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AsyncAPI Generator vs Natural Docs

Both stand on documentation generators. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

AsyncAPI Generator

Free plan LinuxSelf-hosted

AsyncAPI Generator offers a free way to create API-related documentation and code from documents and templates, with scope shaped by the selected template. Its built-in templates carry a production-use caveat, so teams may need to create or extend templates.

Visit AsyncAPI Generator

Natural Docs

Free plan LinuxMacWindows

Natural Docs offers a free way to generate navigable HTML documentation from code comments and text files. Its language coverage, local viewing, and AGPL terms are key considerations.

Visit Natural Docs

The facts

AsyncAPI GeneratorNatural Docs
Free planYesYes
Open sourceNot publishedNot published
Runs onLinux, Self-hostedLinux, Mac, Windows
Lowest paid planFree or on requestFree or on request
Plans published11
MakerNot publishedNot published
Websiteasyncapi.comnaturaldocs.org
On documentation generators#5 of 37#9 of 37

AsyncAPI Generator: what it does well

  • Generates documentation, code, diagrams, and other defined outputs.
  • Supports custom templates and extensions to existing templates.
  • Can scaffold API provider project structure and handler files.
  • Offers npm and Docker installation options.
  • Can be integrated into CI/CD pipelines.

What to know first

  • Baked-in templates are experimental and limited in number.
  • Built-in templates are not recommended for production use.
  • Requires Node.js v18.12.0 or higher and npm v8.19.0 or higher.

Natural Docs: what it does well

  • Free plan listed as free
  • Supports API reference generation and HTML output
  • Configured for 25 languages and extendable
  • Generated documentation works from a local hard drive
  • Can read Javadoc and Microsoft XML comments for some languages

What to know first

  • Output format is HTML
  • AGPL source-availability terms apply to certain uses
  • Runs as a command-line application

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