head to head · open source
flink-cdc vs ReplicaDB
flink-cdc has 6,477 GitHub stars, 2,197 forks, 119 open issues and last shipped 2 days ago. ReplicaDB has 500 stars, 114 forks, 4 open issues and last shipped 3 days ago. flink-cdc leads on adoption by 1,195% (6,477 vs 500 stars). flink-cdc is written in Java under Apache-2.0; ReplicaDB is written in Java under Apache-2.0. flink-cdc has attracted 34% as many forks as stars, ReplicaDB 23%. flink-cdc was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (elt, etl, kafka, 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 | ReplicaDB | |
|---|---|---|
| GitHub stars | ★ 6.5K | ★ 500 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Java |
| Last push | 2026-09-18 | 2026-09-17 |
| Forks | ⑂ 2.2K | ⑂ 114 |
| 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 ReplicaDB if
- You want the ReplicaDB 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 ReplicaDB 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 ReplicaDB
ReplicaDB is an open source, Apache 2.0 licensed command line tool written in Java that performs high performance bulk data replication between heterogeneous relational and non relational databases, and it is aimed at data engineers and operations teams who need repeatable batch transfers without installing database agents or triggers.
read the full ReplicaDB overview →
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Frequently asked questions
Is flink-cdc or ReplicaDB more popular?
flink-cdc has 6,477 GitHub stars and ReplicaDB has 500. flink-cdc has the larger community by that measure.
Are flink-cdc and ReplicaDB free?
Both are open source. flink-cdc is licensed under Apache-2.0 and ReplicaDB under Apache-2.0. Neither carries a licence fee.
What is the difference between flink-cdc and ReplicaDB?
flink-cdc is written in Java and ReplicaDB 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, flink-cdc or ReplicaDB?
Choose flink-cdc if you want the larger community (6,477 stars) or its Apache-2.0 licence terms. Choose ReplicaDB if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.