head to head · open source
Langfuse vs dagster
Langfuse has 34,729 GitHub stars, 3,785 forks, 926 open issues and last shipped yesterday. dagster has 16,169 stars, 2,294 forks, 2,589 open issues and last shipped yesterday. Langfuse leads on adoption by 115% (34,729 vs 16,169 stars). Langfuse is written in TypeScript under a custom or non-standard licence; dagster is written in Python under Apache-2.0. Langfuse has attracted 11% as many forks as stars, dagster 14%. Langfuse was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (analytics), 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
| Langfuse | dagster | |
|---|---|---|
| GitHub stars | ★ 35K | ★ 16K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.8K | ⑂ 2.3K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Langfuse if
- You weight community size — 35K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick dagster if
- You want the dagster feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and dagster fits your workflow better
About Langfuse
Langfuse is an open source LLM engineering platform for building, monitoring, and improving AI powered applications. It lives in the LLMops ecosystem and provides tooling for the full development lifecycle—from prompt iteration and evaluation to observability and dataset management. Built with TypeScript and powered by ClickHouse, it enables teams to track LLM calls, user sessions, and internal logic like retrieval or agent actions in a unified interface.
read the full Langfuse overview →
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 →
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Frequently asked questions
Is Langfuse or dagster more popular?
Langfuse has 34,729 GitHub stars and dagster has 16,169. Langfuse has the larger community by that measure.
Are Langfuse and dagster free?
Both are open source. Langfuse has no licence declared in this registry, and dagster is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Langfuse and dagster?
Langfuse is written in TypeScript and dagster in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Langfuse or dagster?
Choose Langfuse if you want the larger community (34,729 stars) or its Custom / other licence terms. Choose dagster if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.