head to head · open source
espectre vs CrateDB
espectre has 9,388 GitHub stars, 709 forks, 13 open issues and last shipped yesterday. CrateDB has 4,436 stars, 617 forks, 332 open issues and last shipped yesterday. espectre leads on adoption by 112% (9,388 vs 4,436 stars). espectre is written in Python under GPL-3.0; CrateDB is written in Java under Apache-2.0. espectre has attracted 8% as many forks as stars, CrateDB 14%. 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
| espectre | CrateDB | |
|---|---|---|
| GitHub stars | ★ 9.4K | ★ 4.4K |
| License | GPL-3.0 | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-09-21 | 2026-09-21 |
| Forks | ⑂ 709 | ⑂ 617 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick espectre if
- You weight community size — 9.4K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick CrateDB if
- You want the CrateDB feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and CrateDB fits your workflow better
About espectre
ESPectre is an open source Wi Fi CSI motion sensing platform that turns a supported ESP32 board into a private, local motion sensor reporting movement in real time, and it is built for embedded developers, Home Assistant users, and DIY builders who want room level sensing without cameras, microphones, wearables, or dedicated radar hardware.
read the full espectre overview →
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 →
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Frequently asked questions
Is espectre or CrateDB more popular?
espectre has 9,388 GitHub stars and CrateDB has 4,436. espectre has the larger community by that measure.
Are espectre and CrateDB free?
Both are open source. espectre is licensed under GPL-3.0 and CrateDB under Apache-2.0. Neither carries a licence fee.
What is the difference between espectre and CrateDB?
espectre is written in Python and CrateDB in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, espectre or CrateDB?
Choose espectre if you want the larger community (9,388 stars) or its GPL-3.0 licence terms. Choose CrateDB if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.