head to head · open source
OpenMQTTGateway vs Expandable-6-Channel-ESP32-Energy-Meter
OpenMQTTGateway has 4,096 GitHub stars, 906 forks, 48 open issues and last shipped 4 days ago. Expandable-6-Channel-ESP32-Energy-Meter has 690 stars, 134 forks, 18 open issues and last shipped 21 days ago. OpenMQTTGateway leads on adoption by 494% (4,096 vs 690 stars). OpenMQTTGateway is written in C++ under GPL-3.0; Expandable-6-Channel-ESP32-Energy-Meter is written in C++ under MIT. OpenMQTTGateway has attracted 22% as many forks as stars, Expandable-6-Channel-ESP32-Energy-Meter 19%. OpenMQTTGateway was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (esp32, home-assistant), 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 | Expandable-6-Channel-ESP32-Energy-Meter | |
|---|---|---|
| GitHub stars | ★ 4.1K | ★ 690 |
| License | GPL-3.0 | MIT |
| Written in | C++ | C++ |
| Last push | 2026-09-21 | 2026-09-04 |
| Forks | ⑂ 906 | ⑂ 134 |
| 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 Expandable-6-Channel-ESP32-Energy-Meter if
- You want the Expandable-6-Channel-ESP32-Energy-Meter feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C++
- You evaluated both and Expandable-6-Channel-ESP32-Energy-Meter 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 Expandable-6-Channel-ESP32-Energy-Meter
The CircuitSetup Expandable 6 Channel ESP32 Energy Meter is a hardware and software documentation project for a real time power and energy monitor built around two ATM90E32AS metering ICs, intended for homeowners, electricians and home automation users working with ESPHome and Home Assistant.
read the full Expandable-6-Channel-ESP32-Energy-Meter overview →
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Frequently asked questions
Is OpenMQTTGateway or Expandable-6-Channel-ESP32-Energy-Meter more popular?
OpenMQTTGateway has 4,096 GitHub stars and Expandable-6-Channel-ESP32-Energy-Meter has 690. OpenMQTTGateway has the larger community by that measure.
Are OpenMQTTGateway and Expandable-6-Channel-ESP32-Energy-Meter free?
Both are open source. OpenMQTTGateway is licensed under GPL-3.0 and Expandable-6-Channel-ESP32-Energy-Meter under MIT. Neither carries a licence fee.
What is the difference between OpenMQTTGateway and Expandable-6-Channel-ESP32-Energy-Meter?
OpenMQTTGateway is written in C++ and Expandable-6-Channel-ESP32-Energy-Meter in C++. 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 Expandable-6-Channel-ESP32-Energy-Meter?
Choose OpenMQTTGateway if you want the larger community (4,096 stars) or its GPL-3.0 licence terms. Choose Expandable-6-Channel-ESP32-Energy-Meter if its feature set, stack or MIT licence fits better. Both are self-hostable.