Browser-based testing for React components

Simulate clicks, typing, and hovers right in your browser to ensure that your React components work perfectly. Debug faster with DOM-based assertions and fix issues directly in your workflow.

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Made by the Storybook team

Run tests in the browser

Component 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

Component test status is reported in version control & CI to keep your team in the loop.

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 to deliver results in the least time possible. Parallelization is automatic with no extra configuration from you.

Battle-tested in open source

Getting started with component testing is easy because it uses industry-standard APIs. Testing-Library simulates user events. Jest asserts 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 component testing for React work?

Components do more than just render the UI—they also fetch data and manage state. Chromatic's component tests let you verify this functionality by rendering the component in isolation, simulating user events like click, type & hover in the browser, and running assertions.

Powered by your Storybook

Stories capture all states and variations of components. They’re a pragmatic, reproducible way to keep track of UI test cases. Chromatic uses these stories to power component tests for React. The best part is that it just works - no configuration necessary.

Example of an component test with multiple steps

Render UI in Storybook

Simulate user events with Testing Library

Assert DOM structure with Vitest/Jest

Your test results in one place

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

Online merge manager

Get an online dashboard of component test statuses and visual changes for every build.

Verify tests with your team

Collaborate on verifying changes with design, product, and engineering using the online merge manager.

Share links to debug

Send teammates a link to specific instance of a component to ensure they’re referencing the exact 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.