--- title: "litmus vs openlit" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/google-litmus-vs-openlit-openlit" tools: ["google-litmus", "openlit-openlit"] --- # litmus vs openlit *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 openlit if openLIT is an open-source observability and evaluation platform for AI and coding agents, leveraging OpenTelemetry for tracking performance and costs. [litmus](https://google.github.io/litmus/) reports 52 GitHub stars, 9 forks, and 5 open issues, last pushed Mar 29, 2026. [openlit](https://docs.openlit.io) has 2.8k stars, 390 forks, and 77 open issues, last pushed Sep 17, 2026. Figures are from public GitHub metadata via [litmus's repository](https://github.com/google/litmus) and [openlit's repository](https://github.com/openlit/openlit). | | [litmus](/tools/google-litmus.md) | [openlit](/tools/openlit-openlit.md) | | --- | --- | --- | | Tagline | A comprehensive LLM testing and evaluation tool for GenAI application development with user-friendly UI | Open-source observability & evaluation platform for AI agents and coding agents | | Stars | 52 | 2,770 | | Forks | 9 | 390 | | Open issues | 5 | 77 | | 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. | OpenLIT is an open-source observability and evaluation platform for AI and coding agents, leveraging OpenTelemetry for tracking performance and costs. | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | Apache-2.0 | | Categories | Evaluation & Observability, Model Training | Evaluation & Observability | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [litmus](/tools/google-litmus.md) | [openlit](/tools/openlit-openlit.md) | | --- | --- | --- | | Maintenance | Slowing (36%) | Very active (96%) | | Days since push | 164d | 0d | | Open issues (now) | 5 | 77 | | Stars delta | +1 (30d) | +106 (30d) | | Open issues delta | 0 (30d) | +29 (30d) | | Full report | [trust report](/tools/google-litmus/trust.md) | [trust report](/tools/openlit-openlit/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: openlit - **Pricing:** freemium - OpenLIT is free and open-source under the Apache License 2.0. - **Requirements:** Installation is available via pip for Python and npm for TypeScript. - **Adopt for:** OpenLIT is an open-source observability and evaluation platform for AI and coding agents, leveraging OpenTelemetry for tracking performance and costs. - **License detail:** Apache-2.0 ## Choose when ### Choose litmus if… - litmus is primarily Vue; openlit is TypeScript. - 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 openlit if… - openlit is primarily TypeScript; litmus is Vue. - Pricing: OpenLIT is free and open-source under the Apache License 2.0.. - Requirements: Installation is available via pip for Python and npm for TypeScript.. - Tags unique to openlit: ai-engineering, ai-evaluation, ai-observability, ai-observability-platform. - openlit ships Docker support for self-hosted deployment. - When you need to track and evaluate the performance and costs of AI and coding agents using OpenTelemetry. ## 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 openlit - If your project does not require observability and evaluation features for AI and coding agents. - When you prefer proprietary tools over open-source solutions. - If your project does not involve AI applications or does not need detailed cost tracking across multiple dimensions. ## Common questions ### What is the difference between litmus and openlit? litmus: A comprehensive LLM testing and evaluation tool for GenAI application development with user-friendly UI. openlit: Open-source observability & evaluation platform for AI agents and coding agents. See the comparison table for live GitHub stats and shared categories. ### When should I choose litmus over openlit? Choose litmus over openlit when litmus is primarily Vue; openlit is TypeScript; 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 openlit over litmus? Choose openlit over litmus when openlit is primarily TypeScript; litmus is Vue; Pricing: OpenLIT is free and open-source under the Apache License 2.0.; Requirements: Installation is available via pip for Python and npm for TypeScript.; Tags unique to openlit: ai-engineering, ai-evaluation, ai-observability, ai-observability-platform; openlit ships Docker support for self-hosted deployment; When you need to track and evaluate the performance and costs of AI and coding agents using OpenTelemetry. ### 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 openlit? If your project does not require observability and evaluation features for AI and coding agents. When you prefer proprietary tools over open-source solutions. If your project does not involve AI applications or does not need detailed cost tracking across multiple dimensions. ### Is litmus or openlit more popular on GitHub? openlit has more GitHub stars (2,770 vs 52). Stars measure visibility, not whether either tool fits your constraints. ### Are litmus and openlit open source? Yes - both are open-source projects on GitHub (litmus: Apache-2.0, openlit: Apache-2.0). ### Where can I find alternatives to litmus or openlit? GraphCanon lists graph-backed alternatives at [litmus alternatives](/tools/google-litmus/alternatives) and [openlit alternatives](/tools/openlit-openlit/alternatives) ([litmus markdown twin](/tools/google-litmus/alternatives.md), [openlit markdown twin](/tools/openlit-openlit/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-openlit-openlit.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, litmus or openlit? litmus: Slowing. openlit: 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 openlit? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [litmus trust report](/tools/google-litmus/trust); [openlit trust report](/tools/openlit-openlit/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/_