Dev tools · alternatives · 2026

24 alternatives to We built a tool that automatically generates API tests

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…

Step CI is an automated API testing platform that generates tests from OpenAPI specifications, eliminating manual test writing and maintenance. It supports multiple API paradigms including REST, GraphQL, and XML in a… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. We built a tool that automatically generates API tests launched in 2022; newer entries below may have overtaken it.

1. 1
   Automate API Testing and Quality Assurance with Step CI▲15

   The HN community has been very supportive of our recent launches, which is why we want to give you an update. Here is what changed with the latest release: - Addition of OAuth (Client Credentials flow) and Client Certificate auth - Reusable credentials - tRPC API support - Load Testing (HTTP and gRPC) - Splitting tests across multiple files - Various bug fixes, stability improvements and UX tweaks - Improved documentation and added FastAPI integration guide We built Step CI, because we wanted a simple, developer-friendly way to automate API testing without relying on proprietary cloud…

   2022 · github.com · its alternatives →

2. 2
   Auto-generate an OpenAPI spec by listening to localhost▲178

   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 · its alternatives →

3. 3
   Mock API Generator▲555

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

   2021 · retool.com · its alternatives →

4. 4
   Apidog Fast Request▲512

   Develop APIs fast + automatically detect endpoints

   2025 · fastrequest.apidog.com · its alternatives →

5. 5
   Cursor for your API▲473

   Generate, edit, lint & test your API workflow in one place

   2025 · app.getelva.ai · its alternatives →

6. 6
   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 · its alternatives →

7. 7
   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 →

8. 8
   Turn your OpenAPI spec into negative tests▲50

   I’ve been working on an open-source CLI tool called Dochia for a while now. The reason for building it: in microservices architectures, testing is repetitive: every service exposes APIs, and much of the testing process will share a similar set of test cases: negative inputs, boundary cases, encoding quirks, invisible characters. I wanted a tool that could automate this shared layer of testing instead of doing it manually across dozens of services. So what Dochia does: reads your OpenAPI spec; generates thousands of smart, edge-case payloads automatically and produces detailed reports with…

   2025 · github.com · its alternatives →

9. 9
   TestMagic▲53

   AI-powered API test automation. Save 90% of testing time

   2025 · irual.me · its alternatives →

10. 10
    CodiumAI▲332

    Generating meaningful tests for busy devs

    2023 · qodo.ai · its alternatives →

11. 11
    Swagger Inspector▲141

    Free online tool to test APIs and autogenerate documentation

    2018 · swagger.io · its alternatives →

12. 12
    Tango 2.0▲318

    Automatically generate step-by-step guides for your team

    2022 · tango.ai · its alternatives →

13. 13
    Akto's Test Editor▲143

    Your playground for writing custom API security tests

    2023 · akto.io · its alternatives →

14. 14
    create-api.dev by Kong▲150

    Generate and share OpenAPI specs with AI

    2025 · api.dev · its alternatives →

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

    Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽‍🚀 - apideck-libraries/portman

    2021 · github.com · its alternatives →

16. 16AG
    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 →

17. 17
    QAClan▲105

    AI-powered no-code QA automation platform

    2025 · qaclan.com · its alternatives →

18. 18
    Stage CLI – An easier way of reading your AI generated changes locally▲46

    Hey HN! We're Charles and Dean. A few weeks ago we posted about Stage, a code review tool that guides you through reading a PR step by step - https://news.ycombinator.com/item?id=47796818. We got a lot of great feedback but also heard from many people that they wanted to have the chapters experience even before opening a PR… so we built the Stage CLI as the local, open-source version that anyone can try. Here’s a quick demo video: https://www.tella.tv/video/stage-cli-demo-f55q It works with any coding agent of your choice. The skill instructs the agent to…

    May 2026 · github.com · its alternatives →

19. 19
    Refraction▲156

    Generate unit tests, create docs and refactor code using AI.

    2023 · refraction.dev · its alternatives →

20. 20
    Generate OpenAPI from Your Tests▲16

    OpenAPI linting, diffing and testing. Optic helps prevent breaking changes, publish accurate documentation and improve the design of your APIs. - optic/docs/generate-openapi.md at main · opticdev/optic

    2023 · github.com · its alternatives →

21. 21
    API Automation Testing Platform▲11

    All-in-One API automation testing platform

    2025 · its alternatives →

22. 22
    StepShot▲89

    AI that turns real workflows into step-by-step guides

    Aug 2026 · stepshot.app · its alternatives →

23. 23
    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 · its alternatives →

24. 24
    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 →

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 →