head to head · open source
OpenMQTTGateway vs button-card
OpenMQTTGateway has 4,117 GitHub stars, 910 forks, 48 open issues and last shipped 17 days ago. button-card has 2,524 stars, 285 forks, 31 open issues and last shipped 2 months ago. OpenMQTTGateway leads on adoption by 63% (4,117 vs 2,524 stars). OpenMQTTGateway is written in C++ under GPL-3.0; button-card is written in TypeScript under MIT. OpenMQTTGateway has attracted 22% as many forks as stars, button-card 11%. OpenMQTTGateway was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (home-assistant, 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 | button-card | |
|---|---|---|
| GitHub stars | ★ 4.1K | ★ 2.5K |
| License | GPL-3.0 | MIT |
| Written in | C++ | TypeScript |
| Last push | 2026-10-19 | 2026-09-09 |
| Forks | ⑂ 910 | ⑂ 285 |
| 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 button-card if
- You want the button-card feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and button-card fits your workflow better
About OpenMQTTGateway
OpenMQTTGateway aims to unify various technologies and protocols into a single firmware. This reduces the need for multiple physical bridges and streamlines diverse technologies under the widely used MQTT protocol. Sponsors Documentation The documentation is here New to OpenMQTTGateway? Follow the Getting Started guide to flash a board from your browser and see your first sensor data in about 15 minutes. The reference sheet, with the list of all functions, pinouts is here Upload Upload OpenMQTTGateway directly from the upload page (no additional software required) or build your own configuration with PlatformIO…
read the full OpenMQTTGateway overview →
About button-card
Button Card by @RomRider [![Stable][releases shield]][releases] [![Beta][releases dev shield]][releases dev] [![HACS Badge][hacs badge]][hacs link] ![Project Maintenance][maintenance shield] ![Downloads][downloads] [![GitHub Activity][commits shield]][commits] [![License][license shield]](LICENSE.md) [![Discord][discord shield]][discord] [![Community Forum][forum shield]][forum] [commits shield]: [commits]: [discord]: [discord shield]: [forum shield]: [forum]: [license shield]: [maintenance shield]: [releases shield]: [releases]: [releases dev shield]: [releases dev]: [hacs badge]: [downloads]: [hacs link]…
read the full button-card overview →
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Frequently asked questions
Is OpenMQTTGateway or button-card more popular?
OpenMQTTGateway has 4,117 GitHub stars and button-card has 2,524. OpenMQTTGateway has the larger community by that measure.
Are OpenMQTTGateway and button-card free?
Both are open source. OpenMQTTGateway is licensed under GPL-3.0 and button-card under MIT. Neither carries a licence fee.
What is the difference between OpenMQTTGateway and button-card?
OpenMQTTGateway is written in C++ and button-card in TypeScript. 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 button-card?
Choose OpenMQTTGateway if you want the larger community (4,117 stars) or its GPL-3.0 licence terms. Choose button-card if its feature set, stack or MIT licence fits better. Both are self-hostable.