What is UI/UX website design: what is the difference and how does it affect conversion?

When discussing turnkey website development, you may encounter two common concepts: UI and UX. It is a mistake to consider them synonymous because, in practice, they are responsible for different aspects of user interaction with a web resource. UI/UX design affects not only the visual component and appearance of a website but also how easily users can find the necessary information, place an order or submit a request.

Search engines evaluate websites not only based on technical parameters but also on the quality of the content provided. Behavioural factors, usability and user experience are considered essential ranking elements. Therefore, properly designed UI/UX simultaneously helps increase conversion rates and strengthen a website's position in search results.

What is website UI and UX design?

UI is responsible for the appearance of the interface, while UX design is responsible for the convenience of user interaction with the website. Together, they shape the user's overall impression of the website and directly influence the completion of target actions. Good design combines an attractive visual component with well-planned usage logic.

After understanding what UI and UX are and recognising their close connection, it is important to remember that they solve different tasks.

UI (User Interface) is the user interface that includes all visual elements of a web resource:

typography;
placement of information blocks;
colour palette;
buttons;
contact forms;
animation;
various images;
icons.

UI determines how modern, attractive and neat each website looks.

UX (User Experience) is the user's experience. This term refers to the complete set of impressions users receive during their first and subsequent interactions with a resource.

The main UX tasks include:

how quickly a visitor understands the website structure;
how quickly a user can find the necessary information;
how quickly a user can complete the required action without unnecessary effort.

Using a car as an analogy, UI is the car's interior, while UX is the convenience of driving it. An attractive interior cannot compensate for an inconvenient instrument panel or poorly positioned pedals.

What is the difference between UI and UX?

Website UI and UX design differ in their areas of responsibility. UI is responsible for the visual component of the interface, while UX is responsible for convenience, logic and user interaction scenarios. Both areas must work together because neither can function effectively without the other.

If users cannot quickly find a catalogue of products or services, place an online order or contact a company manager, even the most impressive design will not provide the desired business result. Conversely, a functional resource with an outdated design inspires less trust among users and reduces their desire to continue interacting with the website.

A practical comparison of the two areas:

UI includes appearance, colours and fonts, buttons and controls, visual appeal and aesthetics.
UX includes user experience, website structure, navigation logic, ease of completing actions and usability.

Therefore, professional web design involves working on UI and UX together to complete a wide range of important tasks.

Why does UI/UX affect website conversion?

Users need only a few seconds to decide whether to stay on a website or leave it. If a resource offers a clear interface and requires minimal effort to complete a target action, the probability of conversion increases several times.

Some online business owners mistakenly believe that conversion depends exclusively on the price of a product or the quality of the services provided. In reality, the entire process of user interaction with the resource has a significant impact on conversion.

For example, a visitor is highly likely to leave a website immediately when facing the following common problems:

The visitor constantly gets lost in the menu due to the large number of blocks and the absence of a logical structure.
The visitor is forced to complete an overly complicated form with many required fields.
The visitor cannot find the necessary section for a long time.
The visitor cannot see the order button on any page, including the home page and internal pages.

If a website offers well-planned UX design, users can gradually reach the required action without encountering any obstacles.

According to research by Nielsen Norman Group, an increasing number of modern users focus on a clear website structure. They choose websites with predictable interface behaviour and minimal cognitive load. As a result, the following rule applies in practice: the less users have to think about how to use a website correctly, the more likely they are to remain on the required page.

What principles form the basis of good UX design?

Creating effective UX is quite straightforward. It requires a clear structure, a consistent sequence of actions and a minimal number of obstacles in the user's path. Today, many modern approaches are based on proven research and usability principles.

One of the best-known guidelines is Jakob Nielsen's 10 usability heuristics developed by Nielsen Norman Group. These principles have been actively used in the design of various interfaces for a long time.

The most important principles include:

error prevention;
a clear system status so that users always understand what is happening;
concise design without unnecessary elements;
minimal demands on the user's memory;
correspondence between the interface and the real world;
consistency of all controls;
complete freedom of action and the ability to quickly undo a mistake.

Each of these principles has one important purpose: to make user interaction with the website as natural as possible.

For example, the order button should look the same on all pages, including the home page and internal pages. This way, users will not have to search for it visually every time and waste their valuable time.

What is Hick's Law and why is it important?

According to Hick's Law, the more choices a person is given, the more time they need to make the right decision. By applying this principle to web design, it is possible to create an interface that is simple yet effective.

When considering Hick's Law in practice, it becomes clear that too many buttons, menu items and links can reduce conversion rates.

When users immediately see several banners, numerous links and colour accents, as well as five or more calls to action on the home page, it becomes more difficult for them to determine what to do next. For this reason, experienced designers try to highlight one primary action at each stage of the user journey to avoid confusing potential customers. This approach reduces cognitive load and speeds up decision-making.

Which UI/UX mistakes most often reduce conversion?

An increasing number of website problems are related not only to technical issues but also to inconvenient user interaction with the interface. One or several minor shortcomings can negatively affect the number of potential customers and lead to their loss.

The following common mistakes occur most frequently:

advertising pop-ups that constantly appear and cover the main content;
an inconsistent style across different pages;
very slow page loading speed;
small fonts or poorly readable text;
an overloaded home page;
a complicated menu structure;
several competing calls to action;
long and inconvenient contact forms;
the absence of useful visual accents.

Each of the problems listed above increases the number of actions users must complete. Therefore, when developing an interface, the website should be viewed through the eyes of a visitor rather than an online business owner. To learn more about the features of a sales-oriented website, read the article UX of an online cosmetics store: what affects sales.

Why is UI/UX design an investment in online business development?

A well-planned interface allows users to achieve their goals much faster, while an online business can receive more enquiries, submitted requests and sales. Therefore, UI/UX design is considered a key tool for improving the effectiveness of a modern business.

Today, every website must simultaneously complete the following tasks:

attract the attention of potential customers;
build trust;
demonstrate the company's advantages;
guide users towards a target action.

If problems occur with even one of these tasks, the business may lose some of its potential customers.

For this reason, the design development of every resource begins with studying the audience, planning different user scenarios and creating a clear structure rather than selecting a colour palette or fonts. After that, the visual concept can be developed to create an interface that is both convenient and recognisable. This approach makes it possible to create a web resource that not only meets modern requirements but also helps the business achieve its goals.