Dev tools · alternatives · 2026

24 alternatives to CATS

No-code Automated API Testing

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. CATS launched in 2021; newer entries below may have overtaken it.

1. 1
   Generate API tests for OpenAPI endpoints▲8

   CATS is a REST API Fuzzer and negative testing tool for OpenAPI endpoints. CATS automatically generates, runs and reports tests with minimum configuration and no coding effort. Tests are self-healing and do not require maintenance. - Endava/cats

   2020 · github.com · its alternatives →

2. 2
   I built an AI that turns GitHub codebases into easy tutorials▲923

   https://the-pocket.github.io/Tutorial-Codebase-Knowledge/

   2025 · github.com · its alternatives →

3. 3
   TestMace▲136

   Work with an API and create automated tests without coding

   2019 · testmace.com · its alternatives →

4. 4
   Anything API▲656

   Hey HN! We built Notte, a browser infrastructure and agents platform. Many of our users automate UI workflows or extract data from sites that don’t have APIs. In practice, we noticed that once an agent understands how a site works, parts of the task can often run without a browser by interacting with the same network requests the site uses. So we built Anything API: describe a browser task, and our agent explores the site, builds a function, tests it against your description, and deploys a callable REST endpoint. No infra to manage. How the build works: - Describe the task (best results come…

   Mar 2026 · anything.notte.cc · its alternatives →

5. 5
   bottest.ai▲155

   No-code automated chatbot testing

   2024 · bottest.ai · its alternatives →

6. 6
   Code Blocks by Sttabot AI▲131

   Build native applications in seconds

   2023 · its alternatives →

7. 7
   Refraction▲156

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

   2023 · refraction.dev · its alternatives →

8. 8
   We built a tool that automatically generates API tests▲108

   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 · its alternatives →

9. 9
   GoCodeo▲144

   AI-Powered Unit Testing

   2024 · gocodeo.com · its alternatives →

10. 10
    API Tester▲209

    The easiest way to test APIs

    2017 · its alternatives →

11. 11
    Expect▲109

    Let agents test your code in a real browser

    Mar 2026 · expect.dev · its alternatives →

12. 12
    HTTP Status Cats▲90

    A cat image for every HTTP status code

    2023 · httpcats.com · its alternatives →

13. 13
    Akto's Test Editor▲143

    Your playground for writing custom API security tests

    2023 · akto.io · its alternatives →

14. 14
    testRigor▲80

    Write your tests in plain English. No coding skills required

    2021 · testrigor.com · its alternatives →

15. 15
    Parrot QA▲114

    Automate your bug testing without writing a line of code.

    2016 · its alternatives →

16. 16
    Ponicode CLI▲140

    Achieve high code quality with AI unit test generation

    2021 · circleci.com · its alternatives →

17. 17
    Coding kitty▲91

    The cat that has a habit of singing while coding

    2021 · hostrider.com · its alternatives →

18. 18
    QAClan▲105

    AI-powered no-code QA automation platform

    2025 · qaclan.com · its alternatives →

19. 19
    Pythagora - automated integration tests▲141

    Save 30% of dev time - generate tests without writing code

    2023 · github.com · its alternatives →

20. 20
    MockThis▲80

    Generate mock data using AI

    2023 · its alternatives →

21. 21
    Testkit Public Beta▲110

    Create codeless tests that fix themselves with AI

    2022 · testkit.app · its alternatives →

22. 22
    We built an AI to review your pull requests▲53

    Hey HN, We’re two developers (co-founders) with a team of 20 who got tired of spending hours reviewing PRs, so we built Infinitcode.ai, an AI-powered code reviewer that: - *Summarizes PRs in plain English*: No more deciphering 1,000-line diff jungles - *Catches more than bugs*: Security holes, performance pitfalls, code smells, even typos (yes, we’ll flag “vurnerabilities” and vulnerabilities) - *Zero onboarding*: Works instantly—no “let me learn your codebase for weeks” nonsense. Why we’re posting: We’re in alpha and need brutal honesty. Roast our tool, mock our UI, or tell us why AI will…

    2025 · infinitcode.ai · its alternatives →

23. 23
    Kittens AI▲82

    Generate kitten images with AI

    2023 · kittensai.com · its alternatives →

24. 24
    Beta test Execute Program's interactive "Python for Programmers" course▲99

    I'm Gary Bernhardt, founder of Execute Program, an interactive platform for learning programming languages and other programming tools. Our "Python for Programmers" course is in a free open beta for the next week or so. We don't normally do open betas, but the infrastructure behind this course is new and very complex, so we want to stress test it. https://www.executeprogram.com/courses/python-for-programmer... Today, "Python for Programmers" contains 581 interactive code examples covering the core language. It's aimed at established programmers, not beginners. We don't…

    2023 · executeprogram.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 →