--- title: "litmus vs langfuse" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/google-litmus-vs-langfuse-langfuse" tools: ["google-litmus", "langfuse-langfuse"] --- # litmus vs langfuse *GraphCanon updated Sep 20, 2026* ## Verdict Pick litmus if litmus is an extensive GenAI application development platform for testing and evaluating LLM performance, featuring a user-friendly UI and deployment flexibility via CLI or manual setup; pick langfuse if langfuse is an open-source platform for evaluating and monitoring large language model applications, offering self-hosting options for local, VM, and Kubernetes environments. [litmus](https://google.github.io/litmus/) reports 52 GitHub stars, 9 forks, and 5 open issues, last pushed Mar 29, 2026. [langfuse](https://langfuse.com) has 35k stars, 3.8k forks, and 906 open issues, last pushed Sep 18, 2026. Figures are from public GitHub metadata via [litmus's repository](https://github.com/google/litmus) and [langfuse's repository](https://github.com/langfuse/langfuse). | | [litmus](/tools/google-litmus.md) | [langfuse](/tools/langfuse-langfuse.md) | | --- | --- | --- | | Tagline | A comprehensive LLM testing and evaluation tool for GenAI application development with user-friendly UI | Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform. | | Stars | 52 | 34,763 | | Forks | 9 | 3,793 | | Open issues | 5 | 906 | | Language | Vue | TypeScript | | Adopt for | Litmus is an extensive GenAI application development platform for testing and evaluating LLM performance, featuring a user-friendly UI and deployment flexibility via CLI or manual setup. | Langfuse is an open-source platform for evaluating and monitoring large language model applications, offering self-hosting options for local, VM, and Kubernetes environments. | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | Other | | Categories | Evaluation & Observability, Model Training | Evaluation & Observability | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [litmus](/tools/google-litmus.md) | [langfuse](/tools/langfuse-langfuse.md) | | --- | --- | --- | | Maintenance | Slowing (36%) | Very active (96%) | | Days since push | 164d | 0d | | Open issues (now) | 5 | 906 | | Stars delta | +1 (30d) | +2.5k (30d) | | Open issues delta | 0 (30d) | +197 (30d) | | Full report | [trust report](/tools/google-litmus/trust.md) | [trust report](/tools/langfuse-langfuse/trust.md) | ## Decision facts: litmus - **Adopt for:** Litmus is an extensive GenAI application development platform for testing and evaluating LLM performance, featuring a user-friendly UI and deployment flexibility via CLI or manual setup. ## Decision facts: langfuse - **Adopt for:** Langfuse is an open-source platform for evaluating and monitoring large language model applications, offering self-hosting options for local, VM, and Kubernetes environments. ## Choose when ### Choose litmus if… - litmus is primarily Vue; langfuse is TypeScript. - License: litmus is Apache-2.0, langfuse is Other. - Tags unique to litmus: api, apitesting, cicd, devops. - Also covers Model Training. - When deploying on Google Cloud with the need for CLI ease of use ### Choose langfuse if… - langfuse is primarily TypeScript; litmus is Vue. - License: langfuse is Other, litmus is Apache-2.0. - Tags unique to langfuse: analytics, evaluation, llm-observability, monitoring. - langfuse ships Docker support for self-hosted deployment. - When you need a self-hosted solution for evaluating and monitoring large language model applications, as Langfuse supports local, VM, and Kubernetes environments. ## When NOT to use litmus - In environments not using Google Cloud services and APIs - When manual setup for each component outweighs potential benefits of automation provided by Litmus CLI ## When NOT to use langfuse - If you are looking for a fully managed service without the need for self-hosting, as Langfuse requires setting up and maintaining the infrastructure yourself. - When you need enterprise features that are not covered by the open-source version, as the `ee` folders are not open-source and may require additional licensing or services. ## Common questions ### What is the difference between litmus and langfuse? litmus: A comprehensive LLM testing and evaluation tool for GenAI application development with user-friendly UI. langfuse: Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.. See the comparison table for live GitHub stats and shared categories. ### When should I choose litmus over langfuse? Choose litmus over langfuse when litmus is primarily Vue; langfuse is TypeScript; License: litmus is Apache-2.0, langfuse is Other; Tags unique to litmus: api, apitesting, cicd, devops; Also covers Model Training; When deploying on Google Cloud with the need for CLI ease of use. ### When should I choose langfuse over litmus? Choose langfuse over litmus when langfuse is primarily TypeScript; litmus is Vue; License: langfuse is Other, litmus is Apache-2.0; Tags unique to langfuse: analytics, evaluation, llm-observability, monitoring; langfuse ships Docker support for self-hosted deployment; When you need a self-hosted solution for evaluating and monitoring large language model applications, as Langfuse supports local, VM, and Kubernetes environments. ### When should I avoid litmus? In environments not using Google Cloud services and APIs When manual setup for each component outweighs potential benefits of automation provided by Litmus CLI ### When should I avoid langfuse? If you are looking for a fully managed service without the need for self-hosting, as Langfuse requires setting up and maintaining the infrastructure yourself. When you need enterprise features that are not covered by the open-source version, as the `ee` folders are not open-source and may require additional licensing or services. ### Is litmus or langfuse more popular on GitHub? langfuse has more GitHub stars (34,763 vs 52). Stars measure visibility, not whether either tool fits your constraints. ### Are litmus and langfuse open source? Yes - both are open-source projects on GitHub (litmus: Apache-2.0, langfuse: Other). ### Where can I find alternatives to litmus or langfuse? GraphCanon lists graph-backed alternatives at [litmus alternatives](/tools/google-litmus/alternatives) and [langfuse alternatives](/tools/langfuse-langfuse/alternatives) ([litmus markdown twin](/tools/google-litmus/alternatives.md), [langfuse markdown twin](/tools/langfuse-langfuse/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/google-litmus-vs-langfuse-langfuse.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, litmus or langfuse? litmus: Slowing. langfuse: Very active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for litmus and langfuse? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [litmus trust report](/tools/google-litmus/trust); [langfuse trust report](/tools/langfuse-langfuse/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=google-litmus`](/api/graphcanon/graph?tool=google-litmus) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_