Dev tools · alternatives · 2026

24 alternatives to Assertible

The easiest way to test and monitor your APIs

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Assertible launched in 2016; newer entries below may have overtaken it.

1. 1
   API Tester▲209

   The easiest way to test APIs

   2017 · its alternatives →

2. 2
   Assertible – Test and monitor your production APIs▲6

   We're proud to announce Assertible, a tool for testing and monitoring production web services.

   2016 · assertible.com · its alternatives →

3. 3AS
   Assertly – scriptable monitoring for infosec, IT, compliance, DevOps▲53

   Hey HN! Jaka here, solo founder of Assertly (https://www.assertly.com). Assertly is a monitoring tool for continuous infosec, IT, compliance and DevOps regression testing. It enables teams to automate periodic checks using JavaScript. Before Assertly, I was the CTO of Celtra (https://celtra.com), a B2B SaaS company, for over 10 years, from “git init” to 250 people and the company’s sale to private equity. I was primarily responsible for product strategy, engineering, QA, DevOps, but also for IT and InfoSec. I found that ensuring security, integrity, privacy, and…

   2024 · assertly.com · its alternatives →

4. 4
   Blitz▲127

   Performance testing on websites, web apps & REST APIs

   2015 · blitz.io · its alternatives →

5. 5
   Simply Testable▲105

   Free one-click full-site frontend web testing

   2014 · its alternatives →

6. 6
   StopLight▲94

   The easiest way to test, debug, and share your web APIs

   2014 · stoplight.io · its alternatives →

7. 7
   Checkly 2.0▲209

   Monitor your modern web app in 1 minute. Free dev plan!

   2021 · checklyhq.com · its alternatives →

8. 8
   Probely 2.0▲93

   Quickly scan your website and fix vulnerabilities

   2019 · probely.com · its alternatives →

9. 9
   Every Developer▲138

   Evaluate an API before you code

   2016 · everydeveloper.com · its alternatives →

10. 10
    Detectify▲124

    Application security testing reimagined

    2014 · detectify.com · its alternatives →

11. 11
    APIUtility▲66

    Product manager tool for API testing and bulk transformation

    2023 · its alternatives →

12. 12
    StopLight▲137

    Mock, document, and test your way to API nirvana.

    2016 · stoplight.io · its alternatives →

13. 13
    Apptimize▲74

    The easiest way to make impactful mobile A/B tests

    2014 · airship.com · its alternatives →

14. 14
    ApiChecker▲104

    Reliable uptime and performance monitoring for your services

    2019 · its alternatives →

15. 15
    Proven by Users▲64

    Online UX testing & usability research tool suite

    2021 · provenbyusers.com · its alternatives →

16. 16
    veggies▲7

    The easiest way to test APIs

    2017 · github.com · its alternatives →

17. 17
    ApiHome▲73

    Home of API testing

    2022 · apihome.io · its alternatives →

18. 18
    ezyMock▲81

    Mocking API endpoints has never been easier

    2017 · its alternatives →

19. 19
    TestMunk▲93

    Mobile QA made easy

    2014 · its alternatives →

20. 20
    ABBY.io▲94

    The easiest way to evaluate A/B tests, all in a single place

    2015 · abby.io · its alternatives →

21. 21
    Mock Maker▲93

    Effortless mock APIs for seamless testing & prototyping

    2024 · its alternatives →

22. 22
    Webmate▲83

    Automatic cross-browser testing service for web developers.

    2015 · webmate.io · its alternatives →

23. 23
    Checkly▲10

    A better way to monitor your API's and site click flows.

    2017 · checklyhq.com · its alternatives →

24. 24
    An assertion library for E2E testing and real user monitoring▲8

    Faultsense JS agent — source-available browser instrumentation - Faultsense/faultsense-agent

    Jul 2026 · 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 →