head to head · open source
GPT4All vs Langfuse
GPT4All has 77,399 GitHub stars, 8,291 forks, 771 open issues and last shipped 1.3 years ago. Langfuse has 34,729 stars, 3,785 forks, 926 open issues and last shipped yesterday. GPT4All leads on adoption by 123% (77,399 vs 34,729 stars). GPT4All is written in C++ under MIT; Langfuse is written in TypeScript under a custom or non-standard licence. GPT4All has attracted 11% 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.
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
| GPT4All | Langfuse | |
|---|---|---|
| GitHub stars | ★ 77K | ★ 35K |
| License | MIT | Custom / other |
| Written in | C++ | TypeScript |
| Last push | 2025-05-27 | 2026-09-17 |
| Forks | ⑂ 8.3K | ⑂ 3.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GPT4All if
- You weight community size — 77K stars and counting
- You want the MIT license terms
- Your stack matches C++
- 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 GPT4All
GPT4All is an MIT licensed C++ chat application and Python client from Nomic that runs large language models privately on everyday desktops and laptops, built for developers and teams who want local inference without API calls, GPUs, or sending data off device.
read the full GPT4All 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 GPT4All or Langfuse more popular?
GPT4All has 77,399 GitHub stars and Langfuse has 34,729. GPT4All has the larger community by that measure.
Are GPT4All and Langfuse free?
Both are open source. GPT4All is licensed under MIT, and Langfuse has no licence declared in this registry. Both are free to self-host.
What is the difference between GPT4All and Langfuse?
GPT4All is written in C++ 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, GPT4All or Langfuse?
Choose GPT4All if you want the larger community (77,399 stars) or its MIT licence terms. Choose Langfuse if its feature set, stack or Custom / other licence fits better. Both are self-hostable.