head to head · open source
CocoIndex vs flink-cdc
CocoIndex has 11,566 GitHub stars, 899 forks, 83 open issues and last shipped 2 days ago. flink-cdc has 6,475 stars, 2,196 forks, 119 open issues and last shipped yesterday. CocoIndex leads on adoption by 79% (11,566 vs 6,475 stars). CocoIndex is written in Rust under Apache-2.0; flink-cdc is written in Java under Apache-2.0. CocoIndex has attracted 8% as many forks as stars, flink-cdc 34%. flink-cdc was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (change-data-capture, 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 | flink-cdc | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 6.5K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Rust | Java |
| Last push | 2026-09-16 | 2026-09-17 |
| Forks | ⑂ 899 | ⑂ 2.2K |
| 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 flink-cdc if
- You want the flink-cdc 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 flink-cdc 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 flink-cdc
Flink CDC is an Apache 2.0 streaming data integration tool built on Apache Flink that moves real time and batch data between databases and downstream systems, and it is aimed at data engineers and platform teams who need change data capture pipelines without writing per source job code.
read the full flink-cdc overview →
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Frequently asked questions
Is CocoIndex or flink-cdc more popular?
CocoIndex has 11,566 GitHub stars and flink-cdc has 6,475. CocoIndex has the larger community by that measure.
Are CocoIndex and flink-cdc free?
Both are open source. CocoIndex is licensed under Apache-2.0 and flink-cdc under Apache-2.0. Neither carries a licence fee.
What is the difference between CocoIndex and flink-cdc?
CocoIndex is written in Rust and flink-cdc 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 flink-cdc?
Choose CocoIndex if you want the larger community (11,566 stars) or its Apache-2.0 licence terms. Choose flink-cdc if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.