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Documentation · head to head

Doxygen vs Gravitee

Doxygen logo

Doxygen

Documentation

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

From
Free
Rated
-
Full reviewWebsite
Gravitee logo

Gravitee

APIs

Open source API management platform for event-native APIs

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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; Gravitee the entry paid API management tier is $2,500 a month and includes a single production gateway
  • They diverge on capability: Doxygen covers Code comment parsing, Gravitee covers API Gateway.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Doxygen and Gravitee actually diverge.

Attributes where Doxygen and Gravitee differ
AttributeDoxygenGravitee
Pricing modelOpen source, no licence feefreemium
PlatformsLinux, macOS, WindowsCloud, On-premise, Kubernetes
CategoryDocumentationAPIs
FoundedUnknown2015

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 Doxygen

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

Only in Gravitee

  • API Gateway
  • Developer Portal
  • Analytics Dashboard
  • Kubernetes
  • Docker
  • Kafka
  • LDAP
  • Cloud support

What people use each for

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

Doxygen

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

Gravitee

  • API gateway and lifecycle managementnot Doxygen
  • Exposing Kafka event streams as managed APIsnot Doxygen
  • Protocol mediation between event brokers and clientsnot Doxygen
  • Self-hosting an open source API gatewaynot Doxygen
  • Access control and authentication in front of internal APIsnot Doxygen

Where each one falls short

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

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

Gravitee

  • The entry paid API management tier is $2,500 a month and includes a single production gateway
  • Event management is priced separately, starting at $1,250 a month for the Comet tier
  • Tiers are gated on gateway and broker counts, so scaling horizontally means moving tier rather than paying incrementally
  • Data logging masking and other enterprise features are withheld from the lowest paid tier
  • 24/7 support requires the top Universe tier

Pricing, plan by plan

Doxygen

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

Gravitee

Free
  • CommunityFree
    • API Gateway
    • Basic analytics
    • Community support
  • Enterprise$1500/monthly
    • Advanced features
    • SLA support
    • SSO integration
  • Custom$undefined/monthly
    • Custom deployment
    • Dedicated support
    • Premium SLA

Which should you pick?

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

Choose Gravitee if

  • You need api gateway.
  • You want to start without paying.
  • You work on Cloud, On-premise, Kubernetes.
  • You also want developer portal.
Gravitee review

Questions people ask

Is Doxygen or Gravitee better?
Neither clearly leads. Doxygen starts at Free and Gravitee at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Doxygen or Gravitee?
Doxygen starts at Free and Gravitee at Free.
Does Doxygen or Gravitee run on more platforms?
Doxygen runs on Linux, macOS, Windows. Gravitee runs on Cloud, On-premise, Kubernetes.
Can I use Doxygen for free?
Both have a free tier, so you can try either at no cost before committing.
What is Doxygen best used for?
Doxygen is most often used for an engineering team generating api reference documentation directly from source code comments as part of a ci build, a library or sdk maintainer who wants reference docs that cannot drift out of sync with the code because they are generated from it, an internal platform team documenting a large c++ or java codebase where structure like class hierarchies and call graphs matters more than prose, a project with no documentation budget that still needs professional-looking reference output without any licence cost. Of those, an engineering team generating api reference documentation directly from source code comments as part of a ci build and a library or sdk maintainer who wants reference docs that cannot drift out of sync with the code because they are generated from it are not what Gravitee is typically brought in for.
What can Doxygen do that Gravitee cannot?
Doxygen covers Code comment parsing, Multi-format output, Call and inheritance graphs, Markdown support. Gravitee covers API Gateway, Developer Portal, Analytics Dashboard, Kubernetes.

Answered from the vendors’ own pages

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.

Gravitee: What is Gravitee's pricing model?

Gravitee uses a tiered subscription model with monthly flat pricing. The Planet tier for API Management starts at $2,500/month with one production gateway, while the Comet tier for Event Management starts at $1,250/month.

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.

Gravitee: Are there hidden fees with Gravitee?

No. Gravitee explicitly states there are no hidden fees, and all tiers include unlimited users and unlimited APIs under management.

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.

Gravitee: What does higher tier pricing include in Gravitee?

Higher tiers add more production gateways, enterprise plugins, and enhanced support levels ranging from Gold to Platinum/Diamond support.

Source
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