Alternatives

Products that do what Mockline does

Instant Mock APIs from OpenAPI Specs

1. 1
   MockAPI Dog▲122

   Instant mock REST & LLM APIs - free, no signup required

   Feb 2026 · mockapi.dog

2. 2OM
   OpenAPI mocks that don't suck – realistic test data, quick setup▲13

   Hi HN! I'm Ankit, the founder of Beeceptor, a request mocking and intercepting tool. This time, I built something new to address a pain I’ve personally felt (and heard from dozens of QA, frontend, and platform teams): making OpenAPI specs actually useful during development. API contracts just sit around as docs often. What if you could 'activate' them, instantly have a realistic, hosted mock server-with contract validation, smart test data, and early usage? So I made _Mockaroo for OpenAPI_, but with brains. It spins up a hosted mock server from your spec in one click. It: - Generates…

   2025 · beeceptor.com

3. 3
   Mockoon▲89

   Mock servers in seconds

   2017

4. 4
   Mock API Generator▲548

   Generate custom data & API to build apps in less than 30s

   2021

5. 5MO
   Mockit – Open-source app to create and configure HTTP mocked endpoints▲158

   2019 · mockit.netlify.com

6. 6OD
   OpenAPI DevTools – Chrome extension that generates an API spec▲811

   Effortlessly discover API behaviour with a Chrome extension that automatically generates OpenAPI specifications in real time for any app or website.

   2023 · github.com

7. 7
   ApiHome▲73

   Home of API testing

   2022

8. 8MM
   Mockoon – mock REST APIs in seconds▲68

   2017 · mockoon.com

9. 9
   Mocktail – Free, open-source mock API server with a built-in dashboard▲25

   Hi HN, I built the first version of Mocktail years ago. I recently came back to the project, and after a pretty substantial rebuild, v4 is now out. Mocktail is a free and open-source, self-hosted mock API server with a built-in dashboard and database, packaged as a single ~25 MB binary. You can run it locally or on your own infrastructure — no account or hosted service required. You can define endpoints and responses, generate realistic data per request, customize headers, status codes and latency, and inspect incoming requests in real time. With v4, I also added MCP support, so coding…

   23d ago · getmocktail.com

10. 10
    Mockable▲114

    For rapid API prototyping: create REST/SOAP mocks in 3 sec

    2015

11. 11
    Mockphine▲87

    Mock blocked APIs, passthrough ready routes, see live source

    Mar 2026 · mockphine.com

12. 12
    Mockadillo▲115

    Mock your entire API in minutes.

    2019

13. 13
    Stateful Mock API▲1

    OpenApi to Live backend in seconds - Preserving Api State

    Apr 2026 · statefulapi.in

14. 14WA
    Web App for generating mocked data from an OpenAPI specification▲19

    2020 · github.com

15. 15NW
    New way to test APIs with OpenAPI and Postman▲80

    2021 · github.com

16. 16MS
    Mocktastic – Simple, Offline mock REST APIs for your entire team▲43

    2018 · mocktastic.com

17. 17
    Mocklets▲82

    A HTTP-based API simulator to assist parallel development 🛠️

    2018

18. 18IA
    Instant API – Build type-safe web APIs with JavaScript▲102

    Hey there HN! I just wrapped up an all-day documentation spree for Instant API, a JavaScript framework for easily building web APIs that implements type safety at the HTTP interface. It uses a function-as-a-service approach combined with a slightly modified JSDoc spec to automatically enforce parameter and schema validation before HTTP requests make it through to your code. You just write comments above your endpoint functions and voila, enforced type safety contracts between your API endpoints and your developers. OpenAPI specifications are generated automatically as a byproduct of simply…

    2023 · github.com

19. 19
    Platapi▲108

    Convert OpenAPI docs to working dynamic mock endpoints

    2024

20. 20
    Routebase▲106

    Design, mock, test, and document APIs from one living spec. Full test runner built in: suites, scenarios, ten auth schemes, CLI in CI. No OpenAPI needed.

    Jul 2026 · routebase.dev

21. 21
    Octrafic▲130

    Test your APIs in plain English, straight from the terminal

    Mar 2026

22. 22
    Mock Maker▲93

    Effortless mock APIs for seamless testing & prototyping

    2024

23. 23
    MockAPI

    Lightweight Local API Mock Server One binary Full-featured.

    Mar 2026 · mockapi.work

24. 24
    JSONing Mock API▲6

    Free and open source fake API for testing and prototyping

    Nov 2025

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