head to head · open source
espectre vs CrateDB
espectre has 9,747 GitHub stars, 741 forks, 13 open issues and last shipped 3 days ago. CrateDB has 4,449 stars, 621 forks, 332 open issues and last shipped yesterday. espectre leads on adoption by 119% (9,747 vs 4,449 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.
← all 20902 open source comparisons
Side by side
| espectre | CrateDB | |
|---|---|---|
| GitHub stars | ★ 9.7K | ★ 4.4K |
| License | GPL-3.0 | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-11-03 | 2026-11-05 |
| Forks | ⑂ 741 | ⑂ 621 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick espectre if
- You weight community size — 9.7K 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 Turn an ESP32 into a private, local Wi Fi motion sensor. When someone moves through a room, they change the way Wi Fi signals travel through it. ESPectre reads those changes and reports motion in real time. No camera, no microphone, no wearable, and no dedicated radar hardware: just a supported ESP32 and the Wi Fi network already in the room. ESPectre is an open source platform that brings together ready to flash firmware, an embeddable C++ SDK, a MicroPython implementation, browser tools, a host CLI, an open dataset, open model weights, and the research workflow used to build and validate the…
read the full espectre overview →
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 →
More in Miscellaneous
Related comparisons
More Internet of Things (IoT) projects
Compare either of these against the rest of the Internet of Things (IoT) field.
Frequently asked questions
Is espectre or CrateDB more popular?
espectre has 9,747 GitHub stars and CrateDB has 4,449. 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 (9,747 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.