Asciidoctor vs Redocly

Asciidoctor is a free, open-source text processor and publishing toolchain for converting AsciiDoc files or strings into formats such as HTML5, DocBook, PDF, EPUB 3 and manual pages. Its core includes converters for HTML5, DocBook 5 and man pages; PDF and EPUB 3 conversion comes from separate gems. Documents can be processed through a command-line interface or Ruby API. Asciidoctor runs with Ruby, on the JVM through AsciidoctorJ, or in JavaScript environments through Asciidoctor.js, and supports Linux, macOS and Windows. The wider ecosystem includes Maven and Gradle plugins, browser and editor extensions, and diagram tools. Default HTML output includes a stylesheet and integrations such as Font Awesome, highlight.js, Rouge, Pygments and MathJax. It is distributed as a RubyGem, Docker image, Linux packages and macOS packages, and is licensed under MIT. Its security modes include SECURE, SAFE, SERVER and UNSAFE; safe modes do not sanitize generated output or provide a comprehensive security framework.

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.