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Best OpenAPI Server Alternatives in 2026

Updated

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

  1. 1
    Microcks Free plan apiextensionLinuxMacself-hosted Free6.7
    OpenAPI Server vs Microcks
  2. 2
    Mockzilla Free plan apiLinuxMacself-hostedWeb $10/mo6.7
    OpenAPI Server vs Mockzilla
  3. 3
    MockServer Free plan apiLinuxMacself-hostedWeb Free6.6
    OpenAPI Server vs MockServer
  4. 4
    Mockttp Free plan LinuxMacself-hostedWebWin Free6.6
    OpenAPI Server vs Mockttp
  5. 5
    WireMock Free plan apiLinuxMacself-hostedWeb Free6.6
    OpenAPI Server vs WireMock
  6. 6
    Mockfly Free plan apiextensionLinuxself-hostedWeb €15/mo6.5
    OpenAPI Server vs Mockfly
  7. 7
    Knockout API Free plan apiWeb $0.02/mo6.4
    OpenAPI Server vs Knockout API
  8. 8
    MockAPI Free plan apiWeb $2.92/mo6.4
    OpenAPI Server vs MockAPI
  9. 9
    moqapi.dev Free plan apiWeb $29/mo6.4
    OpenAPI Server vs moqapi.dev
  10. 10
    WireMock Free plan apiLinuxself-hostedWeb Free6.4
    OpenAPI Server vs WireMock
  11. 11
    json-server Free plan apiself-hosted Free6.3
    OpenAPI Server vs json-server
  12. 12
    MockWebServer Free plan Free6.3
    OpenAPI Server vs MockWebServer
  13. 13
    Stoplight Elements Free plan self-hostedWeb Free6.3
    OpenAPI Server vs Stoplight Elements
  14. 14
    Parasoft SOAtest Free trial AndroidapiiOSLinuxMac 5.7
    OpenAPI Server vs Parasoft SOAtest
  15. 15
    Imposter LinuxMacself-hostedWin 5.6
    OpenAPI Server vs Imposter
  16. 16
    Mockoon Free trial apiLinuxMacself-hostedWeb €10/mo5.6
    OpenAPI Server vs Mockoon
  17. 17
    OpenAPI Mock Linuxself-hostedWin 5.5
    OpenAPI Server vs OpenAPI Mock
  18. 18
    Mock Service Worker self-hostedWeb 5.4
    OpenAPI Server vs Mock Service Worker
  19. 19
    Mocki Free trial apiself-hostedWeb $15/mo5.4
    OpenAPI Server vs Mocki
  20. 21
    API-Mocked 5.3
    OpenAPI Server vs API-Mocked

OpenAPI Server alternatives compared

#AppScoreFree planFromRuns on
1Microcks6.7Free planFreeAPI, Browser, Linux, Mac, self-hosted, Web, Windows
2Mockzilla6.7Free plan$10/moAPI, Linux, Mac, self-hosted, Web, Windows
3MockServer6.6Free planFreeAPI, Linux, Mac, self-hosted, Web, Windows
4Mockttp6.6Free planFreeLinux, Mac, self-hosted, Web, Windows
5WireMock6.6Free planFreeAPI, Linux, Mac, self-hosted, Web, Windows
6Mockfly6.5Free plan€15/moAPI, Browser, Linux, self-hosted, Web
7Knockout API6.4Free plan$0.02/moAPI, Web
8MockAPI6.4Free plan$2.92/moAPI, Web
9moqapi.dev6.4Free plan$29/moAPI, Web
10WireMock6.4Free planFreeAPI, Linux, self-hosted, Web
11json-server6.3Free planFreeAPI, self-hosted
12MockWebServer6.3Free planFree—
13Stoplight Elements6.3Free planFreeself-hosted, Web
14Parasoft SOAtest5.7No—Android, API, iOS, Linux, Mac, self-hosted, Windows
15Imposter5.6No—Linux, Mac, self-hosted, Windows
16Mockoon5.6No€10/moAPI, Linux, Mac, self-hosted, Web, Windows
17OpenAPI Mock5.5No—Linux, self-hosted, Windows
18Mock Service Worker5.4No—self-hosted, Web
19Mocki5.4No$15/moAPI, self-hosted, Web
21API-Mocked5.3No——
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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 6.7 out of 10. The others here: Mockzilla, MockServer, Mockttp 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 free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.