UX (user experience) design shapes how a product works for the person using it: research, user flows, structure and ease of completing tasks. UI (user interface) design shapes how each screen looks and responds: layout, color, typography, buttons and visual feedback. UX decides what the product should do and in what order; UI makes that experience visible, clear and attractive.
Key Takeaways
- UX design covers the whole interaction between a person and a product; UI design is the visual and interactive layer of that product.
- Cognitive scientist Don Norman joined Apple as a User Experience Architect in 1993, the first use of “User Experience” in a job title, according to his Wikipedia biography.
- UX work centers on research, flows, wireframes and usability testing; UI work centers on visual design, components, design systems and accessibility details such as color contrast.
- WCAG 2.2 sets a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text, a rule UI designers apply on every screen.
- The US Bureau of Labor Statistics groups both roles under web developers and digital designers, with a median pay of $99,520 as of May 2025.
Even if you are already aware of the definition of UX design and UI design, this guide explains what each discipline covers and how the two differ in practice. After all, expanding the abbreviation is not enough.
In this article, we have shared the difference between UI and UX to help clear your confusion and decide what your app needs more.
UX Design: What is it?
UX design stands for user experience design and cognitive scientist Don Norman popularized the term: according to his Wikipedia biography, he became the first person with “User Experience” in a job title when he joined Apple as a User Experience Architect in 1993. According to Norman, UX design defines a user’s experience with a brand and its products. Thus, irrespective of the medium, UX applies to any interaction between the customer and the services offered by the company.
However, user experience design is not only limited to the visual appeal of a product. From the ease of use to functionality and design, it takes into consideration each element that shapes the experience of an end-user with a brand.
In simple words, UX is the process of developing a product by carefully looking after all the elements involved and aiming for enhanced interaction between a user and a product.
UI Design: What does that mean?
The user interface, or UI, is a graphic layout of a certain product or service to enhance the user’s interaction with a company. While UX is more focused on the overall experience, UI design is more aimed towards the visual feel and attractiveness of a product. User interface designers therefore concentrate on the look, layout and interactive behavior of each screen of a product.
UI design hence encompasses the color palettes, animation, graphics, font style, buttons or widgets, etc. that appeal to the customer’s taste. For example, a shopping app for children’s products may use playful illustrations and bright colors, whereas a general marketplace app such as Amazon relies on a consistent color palette, standard buttons and a restrained layout.
Difference between UI and UX
Technically, UX and UI work hand in hand to make an app interesting, efficient, and purposeful. The UX team works on how the app works for the user: the user flows, the information architecture and how each task gets completed.
Contrarily, the UI team works on designing how each element will appear so that the user interactions are increased. User interface design therefore covers shapes, colors, typography, graphics, spacing and sizes.
Some of the key differences between UX and UI are.
- UX designers perform deep research to understand their target audience’s needs before designing the app. On the other hand, UI designers study visual patterns, typography and graphic elements that make the interface clear and encourage people to click and navigate the elements planned by the UX designer.
- UX designers keep themselves updated with the customer needs and work on aiming the market gaps by analyzing the competitors. On the other hand, UI design is a continuous evolution of placing each element on the app to make navigation more user friendly.
- UX aims for bringing a brand’s mission to life but UI helps in branding through a unique layout and theme.
- UX determines to create products that are positively perceived by the customers and UI handles how it instantly attracts them to interact.
- Most importantly, UX is concerned with how the app works and UI works on how the interface feels.
A high-functioning app cannot work without either of the two. As much as UX designers are needed to determine the roadmap of the app, UI designers bring all those plans to life. A strong idea that is poorly executed on screen rarely succeeds, and a polished interface cannot rescue a product that does not solve the user’s problem.
Similarly, the collaboration between UI and UX is required to make unique ideas look more interesting. Both of them are equally important and complement each other. Investing in both disciplines avoids two common failures: an attractive app that is hard to use, and a useful app that looks unfinished.
As an example, MailChimp is a useful example of UI and UX working together. MailChimp (now styled Mailchimp) is an email marketing platform founded in 2001 and owned by Intuit since November 2021, according to Wikipedia. Its guided campaign workflow is the UX layer: it decides which steps a user takes to build and send an email.
On the UI side, the brand’s mascot and illustrated graphics give the product a recognizable personality and an emotional connection that shapes its overall feel.
The Bottom Line
Both the UI and the UX design of your product play a significant role in the performance of your product or service. Understanding the responsibilities of each helps you hire the right people and plan the right work for your business.
Just like a building, UX is simply the architecture of your app whereas the UI design is how you design it to look more aesthetically appealing.
