Best Smartlook: Product analytics & visual user insights alternatives

This tool allows you to make HTTP requests to any endpoint, and then shows you the response. It's a simple tool to test your API requests and other endpoints.

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Page speed monitoring tool to optimize and improve your website performance and Core Web Vitals.

Storybook is a frontend workshop for building UI components and pages in isolation. Thousands of teams use it for UI development, testing, and documentation. It's open source and free.

Simplify front-end testing with Cypress' open-source app. Explore our versatile testing frameworks for browser-based applications and components.

The new way to design, develop, and deliver software with confidence.

Chai is a BDD / TDD assertion library for [node](http://nodejs.org) and the browser that can be delightfully paired with any javascript testing framework.

No more accidentally spamming real people. Ensure emails are sent at the right time, look great and do this inside the software you're building

Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases. Hosted on GitHub.

Easy to integrate and reliable visual regression testing cloud. Sleep better at night while shipping features.

Clobbr is a developer tool that allows you to load & speed test your API endpoints to see how well they perform under load from multiple requests (clobber your APIs!), in sequence or parallel. Regardless if you're testing a REST, GraphQL or cloud function Clobbr has got you covered!

Cross-browser end-to-end testing for modern web apps