Chromatic

Percy

Percy is a visual testing platform, now part of BrowserStack, that captures screenshots of a web application across browsers and screen sizes on every commit, then compares them against an approved baseline to flag unintended visual changes. It plugs into existing test frameworks like Playwright, Selenium, and Storybook so teams add visual coverage without rewriting their test suite. An AI-powered Visual Review Agent prioritizes which changes actually matter and summarizes them in plain language, aiming to cut review time and alert fatigue from minor, harmless pixel differences. Dynamic content filtering, root-cause analysis (DOM vs CSS vs layout), and a real device cloud round out the platform for teams scaling visual test coverage.

Cypress

Cypress is an open-source test automation framework for web applications, built specifically for JavaScript and running tests directly inside the browser alongside the application under test. This architecture gives developers real-time visibility into DOM state, network calls, and console output while a test runs, rather than driving the browser remotely as older tools like Selenium do.

Applitools

Applitools is a visual AI testing platform built around Applitools Eyes, which compares baseline screenshots against new builds to automatically catch visual and functional regressions across browsers and devices. Its Visual AI algorithms replicate human perception to ignore irrelevant noise, like dynamic ads or timestamps, while still flagging meaningful layout or content changes, and it plugs into existing frameworks like Selenium and Cypress.