UX vs UI: Side-by-Side Comparison
The table below summarizes how UX design and UI design differ in focus, questions, methods and deliverables.
| Aspect | UX design | UI design |
|---|---|---|
| Core question | Does the product solve the user’s problem, and is it easy to use? | Is each screen clear, consistent and pleasant to interact with? |
| Scope | The whole journey, including steps that happen off screen | The visual and interactive layer of digital screens |
| Typical methods | User interviews, surveys, journey maps, information architecture, usability testing | Visual design, typography, color systems, iconography, motion, component libraries |
| Typical deliverables | Personas, user flows, sitemaps, wireframes, test reports | High-fidelity mockups, style guides, design systems, interactive prototypes |
| Measured by | Task success, time on task, error rates, user feedback | Visual consistency, readability, accessibility compliance, brand fit |
| Analogy | The architecture and floor plan of a building | The interior design and finishes |
What Does a UX Designer Do?
A UX designer researches who the users are, what they need and where an existing product lets them down, then plans the structure and flow of the product. The Nielsen Norman Group, co-founded by Don Norman and Jakob Nielsen, defines user experience as encompassing all aspects of the end user’s interaction with the company, its services and its products.
Many UX teams follow the Double Diamond, a design process model that the UK Design Council says it created in 2003. It has four phases:
- Discover – understand the problem through research with the people affected.
- Define – use the research insights to reframe the challenge.
- Develop – generate several possible solutions, often with users.
- Deliver – test solutions at small scale, reject what does not work and refine what does.
Wireframes are the usual bridge between UX and UI: low-detail page layouts that fix structure before visual design starts. This guide on why projects should start with a wireframe covers the benefits, and these steps to designing a strong user experience walk through the wider process.
How UX Designers Judge Usability
Jakob Nielsen’s 10 usability heuristics are a common checklist for reviewing an interface. According to the Nielsen Norman Group, Nielsen developed them with Rolf Molich in 1990 and refined them in 1994, and they have remained unchanged since then:
- Visibility of system status
- Match between the system and the real world
- User control and freedom
- Consistency and standards
- Error prevention
- Recognition rather than recall
- Flexibility and efficiency of use
- Aesthetic and minimalist design
- Help users recognize, diagnose, and recover from errors
- Help and documentation
Heuristic reviews are a quick expert check; they do not replace testing with real users. This article lists reasons to make usability testing a priority.
What Does a UI Designer Do?
A UI designer turns wireframes into finished screens: choosing the color palette and typography, designing buttons, forms, icons and states (hover, pressed, disabled, error), and documenting them in a design system so the product stays consistent. Interactive prototypes let teams click through the design before code is written; see these prototyping tools for web design.
Accessibility is part of the UI designer’s job. The W3C’s Web Content Accessibility Guidelines (WCAG) 2.2, in the version dated 12 December 2024, set these Level AA rules that apply directly to visual design:
- Text contrast (1.4.3): at least 4.5:1 for normal text and 3:1 for large-scale text.
- Non-text contrast (1.4.11): at least 3:1 for interface components and meaningful graphics against adjacent colors.
- Target size (2.5.8): clickable targets at least 24 by 24 CSS pixels, with some exceptions.
You can test a color pair against these ratios with the WCAG Contrast Checker: enter the text color and the background color, and the tool reports the ratio and whether it passes for normal and large text.
UX and UI Careers and Pay
In the United States, the Bureau of Labor Statistics (BLS) counts UX and UI roles within its web developers and digital designers occupation. The BLS describes digital designers as people who develop, create and test website or interface layout, functions and navigation for usability. According to the BLS, the median annual pay for the occupation was $99,520 in May 2025, the occupation held 220,100 jobs in 2025, and employment is projected to grow 5% from 2025 to 2035. Pay varies widely by location, employer and experience.
If you are weighing training options, this guide explains how to choose a UI/UX course.
Which Does Your App Need More: UX or UI?
Most products need both, but the order matters. Use these signals to decide where to invest first:
- Start with UX if users abandon tasks, contact support for basic actions, or you are not yet sure who the product is for.
- Start with UI if users complete tasks but the product looks inconsistent, text is hard to read, or the interface does not match your brand.
- Fix both together when launching a new product: research and wireframes first, then visual design, then usability testing on the finished screens.
Frequently Asked Questions
Is UX or UI more important?
Neither UX nor UI is more important on its own: UX determines whether a product is useful and easy to use, and UI determines whether it is clear and appealing on screen. A product with strong UX and weak UI feels unfinished, and a product with strong UI and weak UX looks good but frustrates users.
Who coined the term user experience?
Don Norman is credited with popularizing the term. According to his Wikipedia biography, he joined Apple in 1993 as a User Experience Architect, the first use of the phrase “User Experience” in a job title.
Can one person do both UX and UI design?
Yes. Many smaller companies hire UI/UX designers who handle research, wireframes and visual design. Larger teams usually split the work into specialist roles such as UX researcher, interaction designer and visual or UI designer.
Does a UX designer need to code?
Coding is not usually required for UX design, which centers on research, flows and testing. A basic understanding of HTML and CSS helps UX and UI designers communicate with developers and design screens that can actually be built.
What color contrast should UI designers use?
WCAG 2.2 Level AA requires a contrast ratio of at least 4.5:1 for normal text, 3:1 for large-scale text and 3:1 for interface components and meaningful graphics.
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