18.4
Scalar is a collection of API products for documentation, client generation, API management, requests, and MCP server use.
Free planOpen sourceWebAPILinux
Best API Documentation Tools in 2026
When you’re documenting an API, it helps to compare how each tool turns specifications into guidance developers can use. Compared on API versioning, code samples, custom domain, free plan, hosting model, interactive API reference, OpenAPI import, and paid from, the options cover both documentation features and setup choices. Scalar, Doxygen, and ApiNotes are among the tools to consider. Look at how interactive…
27.8
Fern Docs builds interactive documentation websites from Markdown and API specifications, while Fern also generates strongly typed client libraries.
Free planOpen sourceWebAPILinux
37.5
Theneo is a developer portal platform for publishing API references, guides, changelogs, and private customer portals.
Free planWebAPIExtension
- 4
Redocly
WebAPIExtension7.0From $10 a month - 5
Mihari
Mihari is a cloud observability platform combining uptime monitoring, on-call alerting, telemetry, API documentation, and error tracking.
Free planWeb6.7From €19 a month - 6
ReadMe
Free planWeb6.7From $250 a month - 7
ApiNotes
ApiNotes turns OpenAPI and Swagger specifications into hosted interactive documentation and generates changelogs with alerts for breaking changes.
Free planWeb6.6From $19 a month - 8
Palt
Palt is a hosted platform for creating, publishing, and managing interactive API documentation from OpenAPI specifications.
Free planWeb6.6From $19 a month - 9
PilotDocs
PilotDocs is a hosted platform for creating, managing, and publishing interactive API documentation.
Free planWeb6.6From $49 a month - 10
Endrel
Endrel is a hosted workspace for API documentation that makes specifications searchable and uses AI review to flag documentation drift.
Free planWebAPI6.5From ₹1,499 a month - 11
Javadoc
Javadoc generates HTML API documentation from Java source files and is installed with the Java Development Kit (JDK).
Free planWebLinuxmacOSWindows6.5Free plan - 12
TypeDoc
TypeDoc is a free documentation generator for TypeScript projects.
Free planAPILinuxSelf-hosted6.5Free plan - 13
Bump.sh
Bump.sh is a paid web, API, and self-hosted service for publishing API documentation and providing MCP servers that update with API releases.
WebAPISelf-hosted6.4From $50 a month - 14
Stoplight Elements
Free planWebSelf-hosted6.4Free plan - 15
Doxygen
Doxygen is a free documentation generator that turns source-code comments into documentation and parses classes, functions and variables.
Free planLinuxmacOSWindows6.2Free plan - 16
Apiary
Apiary is a hosted web platform for designing, prototyping, documenting, and testing APIs.
Free planWebAPI6.1Free plan - 17
pdoc
pdoc creates API documentation from Python projects and arranges it according to each project's module hierarchy.
WebLinuxmacOSSelf-hosted6.1 - 18
Zudoku
Zudoku is a free, open-source framework for building API documentation and developer portals around OpenAPI.
Free planWebSelf-hosted6.1Free plan - 19
Miredot
Self-hosted6.0From $15 a month - 20
phpDocumentor
phpDocumentor turns PHP source code and DocBlock comments into API documentation.
Free planLinuxmacOSSelf-hosted6.0Free plan - 21
Widdershins
Widdershins converts API definition files into documentation inputs for rendering pipelines.
Free planAPILinuxSelf-hosted6.0Free plan - 22
RapiDoc
RapiDoc is a responsive web component that renders interactive API documentation from OpenAPI and Swagger specifications.
Free planWebSelf-hosted5.9Free plan - 23
RAML2HTML
RAML2HTML is a free, open-source Node.js package that generates HTML documentation from RAML.
Free planLinuxSelf-hosted5.8Free plan - 24
DapperDox
DapperDox is an open-source API documentation generator and server for OpenAPI (Swagger) specifications.
WebLinuxSelf-hostedWindows5.7 - 25
Swagger2Markup
APILinuxSelf-hosted5.5