Chromatic

Chromatic is a visual testing and UI review platform created by the maintainers of Storybook, designed specifically for teams practicing component-driven development who want to catch visual regressions and streamline the UI review process for their component libraries and design systems. It is the most deeply integrated visual testing solution available for Storybook users. Chromatic captures snapshots of every Storybook story across multiple browsers, compares them against baselines, and surfaces visual changes for review. Because it is built by the same team that develops Storybook, the integration is seamless -- you connect your repository, and Chromatic automatically discovers and renders all your stories without additional configuration. The visual review workflow presents changes in a side-by-side comparison view where designers, developers, and product managers can approve or request changes. This creates a structured review process for UI changes that goes beyond code review to include the actual visual output. Beyond visual regression testing, Chromatic provides interaction testing capabilities that verify component behavior -- ensuring that hover states, click handlers, and other interactive elements work correctly. The platform also hosts and publishes your Storybook automatically, giving team members access to the latest version of your component library without needing to run it locally. This published Storybook serves as living documentation of your design system. Chromatic integrates with GitHub, GitLab, and Bitbucket, posting status checks on pull requests and linking directly to the visual review for each build. Chromatic is best suited for frontend teams that use Storybook for component development and want a purpose-built tool for visual testing and UI review. It is the natural choice for design system teams that need to ensure visual consistency across a library of reusable components. The tool offers a generous free tier for open-source projects and a free plan for small teams with limited snapshot usage. Paid plans scale based on the number of snapshots taken per month, which can add up quickly for large component libraries with many stories and multiple browser targets. Teams that do not use Storybook will not benefit from Chromatic, as it is purpose-built for that ecosystem.