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Alternatives

Products that do what MockAPI does

Lightweight Local API Mock Server One binary Full-featured.

  1. 1

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

    2021

  2. 2

    Develop APIs fast + automatically detect endpoints

    2025

  3. 3OM

    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

  4. 4OD

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

    2023 · github.com

  5. 5

    Instant Mock APIs from OpenAPI Specs

    Mar 2026 · mockline.xyz

  6. 6
    Decoy99

    Local server mocks in macOS, all in a lightweight native app

    Mar 2026 · decoy-app.com

  7. 7WB

    Hi, this is Mish and Sebastian. We are working on Step CI - a fully automated API testing platform for developers. Step CI works programming-language independent and for different API paradigms (REST, GraphQL, XML). Our CLI and test runner are available on GitHub (https://github.com/stepci) under the MPLv2 license. Since our last launch, Step CI is now able to generate automated tests for your API based on your OpenAPI (Swagger) spec. This saves you a lot of time as you never have to write and maintain your tests again! We would like to invite you to try our tool and give us…

    2022 · stepci.com

  8. 8
    Mockoon89

    Mock servers in seconds

    2017

  9. 9

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

    Feb 2026

  10. 10AF
  11. 11AG

    Hey HN! We've developed OpenAPI AutoSpec, a tool for automatically generating OpenAPI specifications from localhost network traffic. It’s designed to simplify the creation of API documentation by just using your website or service, especially useful when you're pressed for time. Documenting endpoints one by one sucks. This project originated from us needing it at our past jobs when building 3rd-party integrations. It acts as a local server proxy that listens to your application’s HTTP traffic and automatically translates this into OpenAPI 3.0 specs, documenting endpoints, requests, and…

    2024 · github.com

  12. 12MO
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    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

  14. 14WA
  15. 15

    A HTTP-based API simulator to assist parallel development 🛠️

    2018

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    Free online tool to test APIs and autogenerate documentation

    2018

  17. 17
    Platapi108

    Convert OpenAPI docs to working dynamic mock endpoints

    2024

  18. 18RA

    2023 · openapistack.co

  19. 19

    Mock your entire API in minutes.

    2019

  20. 20

    The digital twin of your be instant mock server from API

    Feb 2026

  21. 21NW
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    ApiHome73

    Home of API testing

    2022

  23. 23IA

    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

  24. 24MS

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