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Best OpenAPI Server Alternatives in 2026

Updated

20 tools from API mocking tools ranked against OpenAPI Server on the same published basis.

  1. 1
    Microcks Free plan apiextensionLinuxMacself-hosted Free7.6
    OpenAPI Server vs Microcks
  2. 2
    Mockzilla Free plan apiLinuxMacself-hostedWeb $10/mo7.6
    OpenAPI Server vs Mockzilla
  3. 3
    Parasoft SOAtest Free trial AndroidapiiOSLinuxMac 7.6
    OpenAPI Server vs Parasoft SOAtest
  4. 4
    WireMock Free plan apiLinuxMacself-hostedWeb Free7.6
    OpenAPI Server vs WireMock
  5. 5
    Mockttp Free plan LinuxMacself-hostedWebWin Free7.4
    OpenAPI Server vs Mockttp
  6. 6
    Mockoon Free trial apiLinuxMacself-hostedWeb €10/mo7.3
    OpenAPI Server vs Mockoon
  7. 7
    MockServer Free plan apiLinuxMacself-hostedWeb Free7.3
    OpenAPI Server vs MockServer
  8. 8
    WireMock Free plan apiLinuxself-hostedWeb Free7.3
    OpenAPI Server vs WireMock
  9. 9
    Mockfly Free plan apiextensionLinuxself-hostedWeb €15/mo7.2
    OpenAPI Server vs Mockfly
  10. 10
    Hoverfly Free trial apiLinuxMacself-hostedWeb $10/mo7.1
    OpenAPI Server vs Hoverfly
  11. 11
    Knockout API Free plan apiWeb $0.02/mo7.1
    OpenAPI Server vs Knockout API
  12. 12
    Imposter LinuxMacself-hostedWin 7.0
    OpenAPI Server vs Imposter
  13. 13
    moqapi.dev Free plan apiWeb $29/mo7.0
    OpenAPI Server vs moqapi.dev
  14. 14
    MockAPI Free plan apiWeb $2.92/mo6.9
    OpenAPI Server vs MockAPI
  15. 15
    Mocki Free trial apiself-hostedWeb $15/mo6.8
    OpenAPI Server vs Mocki
  16. 16
    OpenAPI Mock Linuxself-hostedWin 6.8
    OpenAPI Server vs OpenAPI Mock
  17. 17
    Stoplight Elements Free plan self-hostedWeb Free6.8
    OpenAPI Server vs Stoplight Elements
  18. 18
    MockWebServer Free plan Free6.6
    OpenAPI Server vs MockWebServer
  19. 19
    json-server Free plan apiself-hosted Free6.5
    OpenAPI Server vs json-server
  20. 20
    Mock Service Worker self-hostedWeb 6.5
    OpenAPI Server vs Mock Service Worker

OpenAPI Server alternatives compared

#ToolScoreFree planFromRuns on
1Microcks7.6Free planFreeAPI, Browser, Linux, Mac, self-hosted, Web, Windows
2Mockzilla7.6Free plan$10/moAPI, Linux, Mac, self-hosted, Web, Windows
3Parasoft SOAtest7.6No—Android, API, iOS, Linux, Mac, self-hosted, Windows
4WireMock7.6Free planFreeAPI, Linux, Mac, self-hosted, Web, Windows
5Mockttp7.4Free planFreeLinux, Mac, self-hosted, Web, Windows
6Mockoon7.3No€10/moAPI, Linux, Mac, self-hosted, Web, Windows
7MockServer7.3Free planFreeAPI, Linux, Mac, self-hosted, Web, Windows
8WireMock7.3Free planFreeAPI, Linux, self-hosted, Web
9Mockfly7.2Free plan€15/moAPI, Browser, Linux, self-hosted, Web
10Hoverfly7.1No$10/moAPI, Linux, Mac, self-hosted, Web, Windows
11Knockout API7.1Free plan$0.02/moAPI, Web
12Imposter7.0No—Linux, Mac, self-hosted, Windows
13moqapi.dev7.0Free plan$29/moAPI, Web
14MockAPI6.9Free plan$2.92/moAPI, Web
15Mocki6.8No$15/moAPI, self-hosted, Web
16OpenAPI Mock6.8No—Linux, self-hosted, Windows
17Stoplight Elements6.8Free planFreeself-hosted, Web
18MockWebServer6.6Free planFree—
19json-server6.5Free planFreeAPI, self-hosted
20Mock Service Worker6.5No—self-hosted, Web
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Questions about OpenAPI Server alternatives

What is the best alternative to OpenAPI Server?

Microcks, number 1 in API mocking tools with a score of 7.6 out of 10. The others here: Mockzilla, Parasoft SOAtest, WireMock and 16 more.

What is the best free alternative to OpenAPI Server?

Microcks is the best-ranked alternative with a free plan. 13 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing.