The best Software Testing tools and resources on the internet.

Scan your entire site with Google Lighthouse in 2 minutes (on average).

Web vulnerability scanner written in Python3

Clean Code starts in your IDE

Layout and functional testing framework for websites.

Data Grid Table Editor and Data Generator

VS Code running fully in the browser.

pytest plugin for semantic LLM output testing — validate meaning, not just shape

Easy web performance trace sharing

Capture DOM elements with full context for AI debugging and analysis

Get a better understanding of your application performance and behavior with the debugbar.

Learn how to catch bugs and break software as you discover different testing methods that will help you build better software.

A collection of utilities for Playwright tests at SEON Technologies, designed to make testing more efficient and maintainable.

A web performance tool providing deep diagnostic information about how a page performs under a variety of conditions.

Inspect, debug, modify, and manipulate the state of Ethereum.

node:test runner wrapper with TypeScript support

An online JSON viewer that lets you minify, beautify, and load JSON from a file.

Capture your screen effortlessly with a free, browser-based recorder requiring no setup, installation, or signups.

CLI tool to run and test your HTTP requests. Git friendly, 100% local.

The free C/C++ and Fortran IDE.

🎨 Regex visualizer & editor

over 80–100 fully free, online tools for developers, designers, covering coding, design, graphics, text editing, image, network, cryptography and more..

Mock API by intercepting requests on the network level. Seamlessly reuse the same mock definition for testing, development, and debugging.

Automate web applications security assessments

Identify NPM libraries included in Javascript files

An online tool to enter a URL to see how well the images are optimized and what you can do to improve them.

A customizable Chrome and Firefox extension that fills dummy text in all input fields in a page.

A collection of useful links for Pentesters

The optimal flow for Jest based testing in VS Code

Avoid costly downtime. Minimize your risk of system failure by proactively testing for weaknesses before they become outages.

Supercharge your JMeter performance testing with AI-driven orchestration and analysis.