head to head · open source
flink-cdc vs peerdb
flink-cdc has 6,477 GitHub stars, 2,197 forks, 119 open issues and last shipped 2 days ago. peerdb has 3,274 stars, 213 forks, 204 open issues and last shipped yesterday. flink-cdc leads on adoption by 98% (6,477 vs 3,274 stars). flink-cdc is written in Java under Apache-2.0; peerdb is written in Go under AGPL-3.0. flink-cdc has attracted 34% as many forks as stars, peerdb 7%. peerdb was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (cdc, etl, kafka), 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 | peerdb | |
|---|---|---|
| GitHub stars | ★ 6.5K | ★ 3.3K |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Java | Go |
| Last push | 2026-09-18 | 2026-09-19 |
| 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 peerdb if
- You want the peerdb feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Go
- You evaluated both and peerdb 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 peerdb
PeerDB is a data integration project in the Postgres ecosystem. It lives in the Data & Analytics / Data Engineering & Integration category and focuses on streaming data from Postgres to data warehouses, queues, and storage engines. The project is built around Postgres first ETL and change data capture workflows rather than a broad connector catalog.
read the full peerdb overview →
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Frequently asked questions
Is flink-cdc or peerdb more popular?
flink-cdc has 6,477 GitHub stars and peerdb has 3,274. flink-cdc has the larger community by that measure.
Are flink-cdc and peerdb free?
Both are open source. flink-cdc is licensed under Apache-2.0 and peerdb under AGPL-3.0. Neither carries a licence fee.
What is the difference between flink-cdc and peerdb?
flink-cdc is written in Java and peerdb in Go. 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 peerdb?
Choose flink-cdc if you want the larger community (6,477 stars) or its Apache-2.0 licence terms. Choose peerdb if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.