This guide reviews the top API documentation tools of 2025, categorizing them into end-to-end platforms, API reference generators, tools with embedded documentation, and static site generators. Each tool is evaluated based on its ability to auto-generate documentation, facilitate live collaboration, integrate with Git workflows, offer robust search functionality, and enhance the developer experience. The evaluation aims to assist teams in selecting the most suitable documentation tools that align with their workflows, whether prioritizing automation, customization, or collaboration. Key tools discussed include Mintlify, which balances automation and customization while providing interactive features and AI-powered search; ReadMe, known for its interactive onboarding and collaboration features; GitBook, which emphasizes ease of use for non-technical users; and Docusaurus, which offers high customization for developers familiar with React. Additionally, the guide covers API reference generators such as Swagger UI and Redoc, highlighting their strengths in creating clear, interactive API references. Lastly, it explores tools with embedded documentation capabilities like Postman and Insomnia, as well as static site generators like MkDocs, emphasizing their suitability for different team requirements and technical expertise levels.