UX audit – what it is, what it costs and what it finds that is slowing your website down

A UX audit is a structured review of how easy or difficult it is for human visitors to use your website. In the audit, an agency or consultant goes through flows, navigation, content and technology to identify friction points that make visitors hesitate or leave.

The audit results in a prioritised list of what should be fixed and, where relevant, proposed experiments to A/B test.

A website's user experience is not just about layout and flows. A page that loads slowly or jumps around while loading is as much a UX problem as an unclear button – but many UX audits stop at the visual layer. We recommend combining the classic heuristic review with measurable performance (such as Core Web Vitals). Where relevant, it can be worth reviewing technical SEO in the same audit.

What is a UX audit?

A UX audit (sometimes called a UX review or UX analysis) is a methodical review of a website or app that identifies where users run into friction and why. The result is a report with concrete, prioritised recommendations – not a complete overhaul of the design.

A UX audit answers three questions: Where are we losing visitors? Why is it happening? And what should we do about it, in what order? A good audit combines expert judgement (heuristic evaluation against established principles) with actual data on how visitors behave on the website.

What sets it apart from simply "having a look at the website" is the method. A heuristic evaluation checks the interface against a defined checklist – for example Nielsen Norman Group's ten heuristics – so that the assessment is consistent and can be followed up.

What is included in a UX review?

A complete UX review covers both how the website is experienced and how it performs technically. Here is what should be included:

• Heuristic evaluation – the interface is reviewed against established UX principles.
• Navigation and information architecture – does the visitor find what they are looking for, or is there a risk they get lost? If you have several audiences, put yourself in each one's shoes and consider how they expect to navigate – it should be clear to all of them.
• Conversion flows – forms, checkout, booking and every CTA on the way to the goal.
• Content and readability – is the text understandable, easy to read and matched to the visitor's search intent?
• Responsive design – does the experience work as well on mobile as on desktop?
• Accessibility – does the website meet WCAG, so that it works for all users?
• Technical performance – Core Web Vitals: loading time (LCP), responsiveness to interaction (INP) and visual stability (CLS).
• Data analysis – where in the flow do visitors drop off according to web analytics and heatmaps?

Technical performance is easy to overlook, but it is directly measurable user experience. A page with poor INP feels sluggish when you click; a page with high CLS makes buttons jump away just as you are about to tap. This is not abstract: according to web.dev, visitors are 24% less likely to abandon a page while it loads if it passes all three Core Web Vitals thresholds. A good INP value is under 200 ms.

What does a UX audit cost?

The price of a UX audit depends almost entirely on the scope, which is why list prices are hard to give. The cost comes down to how big the website is, how many flows, audiences and templates are reviewed, and how deep the analysis goes.

The biggest cost drivers are:

• Scope – a landing page is something completely different from an e-commerce website with hundreds of templates.
• Depth – a purely heuristic expert review is cheaper than an audit with user testing, analytics data and technical measurement.
• Method – a pure desk review costs less than moderated tests with real users.
• Deliverable – a short prioritised list does not involve the same work as a full report with wireframes.
• Technical component – if Core Web Vitals and code-level problems are included, developer expertise is needed, not just a UX designer.

Be honest with yourself about what you are buying. An audit in the lower price range is often a quick heuristic review – valuable, but superficial. If you want an audit that points to root causes, you pay for the time it takes to dig into data, technology and flows. Ask exactly what is delivered for the price.

UX audit vs CRO analysis – what is the difference?

A UX audit finds the friction. A CRO analysis proves which solution actually raises conversion. They are sequential steps – not synonyms – and are constantly confused.

A UX audit is qualitative and diagnostic: it identifies problems and proposes hypotheses about what should change. A CRO analysis (conversion rate optimisation) is quantitative and evidence-based: it prioritises the hypotheses and tests them, often through A/B testing, so that you know what actually changes the numbers.

The order matters. If you jump straight to CRO without an audit, you are testing blind. If you stop at the audit without CRO, you know where the problems are but not which actions pay off most. Together they form a chain: audit → hypotheses → test → proven effect.

If you want to dig deeper into how conversion rate optimisation is priced and what return it delivers, we have written a separate guide: CRO agency: what does conversion rate optimisation cost and what do you get for the money?

How do you know if your website needs a UX audit?

You need a UX audit when the traffic is there but the results are not – that is the clearest symptom. People find their way in, but something along the way stops them from doing what you want.

Common warning signs:

• High bounce rate – visitors leave quickly without exploring the website further.
• Many abandoned forms or checkout flows – people start but do not finish.
• Traffic without conversion – the visits are there, but enquiries and purchases are not.
• Complaints that things are hard to find – a sign of broken navigation.
• The website feels slow – this almost always shows up in Core Web Vitals.
• Big differences between mobile and desktop – often a responsive design problem.
• Ahead of a redesign – an audit makes sure you rebuild the right things.

Rule of thumb: if you plan to spend money on more traffic but do not know whether the website converts the traffic you already have, do the audit first. Otherwise you pay for traffic that will not convert anyway. How much could you gain from better conversion? Work it out quickly with our simple calculator.

How a UX audit works – step by step

A UX audit follows a logical chain from business goal to action plan:

• 1. Goals and context – which business goals should the website drive, and who are the users?
• 2. Data collection – web analytics, heatmaps and behavioural data are reviewed to see where visitors drop off.
• 3. Heuristic review – the interface is assessed systematically against established UX principles.
• 4. Technical measurement – Core Web Vitals and performance are measured on real pages, not just the homepage.
• 5. Accessibility – the website is checked against WCAG.
• 6. Prioritisation – the findings are ranked by impact and effort.
• 7. Report and walkthrough – a deliverable you can act on, plus a verbal walkthrough.

The most important step is the last one. A report that ends up in a drawer is money wasted – the value only appears when the recommendations are implemented. So always ask an agency how it supports the implementation, not just how thick the report will be.

AI readability as part of a modern UX audit

In 2026, "the user" is not always a human. More and more visitors find you through AI answers in ChatGPT, Perplexity and Google AI Overviews – which makes the question of whether an AI can read and understand your website part of the user experience.

This is AEO (Answer Engine Optimization), and it belongs in a modern UX audit. An audit should check whether the content is structured so that an AI can cite it correctly: clear, self-contained answers (semantic chunking), a logical heading structure and correct structured data. This is owned AEO – making sure the information about you on your own website is complete and machine-readable.

The point is not just visibility. If an AI lacks information about what you offer, it tends to answer "no" rather than "I don't know" when someone asks about you – and then you lose the deal before the visitor even reaches the website.

How to choose an agency for your UX audit

Choose an agency based on what you will actually have in your hands afterwards – and whether it can help you implement it. An audit is only worth something if it leads to action.

Questions to ask before you sign:

• Can I see an example of a previous deliverable? It will tell you more than the sales pitch.
• Is technical performance (Core Web Vitals) included, or only flows and heuristics?
• Are the findings prioritised by impact? A list of 80 problems with no ranking is hard to act on when time is limited.
• Do you help with the implementation?
• Do you also review AI readability/AEO?

Be sceptical of anyone who promises exact results in advance. A serious agency manages expectations: an audit finds the problems and prioritises them, but the effect is only proven when the actions are tested.

Want to know whether your website has friction that is costing you potential customers? Get in touch and we will look at it together.