head to head · open source
CocoIndex vs chunjun
CocoIndex has 11,566 GitHub stars, 899 forks, 83 open issues and last shipped 2 days ago. chunjun has 4,101 stars, 1,683 forks, 287 open issues and last shipped 10 months ago. CocoIndex leads on adoption by 182% (11,566 vs 4,101 stars). CocoIndex is written in Rust under Apache-2.0; chunjun is written in Java under Apache-2.0. CocoIndex has attracted 8% as many forks as stars, chunjun 41%. CocoIndex 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
| CocoIndex | chunjun | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 4.1K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Rust | Java |
| Last push | 2026-09-16 | 2025-12-02 |
| Forks | ⑂ 899 | ⑂ 1.7K |
| 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 chunjun if
- You want the chunjun 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 chunjun 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 chunjun
ChunJun is a Java based, Apache 2.0 licensed data integration framework that lives in the Apache Flink big data ecosystem. It is a distributed framework for synchronization and calculation between heterogeneous data sources, and it was initially known as FlinkX before being renamed ChunJun on February 22, 2022.
read the full chunjun overview →
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Frequently asked questions
Is CocoIndex or chunjun more popular?
CocoIndex has 11,566 GitHub stars and chunjun has 4,101. CocoIndex has the larger community by that measure.
Are CocoIndex and chunjun free?
Both are open source. CocoIndex is licensed under Apache-2.0 and chunjun under Apache-2.0. Neither carries a licence fee.
What is the difference between CocoIndex and chunjun?
CocoIndex is written in Rust and chunjun 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 chunjun?
Choose CocoIndex if you want the larger community (11,566 stars) or its Apache-2.0 licence terms. Choose chunjun if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.