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UI/UX Auditor by Zunderdog

Free AI UI/UX Audit Tool

Generate a free UX/UI audit. Identify improvements to enhance conversions, usability and visual impact.

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Zunderdog's UI/UX Auditor is a free UI UX audit tool that reviews a live website the way a design lead would on a first pass: what a visitor sees, how the layout guides them and where the experience breaks down. Paste in a URL and the AI UX audit runs in under a minute — no signup, no credit card.

The audit checks visual design quality (colour, typography, spacing, imagery), layout and information architecture, navigation clarity, mobile responsiveness signals, call-to-action effectiveness, content readability and hierarchy, accessibility considerations and overall brand consistency — the same categories a paid UX audit would start from.

Results come back in a SWOT format — strengths, weaknesses, opportunities and threats — with an overall UX score out of 100 and the reasoning behind it, so you get more than a number: you get a starting checklist. It's built for founders sanity-checking a site before launch, marketers auditing a landing page before a campaign, and agencies who want a fast first read on a client's site.

An AI audit is a strong first pass, not a replacement for a human design review — it won't run usability tests or talk to your users. Think of it as the fastest way to find the obvious problems before you bring in Zunderdog's design team for the deeper work.

How It Works

1. Paste your website URL

Enter any live website — yours, a client’s, or a competitor’s.

2. The AI reviews it against UX design principles

A screenshot of the whole page is analysed for design quality, layout, navigation, accessibility and more.

3. Get your instant SWOT audit

See your UX score and a preview of the strengths, weaknesses, opportunities and threats found.

4. Unlock the full report

Enter your email to see every finding and the full justification behind your score, then talk to our design team about fixing what matters most.

How the UX Score Is Worked Out

The score out of 100 is one overall judgement by an AI model, Google's Gemini 2.5 Flash. It isn't added up from separate checks and no area has a fixed weight. This is what happens when you run an audit:

  1. Your browser asks Microlink, a screenshot service, for a screenshot of the whole page at desktop width (1,440 pixels).
  2. Our server checks that the address is a public website and uses the screenshot only if it shows the page itself, not an error page or a bot check.
  3. Gemini looks at the screenshot for ten things: visual design (colour, typography, spacing and imagery), layout and information architecture, navigation, signs of mobile responsiveness, calls to action, readability and content hierarchy, signs of loading speed, accessibility, brand consistency and the first impression the whole page makes.
  4. It has to answer in a fixed format: an overall assessment, lists of strengths, weaknesses, opportunities and threats, a score out of 100 and a justification of how it reached that score. An answer in any other shape is rejected and you're asked to try again.
  5. It runs at temperature 0, the model's least random setting. Even so, two audits of the same page can differ.
  6. You see the score, the overall assessment and the first point of each list straight away, with no account. The rest of each list and the justification unlock when you enter an email address.

What the audit doesn't see

  • Your mobile layout: the screenshot is taken at desktop width only.
  • Your code: the model sees a picture of the page. It judges accessibility by what's visible, such as contrast and text size, not by the alt text, heading tags or form labels in the code.
  • Speed: nothing is timed. Lighthouse and PageSpeed Insights measure that.
  • The rest of your site: only the address you enter is audited.

If no usable screenshot comes back, the model reads the first 5,000 characters of the page's HTML instead, looking at what code shows, such as headings, labels and alt text, meta tags, performance hints, mobile settings and forms. On many sites that is mostly setup code rather than the visible page. Treat those audits as rougher. If the page can't be loaded at all, you get an error instead of a score.

An AI audit is a first pass. For user research, usability testing and a redesign by our designers, see our UI/UX design services. Our guide to UX audits explains what a full audit covers.

Frequently Asked Questions

Yes. Running the audit and seeing your score, overall assessment and a preview of the findings is completely free — no credit card, no signup. Unlocking the full report with every finding just takes an email address.

It's a fast, structured first read against established UX principles — strong for catching obvious design, layout and accessibility issues quickly. It doesn't replace usability testing with real users or a human designer's deep-dive, which is what Zunderdog's design team does next.

The score out of 100 reflects how well the site follows UX best practice across design, layout, navigation, content and accessibility. It's a benchmark to track improvement against, not a pass/fail grade.

Yes — enter any public website URL, including competitors’, to see how it scores on the same criteria.

PageSpeed and Lighthouse measure technical performance metrics. The UI/UX Auditor evaluates design, usability and user experience — how the site looks, reads and guides a visitor, not how fast it loads.

Most audits complete in well under a minute, including capturing a screenshot of the live page.