head to head · open source
CrateDB vs OpenMQTTGateway
CrateDB has 4,449 GitHub stars, 620 forks, 332 open issues and last shipped yesterday. OpenMQTTGateway has 4,117 stars, 910 forks, 48 open issues and last shipped 17 days ago. CrateDB leads on adoption by 8% (4,449 vs 4,117 stars). CrateDB is written in Java under Apache-2.0; OpenMQTTGateway is written in C++ under GPL-3.0. CrateDB has attracted 14% as many forks as stars, OpenMQTTGateway 22%. CrateDB was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| CrateDB | OpenMQTTGateway | |
|---|---|---|
| GitHub stars | ★ 4.4K | ★ 4.1K |
| License | Apache-2.0 | GPL-3.0 |
| Written in | Java | C++ |
| Last push | 2026-11-04 | 2026-10-19 |
| Forks | ⑂ 620 | ⑂ 910 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick CrateDB if
- You weight community size — 4.4K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick OpenMQTTGateway if
- You want the OpenMQTTGateway feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches C++
- You evaluated both and OpenMQTTGateway fits your workflow better
About CrateDB
.. image:: docs/ static/crate logo.svg :alt: CrateDB :target: .. image:: :target: .. image:: :target: .. image:: :target: Help us improve CrateDB by taking our User Survey! About ===== CrateDB is a distributed SQL database that makes it simple to store and analyze massive amounts of data in real time. CrateDB offers the benefits of an SQL database and the scalability and flexibility typically associated with NoSQL databases. Modest CrateDB clusters can ingest tens of thousands of records per second without breaking a sweat. You can run ad hoc queries using standard SQL . CrateDB's blazing fast distributed query…
read the full CrateDB overview →
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 →
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Frequently asked questions
Is CrateDB or OpenMQTTGateway more popular?
CrateDB has 4,449 GitHub stars and OpenMQTTGateway has 4,117. CrateDB has the larger community by that measure.
Are CrateDB and OpenMQTTGateway free?
Both are open source. CrateDB is licensed under Apache-2.0 and OpenMQTTGateway under GPL-3.0. Neither carries a licence fee.
What is the difference between CrateDB and OpenMQTTGateway?
CrateDB is written in Java and OpenMQTTGateway 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, CrateDB or OpenMQTTGateway?
Choose CrateDB if you want the larger community (4,449 stars) or its Apache-2.0 licence terms. Choose OpenMQTTGateway if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.