Dev tools · alternatives · 2026

24 alternatives to InterimAPI

Custom API endpoints with realistic fake data in seconds

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. InterimAPI launched in 2022; newer entries below may have overtaken it.

1. 1
   Mock API Generator▲555

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

   2021 · retool.com · its alternatives →

2. 2
   FakeData▲364

   Get your fake data in seconds

   2025 · fakedata-mu.vercel.app · its alternatives →

3. 3
   InstantDB▲320

   Complete backend with auth and storage in one prompt

   Apr 2026 · instantdb.com · its alternatives →

4. 4
   apiJuice▲223

   Create a hosted API for anything in seconds

   2025 · apijuice.com · its alternatives →

5. 5QG
   Quickly generate REST API (for Postgres db)▲70

   2019 · its alternatives →

6. 6
   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 · its alternatives →

7. 7
   Rapid - Real-time Database Service▲184

   Build real-time apps without maintaining the infrastructure

   2017 · its alternatives →

8. 8
   InstaAPI▲104

   Low-code API builder

   2023 · its alternatives →

9. 9
   MockAPI▲4

   Instant API Mocking for Faster Development

   2024 · its alternatives →

10. 10
    Fake API for Devs▲8

    Free mock api generator for developers | instant test data

    Nov 2025 · fakeapifordevs.vercel.app · its alternatives →

11. 11
    MockAPI Dog▲122

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

    Feb 2026 · mockapi.dog · its alternatives →

12. 12
    DummyAPI▲14

    Dummy API, rest API, AI Generated API Response

    2025 · dummyapi.uk · its alternatives →

13. 13
    A faster way to prototype your APIs using OpenAPI 3 and Swagger UI▲77

    A generator for OpenAPI 3. Contribute to egorsmkv/openapi3-generator development by creating an account on GitHub.

    2020 · github.com · its alternatives →

14. 14
    The all-in-one fake API▲12

    The All in one Fake API - Dummy data for your projects, fast and simple. Users, products, posts, comments and more

    2024 · fooapi.com · its alternatives →

15. 15
    Fake Data▲61

    A form filler extension with a lot of features

    2021 · fakedata.pro · its alternatives →

16. 16
    MockAPI▲5

    Accelerate Your Development with Realistic Mock APIs

    2024 · mockapi.com · its alternatives →

17. 17
    ApiHome▲73

    Home of API testing

    2022 · apihome.io · its alternatives →

18. 18
    Web App for generating mocked data from an OpenAPI specification▲19

    Progressive Web App for generating mocked data from an OpenAPI specification - Fredx87/openapi-mock-generator

    2020 · github.com · its alternatives →

19. 19
    MockREST – Create REST APIs from Your JSON Content▲12

    Mock REST endpoints in seconds. Test without backend delays. Built for developers who need reliable mock data now.

    2017 · mockrest.com · its alternatives →

20. 20
    TinyApi's▲14

    Speed up development with ready to use API's

    2024 · its alternatives →

21. 21
    Rest Faker▲13

    Generate complete REST APIs with CRUD in matter of seconds

    Jun 2026 · its alternatives →

22. 22
    Fauxy▲1

    Mock API endpoints instantly. No setup. Just a URL.

    Mar 2026 · fauxy.io · its alternatives →

23. 23
    fake REST API▲4

    REST API for developers to test and prototype applications.

    2019 · its alternatives →

24. 24AG
    Auto-generate load tests/synthetic test data from OpenAPI spec/HAR file▲33

    Hey HN, We just shipped a new AI-powered feature... BUT the "AI" piece is largely in the background. Instead of relying on a chatbot, we've integrated AI (with strict input & output guardrails) into a workflow to handle two specific tasks that would be difficult for traditional programming: 1. Identifying the most relevant base URL from HAR files, since it would be tedious to cover every edge case or scenario to omit analytics, tracking, and other network noise. 2. Generating synthetic data for API requests by passing the API context and faker-js functions to GPT-4. The steps are broken down…

    2024 · docs.multiple.dev · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →