head to head · open source
flink-cdc vs pgsync
flink-cdc has 6,477 GitHub stars, 2,197 forks, 119 open issues and last shipped 2 days ago. pgsync has 1,421 stars, 212 forks, 216 open issues and last shipped 9 days ago. flink-cdc leads on adoption by 356% (6,477 vs 1,421 stars). flink-cdc is written in Java under Apache-2.0; pgsync is written in Python under MIT. flink-cdc has attracted 34% as many forks as stars, pgsync 15%. flink-cdc was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (change-data-capture, etl, mysql), 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
| flink-cdc | pgsync | |
|---|---|---|
| GitHub stars | ★ 6.5K | ★ 1.4K |
| License | Apache-2.0 | MIT |
| Written in | Java | Python |
| Last push | 2026-09-18 | 2026-09-11 |
| Forks | ⑂ 2.2K | ⑂ 212 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick flink-cdc if
- You weight community size — 6.5K 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 pgsync if
- You want the pgsync feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and pgsync fits your workflow better
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 →
About pgsync
PGSync is a change data capture tool that syncs PostgreSQL, MySQL, or MariaDB to Elasticsearch or OpenSearch in real time, aimed at teams that want to keep a relational database as the source of truth while serving fast search from a separate index.
read the full pgsync overview →
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Frequently asked questions
Is flink-cdc or pgsync more popular?
flink-cdc has 6,477 GitHub stars and pgsync has 1,421. flink-cdc has the larger community by that measure.
Are flink-cdc and pgsync free?
Both are open source. flink-cdc is licensed under Apache-2.0 and pgsync under MIT. Neither carries a licence fee.
What is the difference between flink-cdc and pgsync?
flink-cdc is written in Java and pgsync in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, flink-cdc or pgsync?
Choose flink-cdc if you want the larger community (6,477 stars) or its Apache-2.0 licence terms. Choose pgsync if its feature set, stack or MIT licence fits better. Both are self-hostable.