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Instead of Mockzilla

Mockzilla alternatives

Mockzilla turns OpenAPI specifications or plain JSON files into hosted mock APIs for frontend work, integration tests, and demos. It can generate schema-based responses, validate requests, and inject latency or errors to check retry and fallback behavior. Its proxy can combine a real backend with mock routes, while its GitHub Action creates and updates a mock URL for each pull request. Request history can be replayed, and payment simulations cover declines, 3D Secure flows, lifecycle operations, and idempotency.

1. 1

   Microcks

   Free plan APIExtensionLinux+4

   Open-source API and microservice contract testing — Microcks adds AsyncAPI, gRPC/Protobuf, GraphQL, and SOAP support plus provider and consumer contract testing.

   7.5 Free plan Visit site
2. 2

   Beeceptor

   Free plan APILinuxMac+3

   No-code mocks across varied protocols — Beeceptor adds HTTP/2, mTLS, and no-code matching rules while supporting more protocols than Mockzilla's HTTP focus.

   7.7 Free plan · paid from $10/mo · 10-day trial Visit site
3. 3

   MockServer

   Free plan APILinuxMac+3

   Broad protocol and chaos testing — MockServer adds SOCKS, experimental HTTP/3, traffic imports, OAuth2/OIDC mocks, and broader chaos testing options.

   7.3 Free plan Visit site
4. 4 M

   Mockttp

   Free plan LinuxMacSelf-hosted+2

   JavaScript HTTP integration tests and proxies — Mockttp is a JavaScript library for intercepting and transforming HTTP traffic rather than a hosted OpenAPI-to-mock API service.

   7.2 Open source Visit site
5. 5

   WireMock

   Free plan APILinuxMac+3

   Team API simulations and governance — WireMock adds REST, GraphQL, gRPC, Kafka, and SOAP simulations, plus enterprise governance and remote AI integrations.

   6.9 Free plan Visit site
6. 6 M

   Mockfly

   Free plan APIExtensionLinux+2

   Hosted REST mocks with browser capture — Mockfly adds XML and file responses, Faker.js templates, AI-generated payloads, and a Chrome extension for capturing browser requests.

   7.4 Free plan · paid from €15/mo Visit site
7. 7 K

   Knockout API

   Free plan APIWeb

   Image and video processing APIs — Knockout API processes images and video, while Mockzilla creates mock APIs from specifications or JSON.

   7.2 Free plan · paid from $0.02 Visit site
8. 8 I

   Imposter

   Free plan LinuxMacSelf-hosted+1
   7.3 Open source Visit site
9. 9 J

   json-server

   Free plan APISelf-hosted
   7.3 Open source Visit site
10. 10

    Mockoon

    Free plan APILinuxMac+3
    7.3 Free plan · paid from $100/mo (annual) Visit site
11. 11 M

    Mocki

    Free plan APISelf-hostedWeb
    7.2 From $15/mo · 7-day trial Visit site
12. 12 M

    MockAPI

    Free plan APIWeb
    7.1 Free plan Visit site
13. 13

    WireMock

    Free plan APILinuxSelf-hosted+1
    6.9 Free plan Visit site
14. 14 M

    moqapi.dev

    Free plan APIWeb
    6.8 Free plan · paid from $29/mo Visit site
15. 15

    Stoplight Prism

    Free plan APISelf-hostedWeb
    6.8 Free plan Visit site
16. 16 M

    Mirage JS

    Free plan Web
    6.7 Open source Visit site
17. 17

    Mock Service Worker

    Free plan Self-hostedWeb
    6.7 Free plan Visit site
18. 18 M

    MockWebServer

    Free plan Android
    6.7 Open source Visit site
19. 19 O

    OpenAPI Mock

    Free plan LinuxSelf-hostedWindows
    6.6 Open source Visit site
20. 20

    Hoverfly

    Free trial APILinuxMac+3
    6.5 From $10/mo · 14-day trial Visit site
21. 21 O

    OpenAPI Server

    Free plan APISelf-hosted
    6.5 Open source Visit site
22. 22 P

    Pretender.js

    Free plan Web
    6.2 Open source Visit site
23. 23 P

    Parasoft Virtualize

    Free plan LinuxMacWeb+1
    6.1 Free plan Visit site
24. 24 A

    API-Mocked

    Paid Self-hosted
    5.4 Open source Visit site

The Free plan has no API access and keeps request history for two hours; paid plans start at $10 per month. Mockzilla's CLI can also run offline, and the service supports Linux, macOS, Windows, web, API, and self-hosted use. Before switching, weigh whether you need broader protocol or contract-testing support, a language library, or image and video processing instead. Also consider deployment needs, integrations, request behavior, and pricing. Mockzilla's terms prohibit uploading sensitive personal, financial, health, or credential data, so that limit matters when choosing where test data should go.

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