head to head · open source
CocoIndex vs Addax
CocoIndex has 11,566 GitHub stars, 899 forks, 83 open issues and last shipped 2 days ago. Addax has 1,439 stars, 343 forks, 5 open issues and last shipped yesterday. CocoIndex leads on adoption by 704% (11,566 vs 1,439 stars). CocoIndex is written in Rust under Apache-2.0; Addax is written in Java under Apache-2.0. CocoIndex has attracted 8% as many forks as stars, Addax 24%. Addax was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (etl), so they are genuine substitutes rather than adjacent tools.
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
| CocoIndex | Addax | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 1.4K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Rust | Java |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 899 | ⑂ 343 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick CocoIndex if
- You weight community size — 12K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Rust
- You value the larger contributor base for long-term maintenance
pick Addax if
- You want the Addax 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 Addax fits your workflow better
About CocoIndex
CocoIndex is an open source incremental data transformation engine for AI workloads, built in Rust with a Python interface and positioned in the data engineering, ETL, indexing, and AI agent ecosystem. It turns codebases, meeting notes, inboxes, Slack, PDFs, and videos into continuously fresh context for AI agents and LLM applications.
read the full CocoIndex overview →
About Addax
Addax is an open source, Java based ETL tool for moving data between relational databases, NoSQL stores, file formats, and big data systems. It is an actively maintained fork of Alibaba DataX, which the README describes as frozen since 2023, and it is positioned as the maintained successor for users who need continued updates, dependency fixes, and plugin development in the DataX ecosystem.
read the full Addax overview →
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Frequently asked questions
Is CocoIndex or Addax more popular?
CocoIndex has 11,566 GitHub stars and Addax has 1,439. CocoIndex has the larger community by that measure.
Are CocoIndex and Addax free?
Both are open source. CocoIndex is licensed under Apache-2.0 and Addax under Apache-2.0. Neither carries a licence fee.
What is the difference between CocoIndex and Addax?
CocoIndex is written in Rust and Addax 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, CocoIndex or Addax?
Choose CocoIndex if you want the larger community (11,566 stars) or its Apache-2.0 licence terms. Choose Addax if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.