Apidog suits teams that design and test APIs, particularly those using specifications, automated request sequences, or Postman scripts.
Free plan Free trial From $9 a month, billed yearly WebWindowsMacLinuxBrowser extensionAPI+1
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Best API Design Tools 2026
Facts read 20 Sep 2026 – 15 Oct 2026
API design tools support work around describing and coordinating API contracts. Compare OpenAPI and AsyncAPI support with contract validation, mock-server availability, and Git synchronization to see which capabilities match your workflow. Team collaboration and included seats can help you assess how tools accommodate shared work. Free-plan availability and paid-from pricing add cost considerations. Apidog, Apollo Studio, and Microcks are among the entries, alongside OpenAPI Studio and Pact. The listed criteria give you practical dimensions for comparing specification coverage, validation and collaboration features, and access terms as you consider how a tool could fit your team's API design process.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 Apidog | Apidog suits teams that design and test APIs, particularly those using specifications, automated request sequences, or Postman scripts. | 6.0 | $9 a month, billed yearly | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 02 Pact | Pact suits development teams that own both consumer and provider applications and want to check integrations in isolation. | 5.8 | $115.42 a month, billed yearly | Free plan | Windows, Mac, Linux, API | 4 Oct 2026 |
| 03 PactFlow | PactFlow suits teams coordinating contracts across distributed services and source-control workflows. | 5.7 | $115.42 a month, billed yearly | Free plan | Web, Linux, API, Self-hosted | 15 Oct 2026 |
| 04 Postman | Postman suits developers and teams that need API design, testing, documentation, or monitoring tools. | 5.7 | $9 a month, billed yearly | Free plan | Web, Windows, Mac, Linux | 29 Sep 2026 |
| 05 oasdiff | oasdiff suits API teams that need to compare OpenAPI specifications, review changes, and identify breaking changes before release. | 5.4 | $100 a month | Free plan | Web, Windows, Mac, Linux | 1 Oct 2026 |
| 06 SwaggerHub | SwaggerHub suits API teams and cross-functional contributors who need shared design, documentation, testing, or governance workflows. | 5.4 | $740 a year | Free plan | Web, Self-hosted | 29 Sep 2026 |
| 07 Apollo Studio | It suits students or hobbyists starting with GraphQL, as well as API teams that need schema review, usage visibility, or pipeline checks. | 5.3 | $5 usage-based | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 08 OpenAPI Studio | It suits people designing and testing APIs visually, including teams that want recipe-based API calls or MCP connections. | 5.3 | $9 a month | Free plan | Web, Self-hosted | 1 Oct 2026 |
| 09 Assertible | Assertible is aimed at QA professionals, developers and others responsible for operating a web service. | 5.2 | $25 a month | Free plan | Web, API | 9 Oct 2026 |
| 10 Mockoon | 5.2 | €10 a month, billed yearly | Free plan | Web, Windows, Mac, Linux | 4 Oct 2026 |
02
Pact
Pact suits development teams that own both consumer and provider applications and want to check integrations in isolation.
WindowsMacLinux+2 Record5.8 Visit
03
PactFlow
PactFlow suits teams coordinating contracts across distributed services and source-control workflows.
WebLinuxAPI+1 Record5.7 Visit
04
Postman
Postman suits developers and teams that need API design, testing, documentation, or monitoring tools.
WebWindowsMac+2 Record5.7 Visit
05
oasdiff
oasdiff suits API teams that need to compare OpenAPI specifications, review changes, and identify breaking changes before release.
WebWindowsMac+3 Record5.4 Visit
6
SwaggerHub
WebSelf-hosted $740 a year Record5.4 Visit SwaggerHub suits API teams and cross-functional contributors who need shared design, documentation, testing, or governance workflows.
7
Apollo Studio
WebWindowsMac+4 $5 usage-based Record5.3 Visit It suits students or hobbyists starting with GraphQL, as well as API teams that need schema review, usage visibility, or pipeline checks.
8
OpenAPI Studio
WebSelf-hosted $9 a month Record5.3 Visit It suits people designing and testing APIs visually, including teams that want recipe-based API calls or MCP connections.
9
Assertible
WebAPI $25 a month Record5.2 Visit Assertible is aimed at QA professionals, developers and others responsible for operating a web service.
11
Redocly
WebBrowser extensionAPI $10 a month Record5.2 Visit Redocly suits developers, technical writers, product managers, and executives responsible for API documentation or governance.
12
Microcks
WebWindowsMac+4 Free plan Record5.0 Visit Microcks suits API owners, developers, quality assurance teams, and platform engineers who need to mock or test APIs and microservices.
13
TypeSpec
WebWindowsMac+2 Free plan Record5.0 Visit TypeSpec suits developers defining API contracts and data models who want to generate specifications and schemas.
14
WireMock
WebWindowsMac+3 Free plan Record5.0 Visit WireMock Cloud is intended for developers, testers, and AI coding agents building or validating software against simulated APIs.
15
GraphQL Hive
WebAPISelf-hosted $20 a month Record4.9 Visit Hive's Hobby plan is described for personal or small projects, while Pro is aimed at scaling APIs and teams.
16
MockServer
WebWindowsMac+3 Free plan Record4.9 Visit MockServer suits developers and test teams that need self-hosted service virtualization, contract testing, or controlled fault injection.
19
Schemathesis
WindowsMacLinux+1 Free plan Record4.7 Visit Schemathesis suits engineers testing OpenAPI or GraphQL APIs and incorporating checks into CI/CD.
23
Stoplight Elements
WebSelf-hosted Free plan Record4.4 Visit Elements may suit developers who want to add interactive OpenAPI documentation to an existing site or HTML project.
24
Stoplight Prism
WebAPISelf-hosted Free plan Record4.4 Visit Prism suits development teams needing API mocks, contract validation, transformations, or proxy checks.
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