UI ParityBetaYour design system
is the contract.
UI Parity proves your code honors it.
Compliance score
AI-powered design system parity inside your existing Storybook. Compared against your Figma spec — not last week's build.
Your Stack
UI Parity is the layer your Storybook stack is missing.
Storybook catalogs your components. Visual regression protects against accidental changes. Design tokens keep your values in sync. All essential — none of them answer one question: does your code actually match the design?
UI Parity plugs into your existing stack and closes that gap. Same Storybook. Same CI. One more dimension of quality.
Storybook
Stories
Visual Regression
No regressions
Design Tokens
Values in sync
UI Parity
Design system parity
Colors & tokens
Catches hex mismatches, opacity diffs, and wrong design tokens.
Spacing & dimensions
Flags padding, margin, and sizing discrepancies down to the pixel.
Typography & weights
Detects wrong font sizes, weights, line heights, and font families.
Card / UserProfile / Default
Alex Smith
Product Designer
Design system lead working on component library.
No credit card required · Free during early access
The Gap
AI ships UI faster than review can catch it
AI agents now generate UI in seconds. Your design system took years to build. Without validation, the agent's speed becomes the system's entropy — drift creeps in every sprint, and the design system you invested in slowly stops being the one you ship.
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 system in the first place?
UI Parity answers that question — by comparing against the Figma file, the actual source of truth.
The question isn't whether someone on your team could catch drift manually. It's whether they're checking every story, every variant, on every PR.
Features
Everything you need for design system parity
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.
Runs where your team works
CI gates block merges that regress. MCP server exposes UI Parity to Claude, Cursor, and Copilot. Works with your existing Storybook setup — no migration required.
The Primitive
The hard part: knowing which story matches which frame
Design validation starts with mapping — which Storybook story corresponds to which Figma frame? UI Parity maps them automatically, saves the mapping, and uses it on every review. No guessing, no re-mapping, no broken references.
Card/UserProfile
Default · Hover · Loading
UserProfile/Card
3 variants · auto-linked
How It Works
Parity right in your Storybook
Install the addon and validate components, pages, and any UI directly in Storybook — no context switching required.
Install the Addon
Add UI Parity to your Storybook. Works with any story — components, pages, layouts, anything.
Link to Figma
In the addon panel, paste your Figma URL. One-time setup — the connection is saved for future validations.
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
Your designs have specs.
Your code should meet them.
Join the early access to get design system compliance checks inside Storybook — before your designer has to file the bug.
Free during early access · No credit card required