> For the complete documentation index, see [llms.txt](https://docs.layerlens.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.layerlens.ai/1.-introduction.md).

# 1. Introduction

- [What is LayerLens?](https://docs.layerlens.ai/1.-introduction/what-is-layerlens.md): LayerLens is the AI evaluation platform — private workspace and SDK.
- [Overview](https://docs.layerlens.ai/1.-introduction/01-introduction.md): Overview of LayerLens — the workspace and SDK, the workflow spine, what's in the platform.
- [Why evaluate?](https://docs.layerlens.ai/1.-introduction/why-evaluate.md): Why AI teams need evaluation discipline — the cost of shipping unmeasured AI.
- [Personas and paths](https://docs.layerlens.ai/1.-introduction/personas-paths.md): Five personas, five paths — Builder, Operator, Researcher, Admin, Buyer.
- [Workspace and SDK](https://docs.layerlens.ai/1.-introduction/three-experiences.md): The LayerLens workspace and the Python SDK — what each one is for and how they work together.
- [The LayerLens Workflow — the six intents](https://docs.layerlens.ai/1.-introduction/the-layerlens-workflow.md): The LayerLens Workflow — six stages from picking a model to governing it in production.
- [How LayerLens compares](https://docs.layerlens.ai/1.-introduction/how-layerlens-compares.md): LayerLens vs Braintrust, LangSmith, Galileo, Promptfoo, Arize — the short version.
- [Deep comparison](https://docs.layerlens.ai/1.-introduction/how-layerlens-compares-deep.md): LayerLens vs Braintrust, LangSmith, Galileo, Promptfoo, Arize — feature-by-feature comparison.