Best API Design Tools in 2026
24 api design tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | OpenAPI support | |
|---|---|---|---|---|---|---|---|---|
| 1 | Apidog | 9.0 | RecognisedAPIDocumented | $2.25/mo | Yes | 9 /user/mo | — | View |
| 2 | WireMock | 8.2 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 3 |  oasdiff | 8.0 | RecognisedAPIDocumented | $100/mo | Yes | — | — | View |
| 4 | Redocly | 7.9 | RecognisedAPIDocumented | $10/mo | No | 10 /user/mo | — | View |
| 5 | Apollo Studio | 7.8 | RecognisedAPIDocumented | $5/mo | Yes | — | — | View |
| 6 | GraphQL Hive | 7.7 | RecognisedAPIDocumented | $20/mo | Yes | — | — | View |
| 7 | Microcks | 7.7 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 8 | Postman | 7.5 | RecognisedAPIDocumented | $9/mo | Yes | — | — | View |
| 9 | OpenAPI Studio | 7.4 | RecognisedAPIDocumented | $9/mo | Yes | — | Yes | View |
| 10 |  SwaggerHub | 7.3 | RecognisedAPIDocumented | $61.67/mo | — | — | — | View |
| 11 | MockServer | 7.2 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 12 |  Swagger Editor | 7.1 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 13 | TypeSpec | 7.1 | RecognisedAPIDocumented | Free | — | — | Yes | View |
| 14 | PactFlow | 7.0 | RecognisedAPIDocumented | $115.42/mo | Yes | — | — | View |
| 15 | Stoplight Elements | 6.5 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 16 |  WSO2 API Designer | 6.1 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 17 | Smithy | 5.9 | RecognisedAPIDocumented | — | — | — | Yes | View |
| 18 | AsyncAPI Studio | 5.6 | RecognisedAPIDocumented | — | — | — | — | View |
| 19 |  vacuum | 5.6 | RecognisedAPIDocumented | — | — | — | Yes | View |
| 20 | Pact | 5.5 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 21 | Stoplight Prism | 5.3 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 22 | Mockoon | 5.2 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 23 | Assertible | 5.0 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 24 |  Schemathesis | 4.9 | RecognisedAPIDocumented | Free | Yes | — | — | View |
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which api design tool is ranked first on Inferse?
Apidog is ranked #1 of 24 with a score of 9.0. WireMock is second and oasdiff third.
How many of these have a free plan?
20 of the 24 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Apidog has the lowest first paid tier we found: $2.25/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.