head to head · open source
flink-cdc vs ReplicaDB
flink-cdc has 6,491 GitHub stars, 2,205 forks, 119 open issues and last shipped yesterday. ReplicaDB has 504 stars, 113 forks, 4 open issues and last shipped 10 days ago. flink-cdc leads on adoption by 1,188% (6,491 vs 504 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 22%. 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 | ★ 504 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Java |
| Last push | 2026-11-04 | 2026-10-26 |
| Forks | ⑂ 2.2K | ⑂ 113 |
| 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 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 ReplicaDB
ReplicaDB is a high performance, open source command line tool for bulk data replication between heterogeneous databases. It enables efficient ETL/ELT workflows by transferring data in parallel between Oracle, PostgreSQL, MySQL, MongoDB, SQL Server, and other databases without requiring database agents or triggers. ReplicaDB supports a wide range of data sources including relational databases (Oracle, PostgreSQL, MySQL, MariaDB, SQL Server, SQLite, IBM DB2 LUW and DB2 for i), NoSQL databases (MongoDB), data virtualization platforms (Denodo), file formats (CSV), cloud storage (Amazon S3), and streaming platforms…
read the full ReplicaDB overview →
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Frequently asked questions
Is flink-cdc or ReplicaDB more popular?
flink-cdc has 6,491 GitHub stars and ReplicaDB has 504. 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 (6,491 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.