ReadMe alternative for versioned API docs

If you mean an alternative to ReadMe for versioned API documentation, here are some solid options depending on what you need:

Popular alternatives

• Stoplight

  • Good for OpenAPI-first docs, versioning, mock servers, and design tools.
  • Strong choice if you want docs + API design in one platform.

• Redoc / Redocly

  • Great-looking docs built from OpenAPI.
  • Strong support for versioned docs, portals, and developer experience.

• SwaggerHub

  • Good for API design, documentation, and version management.
  • Best if your team already uses Swagger/OpenAPI heavily.

• GitBook

  • Flexible documentation platform.
  • Works well if you want docs with manuals, guides, and versioned content, not just API reference.

• Mintlify

  • Modern developer docs platform with versioning support.
  • Popular for clean, fast API docs.

• Docusaurus

  • Open source and highly customizable.
  • Good if you want full control and can manage hosting/deployment yourself.

• MkDocs + Material

  • Simple, powerful, and great for technical docs.
  • Versioning possible via plugins or deployment setup.

Best picks by use case

• Best overall ReadMe replacement for API docs: Stoplight or Redocly
• Best for beautiful docs fast: Mintlify or Redoc
• Best open-source/customizable option: Docusaurus or MkDocs
• Best for broader product docs + API docs: GitBook

If versioning is the key requirement

Make sure the tool supports:

• multiple API versions side by side
• version selector in the UI
• OpenAPI import/export
• changelogs or release notes
• stable URLs per version

If you want, I can also give you:

1. a feature comparison table,
2. free/open-source alternatives only, or
3. the best choice for a SaaS startup vs enterprise.