--- title: "litmus vs evals" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/google-litmus-vs-openai-evals" tools: ["google-litmus", "openai-evals"] --- # litmus vs evals *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 evals if evals is an evaluation framework from OpenAI for assessing large language models and systems built with them. It includes an open-source registry of benchmarks and tools to create. [litmus](https://google.github.io/litmus/) reports 52 GitHub stars, 9 forks, and 5 open issues, last pushed Mar 29, 2026. [evals](https://github.com/openai/evals) has 19k stars, 3.1k forks, and 333 open issues, last pushed Apr 14, 2026. Figures are from public GitHub metadata via [litmus's repository](https://github.com/google/litmus) and [evals's repository](https://github.com/openai/evals). | | [litmus](/tools/google-litmus.md) | [evals](/tools/openai-evals.md) | | --- | --- | --- | | Tagline | A comprehensive LLM testing and evaluation tool for GenAI application development with user-friendly UI | Framework for evaluating LLMs and LLM systems with an open-source registry of benchmarks. | | Stars | 52 | 19,398 | | Forks | 9 | 3,077 | | Open issues | 5 | 333 | | Language | Vue | Python | | 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. | Evals is an evaluation framework from OpenAI for assessing large language models and systems built with them. It includes an open-source registry of benchmarks and tools to create custom evaluations. | | 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) | [evals](/tools/openai-evals.md) | | --- | --- | --- | | Days since push | 164d | 145d | | Open issues (now) | 5 | 333 | | Stars delta | +1 (30d) | +271 (30d) | | Open issues delta | 0 (30d) | +120 (30d) | | Full report | [trust report](/tools/google-litmus/trust.md) | [trust report](/tools/openai-evals/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: evals - **Adopt for:** Evals is an evaluation framework from OpenAI for assessing large language models and systems built with them. It includes an open-source registry of benchmarks and tools to create custom evaluations. ## Choose when ### Choose litmus if… - litmus is primarily Vue; evals is Python. - License: litmus is Apache-2.0, evals 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 evals if… - evals is primarily Python; litmus is Vue. - License: evals is Other, litmus is Apache-2.0. - Tags unique to evals: benchmarking, custom eval creation, evaluation-framework, large-language-models. - * When you need a comprehensive set of pre-existing evals and the ability to create your own tailored tests using specific use cases, especially within the OpenAI model ecosystem. ## 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 evals - * When evaluating models or systems that do not benefit from being integrated with the OpenAI API, as some features like direct evals configuration in the OpenAI Dashboard require an OpenAI key. - * If you are looking for an evaluation framework that doesn’t involve external dependencies such as Git Large File Storage (LFS) and specific Python version requirements (Python 3.9 minimum), or if a ## Common questions ### What is the difference between litmus and evals? litmus: A comprehensive LLM testing and evaluation tool for GenAI application development with user-friendly UI. evals: Framework for evaluating LLMs and LLM systems with an open-source registry of benchmarks.. See the comparison table for live GitHub stats and shared categories. ### When should I choose litmus over evals? Choose litmus over evals when litmus is primarily Vue; evals is Python; License: litmus is Apache-2.0, evals 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 evals over litmus? Choose evals over litmus when evals is primarily Python; litmus is Vue; License: evals is Other, litmus is Apache-2.0; Tags unique to evals: benchmarking, custom eval creation, evaluation-framework, large-language-models; * When you need a comprehensive set of pre-existing evals and the ability to create your own tailored tests using specific use cases, especially within the OpenAI model ecosystem. ### 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 evals? * When evaluating models or systems that do not benefit from being integrated with the OpenAI API, as some features like direct evals configuration in the OpenAI Dashboard require an OpenAI key. * If you are looking for an evaluation framework that doesn’t involve external dependencies such as Git Large File Storage (LFS) and specific Python version requirements (Python 3.9 minimum), or if a ### Is litmus or evals more popular on GitHub? evals has more GitHub stars (19,398 vs 52). Stars measure visibility, not whether either tool fits your constraints. ### Are litmus and evals open source? Yes - both are open-source projects on GitHub (litmus: Apache-2.0, evals: Other). ### Where can I find alternatives to litmus or evals? GraphCanon lists graph-backed alternatives at [litmus alternatives](/tools/google-litmus/alternatives) and [evals alternatives](/tools/openai-evals/alternatives) ([litmus markdown twin](/tools/google-litmus/alternatives.md), [evals markdown twin](/tools/openai-evals/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-openai-evals.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, litmus or evals? litmus: Slowing. evals: Slowing. 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 evals? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [litmus trust report](/tools/google-litmus/trust); [evals trust report](/tools/openai-evals/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/_