Product Feature

Visual Comparison Tool for Design QA

Visual comparison overlays a design on the live page so you can see exactly where the build drifted from the spec. Compare a Figma frame or an uploaded image, spot the spacing, color and typography differences, and capture each one as a tracked issue with its real CSS values attached.

How Visual Comparison works

Visual Comparison renders your design spec as a semi-transparent layer on top of the live webpage in your browser. You can adjust opacity, toggle the comparison on and off, and pan across the page to spot differences between design and implementation. When you find a discrepancy, OverlayQA's capture and AI tools turn it into a structured, exportable issue.

When you spot a difference, click on the element to capture its exact CSS properties, DOM selector, and a screenshot of the discrepancy. OverlayQA's AI analyzes the visual differences, so instead of saying "the spacing looks wrong," you can report that a component has 16px padding when the spec calls for 24px. This precision eliminates ambiguity and lets developers fix issues in a single pass.

There are two ways to run a visual comparison, and one of them needs nothing installed. On any public URL, open the page in Team Review from the dashboard, upload your design, and OverlayQA captures the page and reports the differences. For localhost, staging, preview deployments, and login-gated pages, the Chrome extension runs the same comparison in your own browser session and adds the Figma frame browser, so you pick a frame instead of exporting a PNG.

Why visual comparison matters in website design and development

• Eliminates tab-switching: compare design specs and live implementations in the same view instead of toggling between tools.
• Pixel-precise reporting: click any element to capture exact CSS values and DOM selectors, giving development teams actionable context instead of vague feedback.
• Catches what manual review misses: subtle spacing, color, and typography differences that human eyes miss become visible when design and implementation are compared side by side.
• Protects the final product: visual comparison catches drift before it reaches production, ensuring the user experience matches the original design intent across every release.
• Share findings with anyone: generate a public link to share captured issues with stakeholders, clients, or teammates who don't use OverlayQA. No login required.

Frequently asked questions about visual comparison

What is visual comparison in OverlayQA?

Visual comparison overlays your design, a Figma frame or an uploaded image, on the live page in the browser. You adjust opacity to spot differences, drag a divider to sweep between design and build, and click any element to inspect its computed CSS values.

Do I need Figma to use visual comparison?

No. You can upload an image as the comparison source and overlay it on the live page. Connecting Figma through OAuth adds a frame browser and two-way comment sync, but it is optional.

How is visual comparison different from visual regression testing?

Visual regression tools diff screenshots of past builds against new builds, so they catch changes but not whether either build matched the design. Visual comparison checks the live page against the design source of truth during implementation, before a wrong baseline gets locked in.

What is scrub mode?

Scrub mode is a clip-reveal comparison: a vertical divider you drag across the page, showing the design on one side and the live build on the other. It makes spacing and alignment differences visible without toggling opacity back and forth.

Can I capture issues while comparing?

Yes. Click any element during a comparison to capture a screenshot, the CSS selector, and computed values like padding, font, and color. AI drafts a structured issue you can export to Jira, Linear, Notion, Asana, or Trello.

If I overlay the build on the Figma file, do they match 100%?

Almost never on the first pass, and that is the point of checking. Overlaying the design on the live page makes the gaps visible instead of debatable: OverlayQA reports which elements diverge and by how much, using the page's real computed CSS values rather than an eyeballed guess.

Is there an AI tool for UI review against a Figma design?

Yes. OverlayQA's AI Visual Comparison sends the design and a capture of the live page to GPT-4o, which lists the visual differences it finds and drafts each one as a structured issue with a severity. You review the findings and create the issues you want to keep.

Do I need to install anything to compare a design?

Not for a public URL. Open the page in Team Review from the OverlayQA dashboard, upload your design, and the comparison runs server-side with nothing installed. The Chrome extension is required for localhost, staging and login-gated pages, and for comparing against a Figma frame or a PDF.