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APIs · head to head

Directus vs Doxygen

Directus logo

Directus

APIs

Open-source data platform providing REST and GraphQL APIs

From
Free
Rated
-
Full reviewWebsite
Doxygen logo

Doxygen

Documentation

Free, open source documentation generator that builds reference docs from source code comments

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Directus free permissive use of the self hosted product is limited to organisations under $5M annual revenue with fewer than 50 employees, so crossing either threshold turns a free dependency into a paid licence; Doxygen there is no vendor or paid support contract; when something breaks in a large or unusual codebase, the only recourse is community mailing lists, forums or reading the source
  • They diverge on capability: Directus covers REST API, Doxygen covers Code comment parsing.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Directus and Doxygen actually diverge.

Attributes where Directus and Doxygen differ
AttributeDirectusDoxygen
Pricing modelopen-sourceOpen source, no licence fee
PlatformsNode.js, Cloud, Self-hosted, DockerLinux, macOS, Windows
CategoryAPIsDocumentation
Founded2014Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Directus

  • REST API
  • GraphQL API
  • Database management
  • PostgreSQL
  • MySQL
  • SQLite
  • Webhooks
  • Node.js support

Only in Doxygen

  • Code comment parsing
  • Multi-format output
  • Call and inheritance graphs
  • Markdown support
  • CI-friendly build

What people use each for

The jobs each tool is most often brought in to do.

Directus

  • Wrapping an existing SQL database in a REST and GraphQL API with an admin interfacenot Doxygen
  • Running a self hosted headless CMS over a schema you already ownnot Doxygen

Doxygen

  • An engineering team generating API reference documentation directly from source code comments as part of a CI buildnot Directus
  • A library or SDK maintainer who wants reference docs that cannot drift out of sync with the code because they are generated from itnot Directus
  • An internal platform team documenting a large C++ or Java codebase where structure like class hierarchies and call graphs matters more than prosenot Directus
  • A project with no documentation budget that still needs professional-looking reference output without any licence costnot Directus

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Directus

  • Free permissive use of the self hosted product is limited to organisations under $5M annual revenue with fewer than 50 employees, so crossing either threshold turns a free dependency into a paid licence
  • The free Core tier is a hard limit of 3 seats, 25 collections and 5 flows
  • The Team plan is $499 a month billed annually, or $599 monthly, with extra seats at $50 each
  • Team caps collections at 50, expandable to 100, and flows at 20

Doxygen

  • There is no vendor or paid support contract; when something breaks in a large or unusual codebase, the only recourse is community mailing lists, forums or reading the source
  • Default HTML output looks dated and requires a third-party theme such as Doxygen Awesome to look acceptable to a modern audience, which is extra setup work not included
  • It only generates reference documentation from code comments; it is not a narrative documentation tool, help centre or CCMS, so most teams need a separate tool for guides and tutorials
  • Comment syntax and configuration have a real learning curve, and inconsistent comment discipline across a team produces inconsistent or sparse output regardless of the tool
  • Multi-language support varies in depth; parsing quality for languages outside its C-family core (C++, C, C#, Objective-C) is generally weaker than for its primary targets
  • There is no built-in hosting, search analytics, or reader-facing help centre features, so publishing the generated docs anywhere usable still requires separate infrastructure

Pricing, plan by plan

Directus

Free
  • CommunityFree
    • Self-hosted Directus
    • Community support
  • Cloud$25/monthly
    • Managed cloud
    • Automatic updates
    • Backups

Doxygen

Free
  • DoxygenFree
    • Full functionality
    • No usage limits
    • Community mailing list and GitHub issue support

Which should you pick?

Choose Directus if

  • You need rest api.
  • You want to start without paying.
  • You work on Node.js, Cloud, Self-hosted, Docker.
  • You also want graphql api.
Directus review

Choose Doxygen if

  • You need code comment parsing.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want multi-format output.
Doxygen review

Questions people ask

Is Directus or Doxygen better?
Neither clearly leads. Directus starts at Free and Doxygen at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Directus or Doxygen?
Directus starts at Free and Doxygen at Free.
Does Directus or Doxygen run on more platforms?
Directus runs on Node.js, Cloud, Self-hosted, Docker. Doxygen runs on Linux, macOS, Windows.
Can I use Directus for free?
Both have a free tier, so you can try either at no cost before committing.
What is Directus best used for?
Directus is most often used for wrapping an existing sql database in a rest and graphql api with an admin interface, running a self hosted headless cms over a schema you already own. Of those, wrapping an existing sql database in a rest and graphql api with an admin interface and running a self hosted headless cms over a schema you already own are not what Doxygen is typically brought in for.
What can Directus do that Doxygen cannot?
Directus covers REST API, GraphQL API, Database management, PostgreSQL. Doxygen covers Code comment parsing, Multi-format output, Call and inheritance graphs, Markdown support.

Answered from the vendors’ own pages

Directus: What is Directus's pricing?

Directus Core is free and self-hosted. The Team tier costs $499/month (annual) or $599/month (rolling), including 10 user seats and cloud hosting at $99/month additional. Enterprise plans have custom pricing. Additional seats cost $50/month each.

Source
Doxygen: Is Doxygen really free with no paid tier?

Yes, it is GPL-licensed open source software with no company selling licences or support contracts.

Directus: Can I use Directus for free?

Yes, Directus Core is completely free with 3 user seats, 25 Collections, 5 Flows, AI Assistant, and Advanced RBAC. Self-hosting is available at no cost.

Source
Doxygen: Does Doxygen write documentation for me?

No, it extracts and formats documentation from comments a developer has already written in the source code; it does not generate prose from uncommented code.

Directus: How many user seats does each Directus tier include?

Core includes 3 user seats, Team includes 10 SSO seats, and Enterprise includes custom SSO seat counts. Additional Team seats cost $50/seat per month.

Source
Doxygen: Can it produce anything besides reference documentation?

It can render standalone markdown pages alongside the generated reference content, but it is not a general authoring or publishing platform.

Directus: What happens to my monthly Directus plan if I switch?

Monthly plans are grandfathered for six months after switching, and annual plans are honored until renewal. Self-hosted licenses are handled case-by-case at renewal.

Source
Directus: Is there a free trial for Directus?

No trial period is mentioned. Users can start with the free Core tier immediately without a credit card.

Source
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