head to head · open source
flink-cdc vs olake
flink-cdc has 6,477 GitHub stars, 2,197 forks, 119 open issues and last shipped 2 days ago. olake has 1,453 stars, 252 forks, 178 open issues and last shipped yesterday. flink-cdc leads on adoption by 346% (6,477 vs 1,453 stars). flink-cdc is written in Java under Apache-2.0; olake is written in Go under Apache-2.0. flink-cdc has attracted 34% as many forks as stars, olake 17%. olake was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 5 topic tags (cdc, change-data-capture, data-pipeline, elt), 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 | olake | |
|---|---|---|
| GitHub stars | ★ 6.5K | ★ 1.5K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Java | Go |
| Last push | 2026-09-18 | 2026-09-19 |
| Forks | ⑂ 2.2K | ⑂ 252 |
| 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 olake if
- You want the olake feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Go
- You evaluated both and olake 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 olake
OLake Go is an open source data ingestion engine written in Go and licensed under Apache 2.0. It replicates transactional databases, Apache Kafka, and S3 into Apache Iceberg or plain Parquet, and it provides a web UI and a command line interface for building scalable, real time pipelines. The project sits in the Apache Iceberg and lakehouse ecosystem, where its stated goal is to move data into vendor neutral table formats that can be read by query engines and warehouses.
read the full olake overview →
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Frequently asked questions
Is flink-cdc or olake more popular?
flink-cdc has 6,477 GitHub stars and olake has 1,453. flink-cdc has the larger community by that measure.
Are flink-cdc and olake free?
Both are open source. flink-cdc is licensed under Apache-2.0 and olake under Apache-2.0. Neither carries a licence fee.
What is the difference between flink-cdc and olake?
flink-cdc is written in Java and olake 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 olake?
Choose flink-cdc if you want the larger community (6,477 stars) or its Apache-2.0 licence terms. Choose olake if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.