head to head · open source
PageIndex vs Langfuse
PageIndex has 35,678 GitHub stars, 3,148 forks, 103 open issues and last shipped yesterday. Langfuse has 34,729 stars, 3,785 forks, 926 open issues and last shipped yesterday. PageIndex leads on adoption by 3% (35,678 vs 34,729 stars). PageIndex is written in Python under MIT; Langfuse is written in TypeScript under a custom or non-standard licence. PageIndex has attracted 9% as many forks as stars, Langfuse 11%. Langfuse was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (llm), 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
| PageIndex | Langfuse | |
|---|---|---|
| GitHub stars | ★ 36K | ★ 35K |
| License | MIT | Custom / other |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.1K | ⑂ 3.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick PageIndex if
- You weight community size — 36K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Langfuse if
- You want the Langfuse feature set and don't need the biggest community
- You prefer the Custom / other license terms
- Your stack matches TypeScript
- You evaluated both and Langfuse fits your workflow better
About PageIndex
PageIndex is a vectorless, reasoning based retrieval augmented generation engine written in Python and released under the MIT license. It lives in the AI and machine learning infrastructure ecosystem, with topics spanning RAG, information retrieval, LLM reasoning, context engineering, and agentic AI. Instead of building a vector index, PageIndex generates a hierarchical tree index for each document and then lets a large language model reason its way through that tree, in the same way a human expert turns to the right section of a long report. The project ships as a Python SDK, a hosted cloud service, and a docume…
read the full PageIndex overview →
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 →
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Frequently asked questions
Is PageIndex or Langfuse more popular?
PageIndex has 35,678 GitHub stars and Langfuse has 34,729. PageIndex has the larger community by that measure.
Are PageIndex and Langfuse free?
Both are open source. PageIndex is licensed under MIT, and Langfuse has no licence declared in this registry. Both are free to self-host.
What is the difference between PageIndex and Langfuse?
PageIndex is written in Python and Langfuse in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, PageIndex or Langfuse?
Choose PageIndex if you want the larger community (35,678 stars) or its MIT licence terms. Choose Langfuse if its feature set, stack or Custom / other licence fits better. Both are self-hostable.