Verify UI functionality in the browser

Simulate clicks, typing, and hovers right in your browser to ensure everything works perfectly. Debug faster with DOM-based assertions and the exact browser state behind each failure.

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Made by the Storybook team

Run tests in the browser

Functional tests run in the browser, the same environment you use to develop components. That makes reproductions straightforward.

Debug with browser devtools

Simplify debugging by doing it directly in browser devtools with full access to DOM, styling, and assets.

Integrates with Git and CI

Functional test status is reported in pull requests and CI so your team can act on failures quickly.

Cross browser & responsive

Expand test coverage to Chrome, Firefox, Safari, and Edge in one click. All browsers run in parallel so your test suite stays fast.

Tests run in parallel by default

Your tests run on as many machines as needed, so results come back fast. Parallelization is automatic with no extra configuration.

Battle-tested in open source

Getting started with functional testing is easy because it uses industry-standard APIs. Testing-Library simulates user events. Jest and Vitest assert DOM structures.

“Chromatic helps us to prevent at least three critical UI bugs per week that would otherwise make our platform unusable.”

Orr Gottlieb

Engineering manager

How does functional testing work?

Components do more than just render the UI—they also fetch data and manage state. Functional tests let you verify functionality that your users encounter by simulating user events like click, type, and hover in the browser.

Powered by your Storybook

Stories capture all states and variations of components. They’re a structured way to keep track of UI test cases. Chromatic uses these stories to power functional tests. Best of all, it just works with no configuration.

Example of an functional test with multiple steps

Simulate user events with Testing Library

Assert DOM structure with Vitest/Jest

Render UI in Storybook

See test results at a glance

Chromatic runs all your tests in parallel in the cloud, giving you a clean dashboard to spot errors fast. Push code, check results, and get back to building.

Image of Chromatic dashboard with failed tests

See what needs attention

Get a shortlist of important visual changes and interaction test failures that require human attention.

Verify tests with your team

Bring design, product, and engineering into the review when a failed test needs a second opinion.

Share links to debug

Send teammates a link to a specific instance of a component to ensure they’re referencing the same test you are.

“Chromatic has reduced the number of UI regressions we ship by two-thirds.”

Paul Vidal

CTO

Debug easily in your browser

Reproduce and fix test failures directly in your browser—no test environment required. Debug with real code and devtools, then share a repro link with teammates in seconds.