UI vs UX is a question about two different jobs. UX, or user experience, is how your website works for the person using it: whether they find what they came for and complete what they came to do. UI, or user interface, is what they see and touch while they do it.
A simple way to hold the two apart is a shop. UX is the layout of the aisles, the signs, the queue at the till and whether the thing you wanted is in stock. UI is the shelving, the lighting, the labels and the till screen itself.
Both shape the same visit. A site can look beautiful and still send people in circles, or work logically and look so dated that nobody trusts it.
If you own, run or commission a business website, this guide is for you. It explains what UX and UI each cover, who does what, how the two work together on a business website, and which one deserves your attention first.
UI vs UX: UX is how the whole visit works, and UI is how the screen looks and responds
Don Norman and Jakob Nielsen, who helped define the field, wrote that user experience encompasses all aspects of the end-user’s interaction with the company, its services and its products. That is a wide net. It covers the search that brought someone to you and the reply they get after they enquire.
UI sits inside that. The user interface is the part of the product a person can see and operate: the layout, type, colour, buttons, forms, menus and icons. It is how a screen presents itself and reacts when someone taps or clicks.
The cleanest way to separate them is to ask what question each one answers.
- UX asks whether the right person can reach the right outcome without confusion.
- UI asks whether each screen is clear, consistent and pleasant to operate.
Neither is optional. A good interface on a poor structure is a handsome dead end. A sound structure behind a muddled interface makes people work harder than they should.
Good UX meets user expectations and answers user needs. A visually appealing UI is the layer the end user interacts with. For digital products such as a B2B website or mobile apps, UI and UX design are one body of work seen from two sides.
UX designers decide who the site is for and how a visit should run
UX designers work mostly before anything is drawn. Their job is to understand people, then arrange the site so those people can get things done.
That begins with user research: talking to buyers, reading enquiry history, watching how visitors move through the current site and listing their pain points. From that come user personas, short descriptions of the main types of visitor and what each one needs to decide.
Next comes the structure. Information architecture is the way content is grouped and labelled so that people can predict where things are. We cover it in the Brand Library term on information architecture.
UX designers then map the user flow, the path a visitor takes from arrival to action. They sketch it as simple wireframes, test it with real people and revise. User testing is the step that separates a decision from an opinion.
What a UX designer hands over is rarely pretty. It is a set of choices: which pages exist, what order they sit in, what each page must prove and where the next step goes.
The UX design process is built around the target audience and the target users inside it. Good UX skills include asking the right questions, conducting user research and reading what people actually do instead of what they say they do.
Interaction design, the way the site responds to each tap or click, sits between the two disciplines.
UI designers turn that structure into a screen people can read and operate
UI designers take the structure and make it usable on a real screen. Their work is visual design plus the behaviour of the interface elements: buttons, forms, menus, cards, icons and the states each one shows when pressed, hovered or in error.
UI designers create layout design, graphic design and other visual elements that make an engaging UI. Good ux and ui design share one rule: the interface should stay out of the way.
Good user interface design makes the page easy to scan. Clear visual hierarchy shows what matters first. Consistent spacing and type tell the visitor that the company is careful. A short, plain error message tells them how to fix a mistake instead of just flagging it.
Responsive design is part of the job. The same page must work on a phone in Maun and on a desktop in London, which means layouts that rearrange rather than shrink.
Accessibility lives here too. The Web Content Accessibility Guidelines ask for a contrast ratio of at least 4.5:1 for normal text, and 3:1 for large text. Pale grey type on white can look refined and still fail a large share of readers.
Many UI designers also keep a design system: a shared library of UI components, patterns and rules, so that every new page looks like it belongs to the same company. That is where your brand identity meets the interface.
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UI and UX design are different work, and the best sites need both
The roles overlap. In small teams, one person, often a digital designer or a graphic designer who has learned the rest, covers both. Even so, the work divides cleanly.
| UX design | UI design | |
|---|---|---|
| Main question | Can people get what they came for? | Is each screen clear and easy to operate? |
| Starts with | User research and business goals | The agreed structure and the brand |
| Typical work | Personas, user journey, information architecture, wireframes, user testing | Visual design, type, colour, layout, interface elements, design system |
| Output | Site map, flows, tested prototype | Finished screens and components |
| Judged by | Tasks completed, enquiries made, drop-off points | Clarity, consistency, accessibility, polish |
| Risk if missing | Pretty pages that do not work | Sound pages that look untrustworthy |
In a typical design process the order matters. Research and structure come first, then wireframes, then visual design, then build and testing. Design thinking describes the same loop: understand the user, define the problem, make something, test it, and go round again.
