| Last push | 2026-09-20 | 2026-09-19 |
| Forks | ⑂ 906 | ⑂ 221 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenMQTTGateway if
- You weight community size — 4.1K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches C++
- You value the larger contributor base for long-term maintenance
pick OpenCCU if
- You want the OpenCCU feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and OpenCCU fits your workflow better
About OpenMQTTGateway
OpenMQTTGateway is an open source C++ gateway firmware for ESP8266 and ESP32 boards that connects local radio and sensor protocols to MQTT. It lives in the home automation ecosystem and is associated with Home Assistant, OpenHAB, NodeRed, and AWS IOT. The project aims to unify various technologies and protocols into a single firmware, reducing the need for multiple physical bridges.
read the full OpenMQTTGateway overview →
About OpenCCU
OpenCCU is a free, non commercial, open source Buildroot based operating system that turns Homematic IP and HomeMatic hardware into a cloud free smart home hub, aimed at owners of eQ 3 CCU3 or ELV Charly hardware, Raspberry Pi and other single board computers, and x86 64 or aarch64 hosts who want vendor grade CCU behaviour without depending on a vendor cloud.
read the full OpenCCU overview →
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Frequently asked questions
Is OpenMQTTGateway or OpenCCU more popular?
OpenMQTTGateway has 4,094 GitHub stars and OpenCCU has 1,833. OpenMQTTGateway has the larger community by that measure.
Are OpenMQTTGateway and OpenCCU free?
Both are open source. OpenMQTTGateway is licensed under GPL-3.0 and OpenCCU under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenMQTTGateway and OpenCCU?
OpenMQTTGateway is written in C++ and OpenCCU in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenMQTTGateway or OpenCCU?
Choose OpenMQTTGateway if you want the larger community (4,094 stars) or its GPL-3.0 licence terms. Choose OpenCCU if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.