head to head · open source
flink-cdc vs pgsync
flink-cdc has 6,492 GitHub stars, 2,207 forks, 119 open issues and last shipped today. pgsync has 1,433 stars, 213 forks, 216 open issues and last shipped yesterday. flink-cdc leads on adoption by 353% (6,492 vs 1,433 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 | 2026-11-05 | 2026-11-04 |
| Forks | ⑂ 2.2K | ⑂ 213 |
| 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 a distributed data integration tool for real time data and batch data, built on top of Apache Flink. It prioritizes efficient end to end data integration and offers enhanced functionalities such as full database synchronization, sharding table synchronization, schema evolution and data transformation. API Layers Flink CDC provides three API layers for different usage scenarios: 1. YAML API (Pipeline API) The YAML API provides a declarative, zero code approach to define data pipelines. Users describe the source, sink, routing, transformation, and schema evolution rules in a YAML file and submit it…
read the full flink-cdc overview →
About pgsync
PGSync Real time PostgreSQL to Elasticsearch/OpenSearch sync Keep your relational database as the source of truth while powering lightning fast search Live Demo ↗ · Website · Documentation · Examples · Report Bug What is PGSync? PGSync is a change data capture tool that syncs data from PostgreSQL , MySQL , or MariaDB to Elasticsearch or OpenSearch in real time. Define your document structure in JSON, and PGSync handles the rest — no custom code required. Django integration: Use django pgsync to integrate PGSync with Django projects. PGSync Pro: Add real time semantic and hybrid search to Elasticsearch or…
read the full pgsync overview →
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Frequently asked questions
Is flink-cdc or pgsync more popular?
flink-cdc has 6,492 GitHub stars and pgsync has 1,433. 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 (6,492 stars) or its Apache-2.0 licence terms. Choose pgsync if its feature set, stack or MIT licence fits better. Both are self-hostable.