Visual Regression Testing

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Automating Visual Regression Tests

In this blog post we’re going to focus on the top end of the triangle, looking at ways to improve implementation and execution time as well as adding extra value to our tests.




(No longer supported) Huxley is a test-like system for catching visual regressions in Web applications


Java based tool for visual regression testing, supporting W3C and accessibility validators and even more.

Argus Eyes

A lightweight CLI tool for visual regression testing


BackstopJS is a config-driven automated screenshot test application for responsive websites and web-applications. Specify a set of DOM elements and viewport sizes and BackstopJS will work like an extra set of eyes on your workflow.


Website Visual Monitoring and Testing Platform


A visual regression testing tool that analyzes your html and css to explain why changes have occurred.


Chromatic is a screenshot testing & review tool for UI components and component libraries. It seamlessly integrates into your PR and CI workflow to notify you of UI regressions. Perfect for Storybook.


PhantomJS/SlimerJS-based tool which checks your current layout constantly against a reference image you have provided in the past. If your layout breaks (or simply changes - CSS Critic can't tell) your tests fail.

A simple API to quantify and visualize differences


Differencify is a library for visual regression testing by comparing your local changes with reference screenshots of your website. It is built on top of chrome headless using Puppeteer.


API/UI wrapper for PhantomJS screenshotting. Built in Python.


Screenshot and DOM change comparison using headless Chrome and Google puppeteer.

Galen Framework

A different spin on VRT, Galen tests the location of objects relatively to each other on page.


Selenium-based testing suite with API/UI functionality and full-featured tests.

Ghost Inspector

All in one tool that provides a visual editor (a free Chrome recorder extension) which allows you to record operations and assertions right in your web browser. Run the tests on a regular basis via their site.


A command-line tool that runs test assertions based on computed CSS of your site, comparing them to expected style definitions.


Built on top of PhantomCSS, adding new features like annotations for each screenshot and a viewer to compare and choose the correct screenshots.

Applitools Eyes

Cloud based software testing tool which integrates with many testing toolsets out there (including WebdriverIO/WebdriverCSS), providing additional functionality and an UI/API for managing test results.


A test-runner for image comparisons that is built on top of Blink-Diff


Ruby based tool to automatically test the design of your webapp.


A wrapper around Nightmare.js to look at your UI changes in prod before deploying to prod.


Faster, more user friendly visual regression testing.

Percy adds a visual review and approval service to your UI snapshots. It integrates directly into your GitHub pull requests, providing just in time visual regression testing.


A CasperJS module for automating visual regression testing with PhantomJS or SlimerJS and Resemble.js.


Node.js Visual regression test tool.


Command line tool built to find image-based differences between website updates. Based on Succss.


Hosted visual regression testing with powerful integration with Storybook (React/Vue/Angular etc).


Web-based visual regression testing tool that combines screenshot images with DOM and CSS verifications. Does not require coding. Based on visual comparisons.


UI/API interface for managing results of WebdriverIO/WebdriverCSS tests.


All-in-one tool promising quick set up with no test writing. Simply plug in your desired URLs and siteeffect will start watching for visual changes.


Command line tool built to find image-based differences between website updates. Succss relies on npm and is installed globally.


VisualReview's goal is to provide a productive and human-friendly workflow for testing and reviewing your web application's layout for any regressions. is a flexible visual regression testing service. Easy to use SDK/API. Use together with your preferred testing framework. Get results on email, in Slack or via webhooks.


This plugin is an automatic visual regression-testing tool for WebdriverIO. It was inspired by James Cryer's awesome project called PhantomCSS.


Automating visual regression testing

At it’s most basic, Visual regression testing is a series of tests that can run through your site, taking screenshots and comparing those screenshots against a baseline, alerting you when things change.

Visual Regression Testing - from a tool to a process

In this talk I will discuss how I converted PhantomCSS, a tool for visual regression testing, and integrated it into our workflow. I will also cover the challenges we faced which ranged from integrating the tests into our CI, test execution taking too long, ability to browse the test results and notifying developers about failed regressions.