Dev tools · alternatives · 2026

24 alternatives to Assertible – Test and monitor your production APIs

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

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

1
Assertible▲50
The easiest way to test and monitor your APIs
2016 · assertible.com · its alternatives →
2AS
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 →
3
Checkly 2.0▲209
Monitor your modern web app in 1 minute. Free dev plan!
2021 · checklyhq.com · its alternatives →
4
Reactful▲312
Understand your visitors and optimize your site in real time
2016 · reactful.com · its alternatives →
5
Session Replays by Requestly▲518
Debug web apps faster with record & replay
2023 · requestly.com · its alternatives →
6
Time travel debugger for web development▲681
Automated Penetration Testing for AI-Built Apps
2021 · replay.io · its alternatives →
7
Replay QA▲438
Replay QA tells you what is broken before your users do
Jul 2026 · qa.replay.io · its alternatives →
8
Probely 2.0▲93
Quickly scan your website and fix vulnerabilities
2019 · probely.com · its alternatives →
9
Detectify▲124
Application security testing reimagined
2014 · detectify.com · its alternatives →
10
API Tester▲209
The easiest way to test APIs
2017 · its alternatives →
11TR
Testing RESTful services▲13
2018 · medium.com · its alternatives →
12
Proven by Users▲64
Online UX testing & usability research tool suite
2021 · provenbyusers.com · its alternatives →
13
F19n Obtrusive Livetest▲82
Frontend Performance Analysis Tool for Chrome
2018 · github.com · its alternatives →
14
Buildkite Test Analytics▲59
Observability for your test suites
2022 · buildkite.com · its alternatives →
15
Checkly▲10
A better way to monitor your API's and site click flows.
2017 · checklyhq.com · its alternatives →
16
Retest▲116
Cross device website testing made simple.
2019 · retest.app · its alternatives →
17
a tool for inspecting HTTP callbacks in realtime▲21
2013 · webhookinbox.com · its alternatives →
18
Testlemon▲20
Low-code API testing and website monitoring tool
2025 · testlemon.com · its alternatives →
19
equa11y▲108
A stream-lined CLI to easily test for web accessibility
2020 · equa11y.com · its alternatives →
20
Releasy▲89
Test management platform & Issue tracker for agile teams
2023 · releasyapp.io · its alternatives →
21
Probely▲87
Intuitive and easy-to-use webapp vulnerability scanner
2018 · probely.com · its alternatives →
22
Continuously testing Heroku GitHub deployments▲12
Running automated QA tests against your web service every time you deploy to Heroku is the best way to complete your continuous integration pipeline. Using Heroku Review Apps along with our GitHub deployment integration makes this trivial using Assertible.
2016 · assertible.com · its alternatives →
23
Webmate▲83
Automatic cross-browser testing service for web developers.
2015 · webmate.io · its alternatives →
24
PageProofer▲72
Give your team feedback on your site quickly
2020 · pageproofer.com · its alternatives →

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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 →