The feedback loop between the two disciplines is what makes a site good. Testing shows that people miss a button, which is a finding about both flow and appearance. UX identifies the problem and UI often supplies the fix.
If you want to see how those pieces fit into a full website, our guide to B2B website design walks through the whole build, and what makes a good website lists the qualities to check.
Bad UX and weak UI look different on a business site
Knowing which one is failing tells you what to fix. Terrible UX makes people leave; good UX makes the next step obvious. The symptoms are not the same.
Weak UX shows up as behaviour. Visitors arrive and leave from the same page, or wander between pages without enquiring. They cannot tell what you do within a few seconds. The menu uses your internal names for services instead of the words buyers use. The contact route is buried, or asks for fifteen fields.
Weak UI shows up as friction on the screen. Text is hard to read on a phone. Buttons look alike, so no action stands out. Pages use three typefaces and five colours. A form gives no sign that it has been sent. Tap targets sit too close together.
Some problems straddle both. Speed is the clearest. Google’s Core Web Vitals set out what a good experience looks like: the largest element loads within 2.5 seconds, interaction responds within 200 milliseconds, and layout shifts stay at 0.1 or below.
Google measures these at the 75th percentile of page loads. Slow pages are a UX failure that no amount of polish repairs.
Our post on website design mistakes that quietly cost you enquiries goes through the most common ones and how to spot them on your own site.
Fix UX first on a business website, then give UI the polish it deserves
If you can only improve one thing, start with UX. A visual refresh cannot rescue a site whose structure sends buyers the wrong way. A clearer structure can lift a plain-looking site.
For a B2B company the first UX questions are practical:
- Who is the main visitor, and what do they need to decide?
- What is the one action each page should lead to?
- Is the proof they need (work, clients, credentials) on the page where they need it?
- Can they reach you in two clicks from any page?
Once those answers are clear, UI makes them credible. Consistent type, a restrained palette and readable layouts tell a buyer that you run a careful business. That is why a site’s interface should come from your brand, not from a template’s defaults.
The two are cheapest to fix together at the start. A redesign that changes the look but leaves the structure is where a business spends money and sees no change in enquiries. If you are weighing that choice, read whether to redesign your website first.
Brief your website around outcomes and both disciplines will follow
When you commission a site, you do not need to ask for “UX” and “UI” as separate items. Ask for what you want to be true once the site is live, and check that the people building it cover both.
Useful questions to put to any web design team:
- How will you learn who our visitors are before you design?
- How will you test the structure with real people?
- Who owns the visual system, and will it come from our brand identity?
- How will we know after launch whether more of the right people enquire?
Brandesis builds websites inside its website design service, where structure, content and interface are decided together. If you are still shaping your thinking, the Website That Sells ebook sets out how a site earns enquiries.
To keep learning in small steps, the Brand Library entry on user experience design is a quick reference, and the Ground Truth newsletter arrives every Wednesday with one practical idea about brands and the websites that carry them.
FAQ
What is the difference between UI and UX in simple terms?
UX is how well a website works for the person using it: finding things, understanding them and completing a task. UI is what that person sees and touches, such as layout, colour, type and buttons. UX is the experience of the whole visit. UI is the screen.
Is UX harder than UI?
Neither is harder in general; they need different strengths. UX leans on research, analysis and structured thinking. UI leans on visual craft, typography and detail. Small projects often use one person for both. Larger ones split the work so each specialist goes deeper.
What is the difference between UI, UX and CX?
CX, or customer experience, is wider than both. It covers every contact a customer has with your business: the website, the sales conversation, delivery, support and billing. UX is the part of CX that happens in a product or website. UI is the visible surface of that product.
Can AI replace UI and UX designers?
AI can speed up drafting layouts, variations and copy. It cannot replace knowing your buyers or deciding what your website must prove to them. That judgement comes from research and testing with real people, so the strategic UX work still needs a person who is accountable for the result.
Does a small business need both UX and UI design?
Yes, though not as two separate projects. Every website has a structure and an interface whether anyone designed them or not. The only choice is whether those decisions are made deliberately. A small site with a clear structure and a consistent look will usually outperform a larger one that was never planned.