Storybook + Figma Design Validation

Pixel-perfect isn't
a feeling.
It's a score 0

AI-powered design validation inside Storybook. Compare your components against Figma and get a compliance score — not a pixel diff.

How it works
🎨Colors & tokensCatches hex mismatches, opacity diffs, and wrong design tokens.
📐Spacing & dimensionsFlags padding, margin, and sizing discrepancies down to the pixel.
🔤Typography & weightsDetects wrong font sizes, weights, line heights, and font families.
localhost:6006
Button / Primary / Large
Button
ControlsActionsUI ReviewAccessibility
Click Review to compare against Figma
Visual Regression

“Something changed.”

UI Copilot

“This doesn't match the design.”

The Gap

Design handoff is broken

A designer gets spacing, colors, and typography right in Figma. A developer implements it and eyeballs the result. Two sprints later, the designer opens staging — the button color is wrong, the padding is off, and the font weight doesn't match.

Visual regression tools catch when your UI changes between builds — and that's valuable. But they don't answer a different question: does your code match the design in the first place?

UI Copilot answers that question — by comparing against the Figma file, the actual source of truth.

Features

Everything you need for design validation

Compliance Score

Every review produces a 0–100 score. Critical issues hit hard, minor ones barely register. Dismiss false positives — they stay dismissed.

Exact Values

Every issue shows expected vs actual: "Figma: #2563EB, Your code: #3B82F6." No guessing — exact hex codes, pixel values, font weights.

AI Comparison

Not pixel diffing. Semantic understanding of layout, colors, typography, and spacing. Catches issues that overlays miss.

Figma Mapping

Link stories to Figma frames once. Browse your Figma file in the addon panel. The mapping is saved for all future reviews.

How It Works

Validation right in your Storybook

Install the addon and validate components, pages, and any UI directly in Storybook—no context switching required.

1

Install the Addon

Add UI Copilot to your Storybook. Works with any story—components, pages, layouts, anything.

2

Link to Figma

In the addon panel, paste your Figma URL. One-time setup—the connection is saved for future validations.

3

Run Review

Click "Review" in the addon panel. AI compares your UI with Figma and shows issues with severity and compliance score.

From install to first review in under 5 minutes

FAQ

Frequently asked questions

UI Copilot uses AI to semantically compare your rendered Storybook component against the linked Figma frame. It checks colors, spacing, typography, dimensions, and layout—not pixel diffing.
No. UI Copilot is a standard Storybook addon. Install it, and it appears as a new panel tab. Your existing stories, controls, and configuration stay exactly the same.
Yes. Any story you can render in Storybook—components, pages, layouts, compositions—can be validated against a Figma frame.
It catches real mismatches in color values, font weights, spacing, and dimensions. You can dismiss false positives, and they stay dismissed for future reviews.
Re-run the review. UI Copilot always compares against the current state of your Figma file, so you'll immediately see if your code drifts from the updated designs.
Yes. UI Copilot runs inside your Storybook — no deployment or public URL needed. Review components while you develop, not after you deploy.
You can dismiss any issue that's intentional or not relevant. Dismissed issues are excluded from your compliance score and won't reappear in future reviews. The tool gets cleaner over time, not noisier.
UI Copilot processes screenshots and Figma metadata for comparison. Your source code is never uploaded. All data is encrypted in transit and at rest.

Your designs have specs. Your code should meet them.

Join the early access to get design fidelity checks inside Storybook — before your designer has to file the bug.

Free during early access · No credit card required