head to head · open source
dagster vs langchain4j
dagster has 16,168 GitHub stars, 2,294 forks, 2,589 open issues and last shipped today. langchain4j has 13,121 stars, 2,557 forks, 878 open issues and last shipped 2 days ago. dagster leads on adoption by 23% (16,168 vs 13,121 stars). dagster is written in Python under Apache-2.0; langchain4j is written in Java under Apache-2.0. dagster has attracted 14% as many forks as stars, langchain4j 19%. dagster was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| dagster | langchain4j | |
|---|---|---|
| GitHub stars | ★ 16K | ★ 13K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-09-18 | 2026-09-16 |
| Forks | ⑂ 2.3K | ⑂ 2.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick dagster if
- You weight community size — 16K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick langchain4j if
- You want the langchain4j 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 langchain4j fits your workflow better
About dagster
Dagster is a cloud native data pipeline orchestrator written in Python and released under the Apache 2.0 licence, built for data engineers, data scientists, and machine learning teams who declare the tables, data sets, models, and reports their pipelines should produce and need those assets tested, observable, and kept up to date from local development through production.
read the full dagster overview →
About langchain4j
LangChain4j is an Apache 2.0, open source, idiomatic Java library for building LLM powered applications on the JVM, aimed at Java developers and enterprise teams who want one unified API over many LLM providers and embedding stores without leaving the Java ecosystem.
read the full langchain4j overview →
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Frequently asked questions
Is dagster or langchain4j more popular?
dagster has 16,168 GitHub stars and langchain4j has 13,121. dagster has the larger community by that measure.
Are dagster and langchain4j free?
Both are open source. dagster is licensed under Apache-2.0 and langchain4j under Apache-2.0. Neither carries a licence fee.
What is the difference between dagster and langchain4j?
dagster is written in Python and langchain4j 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, dagster or langchain4j?
Choose dagster if you want the larger community (16,168 stars) or its Apache-2.0 licence terms. Choose langchain4j if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.