head to head · open source
CrateDB vs OpenMQTTGateway
CrateDB has 4,436 GitHub stars, 617 forks, 332 open issues and last shipped 2 days ago. OpenMQTTGateway has 4,094 stars, 906 forks, 48 open issues and last shipped today. CrateDB leads on adoption by 8% (4,436 vs 4,094 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%. OpenMQTTGateway 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 | 2026-09-18 | 2026-09-20 |
| Forks | ⑂ 617 | ⑂ 906 |
| 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
CrateDB is a distributed, scalable SQL database built for storing and analyzing massive amounts of data in near real time, including complex queries. It is written in Java, licensed under Apache 2.0, and based on Lucene. The project combines the benefits of an SQL database with the scalability and flexibility typically associated with NoSQL databases, and it is PostgreSQL compatible, speaking the PostgreSQL wire protocol as well as offering an HTTP API. It lives in the analytics, big data, and IoT ecosystem, and the topic list places it alongside distributed SQL databases, Elasticsearch, industrial IoT, and IoT a…
read the full CrateDB overview →
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 →
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Frequently asked questions
Is CrateDB or OpenMQTTGateway more popular?
CrateDB has 4,436 GitHub stars and OpenMQTTGateway has 4,094. 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 (4,436 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.