Natural Docs is a free, open-source command-line tool that turns specially formatted comments and source code into HTML documentation. Its current language page lists 25 programming languages, not 21 as the older title suggests—but support depth varies: C# has a dedicated parser, while most languages rely mainly on Natural Docs comments.
What is Natural Docs?
Natural Docs scans source files and builds browsable HTML documentation. You write comments in a natural, readable syntax; the tool recognizes documentation topics and, for languages with full support, can also interpret code structure. The project describes this approach on its About page.
It is a command-line generator rather than a hosted documentation service. Project settings and comment or language configuration can be managed through files including Project.txt, Comments.txt, and Languages.txt. The official reference covers command-line use, comments, keywords, scope, formatting, grouping, styles, and configuration.
How to install Natural Docs
The official download page lists Natural Docs 2.3.1 as the current stable release and Natural Docs 2.4 Beta 1 as a separate development release. Choose stable for the published stable line; choose the beta only if you specifically need its newer capabilities and accept beta status.
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| Release | Available packages | Runtime requirements stated by the project |
|---|---|---|
| 2.3.1 stable | Windows installer and a zip archive for all platforms | Windows: .NET 3.5 or later. Linux and macOS: Mono 4.0 or later. |
| 2.4 Beta 1 | Linux, Windows, and macOS options | The download page says the 2.4 development line no longer requires Mono on Linux; consult its package information for other platform details. |
These release and requirement details are those given on the Natural Docs downloads page; check that page for the package currently offered before installing.
- Open the downloads page and select either 2.3.1 stable or 2.4 Beta 1.
- Download the Windows installer if using Windows, or the all-platform zip archive for the stable release. For the beta, choose the package matching your operating system.
- Meet the stated runtime requirement for the selected release and platform.
- Set up a Natural Docs project using its command-line workflow and project configuration, then run the generator against your source files. Use the reference for commands and project settings.
Does Natural Docs support your programming language?
The official language page, accessed in 2026, says Natural Docs supports 25 programming languages. That is the current published count; the “21” in the older title is out of date. The listed languages are ActionScript, Ada, Assembly, C, C++, C#, ColdFusion, Fortran (free-format only), Java, JavaScript, Lua, Makefiles, MSBuild Files, Pascal/Delphi, Perl, PHP, PL/SQL, PowerBuilder, PowerShell, Python, R, Ruby, SystemVerilog, Tcl, Text Files, and Visual Basic.
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The project says additional languages can be added by editing a configuration file. Being on the list does not necessarily mean Natural Docs parses that language’s code structure: the distinction between full and basic support is important when choosing it.
Full support versus basic support
| Support type | What Natural Docs does | What that means for documentation |
|---|---|---|
| Full | A dedicated parser interprets code, recognizes classes, functions, and other elements even without comments, can include inheritance diagrams, supports Javadoc and XML comments where applicable, and follows code-scoping rules. | Useful when you want the generator to understand more of the program structure in addition to your written documentation. |
| Basic | Support is primarily driven by Natural Docs comments. | You need to add Natural Docs comments for each class or function you want included; do not assume automatic code-structure discovery. |
Natural Docs’ language reference identifies C# as having full parser support; most of the other listed languages have basic, comment-driven support. Check the project’s language support reference for the current support classification and details by language.
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What does Natural Docs generate and customize?
Natural Docs generates HTML documentation. Its reference describes controls for formatting, grouping, styles, keywords, and scope, alongside project configuration. That offers ways to organize and present the generated documentation, but the cited project information does not establish a specific theme marketplace or a particular output format beyond HTML.
Release notes also describe repository links that can make generated documentation link back to source hosted on GitHub, GitLab, Codeberg, Gitea, Bitbucket, Azure Repos, and Forgejo. Consult the release notes for the supported integration details relevant to your release.
Is Natural Docs still maintained?
The official downloads page lists 2.3.1 as stable and 2.4 Beta 1 as a development release. The 2.4 beta notes describe native support for Rust, Swift, Kotlin, Go, and TypeScript, as well as improved JavaScript support. That establishes an active published development line, but it does not by itself guarantee a release schedule or a date for a stable 2.4 release. Check the downloads page and release notes for current status.
Is Natural Docs free for commercial use?
Natural Docs is licensed under the GNU Affero General Public License version 3 (AGPLv3). The practical distinction is whether you use the tool to document your own project or incorporate Natural Docs into another product or service.
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- Using the tool to document your project: the project says this does not impose the AGPL on your project, and the generated documentation as a whole is not bound by the AGPL.
- Incorporating Natural Docs source or functionality into a product or service: the license page says the resulting source must be made available under AGPL terms.
For an unusual deployment or a need for different terms or commercial support, consult the official licensing page, which directs businesses to contact Greg Valure. This is general information, not legal advice.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How Natural Docs compares with other documentation generators
The right comparison depends on how much parsing you need and how you want to build and publish documentation. Natural Docs is a reasonable fit if its comment syntax and HTML output suit your workflow; assess these specific trade-offs before adopting it:
- Language depth: verify whether your language has full parser support or basic comment-driven support. The published count of 25 languages does not mean all 25 receive the same level of automatic code analysis.
- Customization: the reference documents formatting, grouping, styles, and project configuration. Compare the degree of control you need with what another generator offers.
- Runtime and installation: the stable 2.3.1 line has stated .NET and Mono requirements; 2.4 Beta 1 changes the Linux runtime requirement. A different generator may fit your platform constraints better.
- Source links: Natural Docs release notes describe links from generated documentation to several hosted repositories. Confirm that the feature works for your repository host and chosen release.
- Release maturity: 2.3.1 is listed as stable; 2.4 Beta 1 is not a stable release. Decide whether beta-only language support is worth that trade-off.
- License: AGPLv3 is compatible with simply documenting your own project according to the project, but incorporating the tool’s source or functionality has broader obligations. Compare licenses before embedding any generator in a product or service.
Natural Docs is therefore most compelling when readable comments, generated HTML, and its supported language workflow match your project. If you need automatic structural coverage across a language for which Natural Docs offers only basic support, compare alternatives on parser depth rather than headline language count.
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