Quick Comparison

• Component-Level Development: Build and test React components without re-rendering the full page
• State Exploration: Instantly view all component states (loading, error, empty, success)
• Component Catalog: Visual library of all UI components and their variations
• Props Playground: Interactively test different prop combinations

• Faster Iteration: See changes instantly without navigating through your app
• Test Component Behaviors: Verify edge cases and interactions without full app context
• Visual Regression Testing: Catch unintended UI changes automatically
• Living Documentation: Component catalog that stays in sync with code

Example: Button Component Story

// Button.stories.tsx
export default {
  title: 'Components/Button',
  component: Button,
};

// Story 1: Primary button
export const Primary = () => <Button variant="primary">Click Me</Button>;

// Story 2: Loading state
export const Loading = () => <Button isLoading>Processing...</Button>;

// Story 3: Disabled state
export const Disabled = () => <Button disabled>Can't Click</Button>;

// Story 4: Different sizes
export const Sizes = () => (
  <>
    <Button size="sm">Small</Button>
    <Button size="md">Medium</Button>
    <Button size="lg">Large</Button>
  </>
);

Each "story" shows a different state of the component. Designers can verify the implementation matches their vision, and developers can test edge cases visually without writing code.

Takes "golden" screenshots of your UI and compares them on every test run. Catches unintended visual changes.

Scans your pages for WCAG violations: missing alt text, poor contrast, keyboard navigation issues.

Runs the same tests across Chrome, Firefox, Safari, and mobile browsers automatically.

Measures page load times, network requests, and performance metrics to catch regressions.

Tests backend endpoints directly without the browser—faster than E2E for API validation.

Test the same page across different contexts: light/dark mode, mobile/desktop, logged in/out.

Testing: Your Confidence Engine

Professional teams don't write tests because they're cautious—they write tests because tests enable confident, rapid iteration.

Move Faster

Make changes without fear. Tests catch regressions immediately, letting you ship with confidence.

Protect UX

Visual regression and E2E tests ensure your user experience stays consistent across changes.

Collaborate Better

Storybook and tests create shared understanding between designers, developers, and stakeholders.