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Awesome Visual Regression Testing – Massive Collection of Resources

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Curated list of awesome visual regression testing resources.

Regression testing is a type of software testing which verifies that software which was previously developed and tested still performs the same way after it was changed or interfaced with other software. The purpose of regression testing is to ensure that changes to the software have not introduced new faults.


This is intended to be an incomplete list of resources about visual regression testing. It is not tailored to a specific area or role (Developer/QA/UX-Designer). Note that this is for all areas of regression software testing after the code in question is written. For a awesome list on general software testing see e.g. awesome-testing.


General information

Browser automation

  • Selenium – Browser automation framework and ecosystem.
  • SlimerJS – Scriptable browser like PhantomJS, based on Firefox.
  • trifleJS – Headless automation for Internet Explorer.
  • CasperJS – Navigation scripting and testing utility for PhantomJS and SlimerJS.
  • – Node.js bindings implementation for the W3C WebDriver protocol.
  • Navalia – Browser Automation based on headless Chrome and GraphQL.
  • Chromeless – Chrome automation made simple. Runs locally or headless on AWS Lambda.
  • – An automation framework that runs in-browser.

Tools and frameworks

  • basset – Open source platform for generating and reviewing visual differences. Supports multiple browsers, integrations for github and slack.
  • AyeSpy – 44 image comparisons in 90 seconds.
  • Wraith – Easy to use ruby tool with docker support.
  • BackstopJS – Config-driven automated screenshot test framework.
  • Galen – Java framework based on Selenium.
  • Creevey – Cross-browser visual testing with magic. Feature-rich tool with UI Runner, Tests Hot Reloading, Docker and Storybook integration.
  • CSSCritic – Lightweight CSS regression testing.
  • Spectre – Provides image comparison capabilities and an admin interface for managing screenshots.
  • Shoov – UI regression and functional testing focused on Drupal 7 sites.
  • qd_screenshottests – CasperJS-based UI regression and functional testing focused on Drupal 8 sites.
  • Look-alike – Chrome Extension for taking and comparing screenshots.
  • Hardy – Selenium-driven, cucumber-powered CSS testing.
  • TestCafe – Automated browser testing for the modern web development stack.
  • Needle – Needle is a tool for testing visuals with Selenium and nose (Python).
  • gatling – Integrated visual RSpec matcher which makes real visual testing easy (Ruby).
  • grunt-photobox – Plugin to prevent your project of broken layout via screenshot photo sessions of your site.
  • vrtest – JavaScript library for running visual regression tests on your components cross browser via selenium.
  • Happo – Visual diffing in CI for user interfaces.
  • reg-cli – Visual regression test tool which output easy-to-read single file html report.
  • Nightmare – High-level browser automation library based on Electron.
  • Puppeteer – Headless Google Chrome Node API.
  • Playwright – Node library to automate Chromium, Firefox and WebKit with a single API.
  • reg-suit – Visual regression testing suite which compares images, stores snapshots, and notifies the difference to your GitHub repo.
  • Chimp – Develop acceptance tests & end-to-end tests with realtime feedback.
  • Differencify – A library for visual regression testing using Puppeteer.
  • ResembleJS – Analyse and compare images with Javascript and HTML5.
  • Muppeteer – Visual regression testing framework for Chrome using Mocha and Puppeteer.
  • ember-visual-test – Simple visual regression testing for Ember.
  • AET – Scalable testing tool providing visual regression testing, accessibility and performance validation, markup analysis and more.
  • Wendigo – Test-oriented browser automation library based on Puppeteer.
  • Loki – Visual regression testing for Storybook using Chrome in docker et al.
  • Zombie.js – Insanely fast, headless full-stack testing using Node.js.
  • CodeceptJS – Modern Era Acceptance Testing Framework for NodeJS.
  • FuncUnit – A functional test suite based on jQuery
  • Nightwatch – Automated testing and continuous integration framework based on Node.js and using the Webdriver protocol.
  • Protractor – E2E test framework for Angular apps.
  • jest-puppeteer-react – Visual regression testing with Jest and puppeteer for React components
  • test-crawler – Visual regression testing, by crawling a website and providing snapshot comparison reports.
  • wdio-visual-regression – Visual regression tool for
  • Selenide – Framework powered by Selenium WebDriver for writing easy-to-read and easy-to-maintain automated tests in Java.
  • Karma – A test runner by the AngularJS team, that fits all our needs.

Online services

  • BrowserStack – Free for Open Source. Supports Selenium Webdriver.
  • LambdaTest – Perform Automated and Live Interactive Cross Browser Testing on 2000+ Real Browsers and Operating Systems Online.
  • – For React, looks open source.
  • applitools – Cloud base visual tests.
  • – Continuous visual reviews for web apps.
  • – Cloud based automation testing platform for web and mobile UI.
  • browserling – LIVE interactive cross-browser testing.
  • Browser Shots – Screenshots only.
  • Ghost Inspector – See introduction video.
  • CrossBrowserTesting – Manual & exploratory testing on 1500+ real browsers and mobile devices.
  • Argos-CI – Automate visual regression testing.
  • Diffy – Cloud based visual regression tool. Uses puppeteer and proprietary comparison algorithm (detect layout shifts). Great scalability with AWS Lambda.
  • Chromatic – Visual testing and UI review for component libraries. Cloud-based. Video
  • – Flexible visual regression testing service.
  • Happo – Cloud-based screenshot testing service with support for multiple browsers.
  • Visual Knight – Cloud-based visual testing platform with realtime results for testing tools.
  • Axcept – Testing for the whole team. Up to 100 tests in parallel. Endpoint Mocking. Code Coverage.
  • Fluxguard – Screenshot pixel and DOM change comparisons and regressions.
  • Vidiff – Cloud-based visual regression testing across stages.
  • Reflect – Visual regression testing and test automation tool.
  • Visual Regression Tracker – Open Source selfhosted service for visual regression testing
  • Micoo – Open source service for all UI application visual regression solution

Blog posts

Slideshows, talks and videos


The following projects are no longer maintained actively but are still worth mentioning because of their user base.

  • PhantomJS – Scriptable Headless WebKit. No longer maintained since 2 June 2018.
  • PhantomCSS – Visual/CSS regression testing with PhantomJS or SlimerJS. No longer maintained since 22 Dec 2017.
  • PhantomFlow – Experimental approach to UI testing, based on Decision Trees.
  • DalekJS – Automated cross browser testing with JavaScript. No longer maintained since 4 Jun 2017.
  • dpxdt – End-to-end testing with Python.
  • Visual Review – A human-friendly tool for testing and reviewing visual regressions.
  • Huxley – Python framework based on Selenium Webdriver.
  • WebdriverCSS – WebdriverCSS sits on top of and hooks into Selenium.
  • Gemini – Feature rich framework with support for Selenium and CasperJS. Gemini is deprecated, use hermione instead.
  • OcularJS – uses PhantomJS.

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