mdBook vs Redocly

mdBook is a free command-line tool for creating books from Markdown, including product and API documentation, tutorials, and course materials. It builds static output files in a book directory that can be transferred to a web service. Integrated search and syntax highlighting for code blocks help readers navigate and read examples, while theme files allow formatting changes. Preprocessors can add custom syntax or modify content; backends can render output to multiple formats. The `mdbook test` command tests Rust code samples in a book. Project documentation describes using GitHub Actions or GitLab CI/CD to test and deploy books automatically. Developers can also import mdBook libraries or use its plugin mechanism to build custom tooling and output backends. It runs on Linux, macOS, and Windows, and Markdown is its source input. Building from source requires Rust and Cargo, with Rust 1.88 as the stated minimum. The project directs issues and feature requests to its GitHub issue tracker and relies on community contributions for bug fixes and added features. The free, open-source plan is licensed under MPL-2.0.

Redocly is an API documentation and governance suite for teams creating, maintaining, and monitoring API experiences. Redoc generates reference documentation from OpenAPI definitions, with automatic code samples, mock servers, and interactive testing through Replay. Reunite supports collaborative editing, visual reviews, remote content, and deployment previews with an audit trail; it connects to GitHub, GitLab, Azure DevOps, or Redocly’s native Git solution. The open-source CLI validates, lints, and bundles OpenAPI definitions, while the VS Code extension helps write and maintain them and flags definition errors. Reef provides a searchable internal API catalog with metadata, scorecards, and discovery features. Respect monitors APIs against an OpenAPI specification and can send alerts through Slack or email. Redocly lists web, API, and extension platforms, custom domains, and content analytics. It says data is encrypted in transit and at rest and reports a completed SOC 2 Type II audit. Pro costs $10.00 per seat/month, billed monthly, and includes one project and 100 pages. API docs can be launched for free, and the full suite has a 30-day trial.