head to head · open source
CrateDB vs Expandable-6-Channel-ESP32-Energy-Meter
CrateDB has 4,441 GitHub stars, 618 forks, 332 open issues and last shipped yesterday. Expandable-6-Channel-ESP32-Energy-Meter has 690 stars, 134 forks, 18 open issues and last shipped 21 days ago. CrateDB leads on adoption by 544% (4,441 vs 690 stars). CrateDB is written in Java under Apache-2.0; Expandable-6-Channel-ESP32-Energy-Meter is written in C++ under MIT. CrateDB has attracted 14% as many forks as stars, Expandable-6-Channel-ESP32-Energy-Meter 19%. 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 | Expandable-6-Channel-ESP32-Energy-Meter | |
|---|---|---|
| GitHub stars | ★ 4.4K | ★ 690 |
| License | Apache-2.0 | MIT |
| Written in | Java | C++ |
| Last push | 2026-09-24 | 2026-09-04 |
| Forks | ⑂ 618 | ⑂ 134 |
| 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 Expandable-6-Channel-ESP32-Energy-Meter if
- You want the Expandable-6-Channel-ESP32-Energy-Meter feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C++
- You evaluated both and Expandable-6-Channel-ESP32-Energy-Meter 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 Expandable-6-Channel-ESP32-Energy-Meter
The CircuitSetup Expandable 6 Channel ESP32 Energy Meter is a hardware and software documentation project for a real time power and energy monitor built around two ATM90E32AS metering ICs, intended for homeowners, electricians and home automation users working with ESPHome and Home Assistant.
read the full Expandable-6-Channel-ESP32-Energy-Meter overview →
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Frequently asked questions
Is CrateDB or Expandable-6-Channel-ESP32-Energy-Meter more popular?
CrateDB has 4,441 GitHub stars and Expandable-6-Channel-ESP32-Energy-Meter has 690. CrateDB has the larger community by that measure.
Are CrateDB and Expandable-6-Channel-ESP32-Energy-Meter free?
Both are open source. CrateDB is licensed under Apache-2.0 and Expandable-6-Channel-ESP32-Energy-Meter under MIT. Neither carries a licence fee.
What is the difference between CrateDB and Expandable-6-Channel-ESP32-Energy-Meter?
CrateDB is written in Java and Expandable-6-Channel-ESP32-Energy-Meter 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 Expandable-6-Channel-ESP32-Energy-Meter?
Choose CrateDB if you want the larger community (4,441 stars) or its Apache-2.0 licence terms. Choose Expandable-6-Channel-ESP32-Energy-Meter if its feature set, stack or MIT licence fits better. Both are self-hostable.