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Doxygen

Free#20 of 28 in API Documentation ToolsDocumentation Generators Technical Writing Platforms

Doxygen: A free, broad source-code documentation generator for local, searchable reference output. Ranked #20 of 28 in API Documentation Tools by our editors (6.7/10); pricing: Free plan; best for teams documenting source code beyond APIs.

6.7/10Editor score

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Doxygen6.7 Visit Doxygen

At a glance

Editor score
6.7 / 10
Pricing
Free plan
Best for
Teams documenting source code beyond APIs
Free plan
Yes
Paid from
Free
Facts checked
20 Sep 2026

Where it wins
- Free and open source across Windows, macOS, and Linux
- Supports multiple languages and several export formats
- Adds diagrams, examples, cross-references, and symbol search
Where it doesn't
- Primarily supports local, self-hosted documentation workflows
- Lacks verified OpenAPI import
- Does not provide interactive API references

Our verdict on Doxygen

Doxygen is a free, open-source documentation generator for software projects. It parses source code and documentation comments to create browsable, cross-referenced documentation for APIs, classes, functions, files, namespaces, and related structures. Its language support includes C, C++, C#, Java, Python, PHP, Fortran, Objective-C, D, and VHDL. It suits development teams that need documentation generated from source code across Windows, macOS, or Linux, particularly when a project extends beyond API reference pages.

The published capabilities cover a wide range of documentation outputs and navigation features. Doxygen can produce HTML, LaTeX, man pages, RTF, XML, DocBook, PDF, and several help formats. HTML output includes full-text and live symbol search, while generated class, collaboration, dependency, call, and hierarchy diagrams help readers navigate relationships in a codebase. Markdown, special documentation commands, syntax-highlighted source-code examples, and cross-references add depth for projects where structure and implementation context matter. Doxywizard provides a graphical configuration frontend, and a Doxyfile makes output configurable.

Doxygen is strongest as a local source-code documentation generator rather than as a hosted OpenAPI documentation platform. Its self-hosted model gives teams control over how documentation is generated and published, but it places that workflow within the project’s own environment. Teams looking for broad language coverage, multiple export formats, diagrams, and searchable browsable output should consider it. Teams that require verified OpenAPI import or interactive API references should choose a tool designed specifically around those capabilities instead.

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Doxygen pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on doxygen.nl

Doxygen fact sheet

Free plan	Yes
Paid from	Free
OpenAPI import	Not verified
Interactive API reference	Not verified
Code samples	Yes
API versioning	Not verified
Custom domain	Not verified
Hosting model	Self_hosted
Deployment	Self-hosted, Desktop
Platforms	Windows, macOS, Linux
Support	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Pricing	Free plan
Website	doxygen.nl
Facts checked	20 Sep 2026

Alternatives to Doxygen

See all Doxygen alternatives →

Also Ranked In

Doxygen is ranked in 3 of our directories.

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Featured on iTechGuides

Doxygen is listed in our API Documentation Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update