UX (User Experience) is how a digital product works: whether it is understandable, easy to use and solves what the person came to do. UI (User Interface) is how it looks: colors, typography, buttons, icons and animations. Good UX with poor UI feels unpolished; a beautiful UI with poor UX is frustrating. Together they decide whether an app gets used or uninstalled.
The difference between UX and UI, with an example
Think of an app for booking a medical appointment.
- UX answers: how many steps does it take to book? What information do I ask for, and in what order? What happens if there are no appointments available? How do I confirm the booking went through?
- UI answers: what does the calendar look like? What color is the confirm button? How big is the text so that an older person can read it?
If the UX is well resolved, booking an appointment takes less than a minute. If the UI supports it, it also feels trustworthy and pleasant.
| UX | UI | |
|---|---|---|
| Core question | Does it work and is it understandable? | Does it look good and is it consistent? |
| Deliverables | Research, flows, information architecture, wireframes, prototypes | Visual design, components, design system, motion |
| Measured by | Completed tasks, conversion, retention | Consistency, accessibility, brand perception |
What a UX/UI design process looks like
- Research: user interviews, data analysis and competitor review. The goal is to understand real needs, not assumptions.
- Information architecture and flows: how the content is organized and what path each person follows to reach their goal.
- Wireframes: low-fidelity sketches to discuss structure without being distracted by colors.
- Clickable prototype: a simulation of the app, usually in Figma, that can be used as if it were real.
- Usability testing: real users try the prototype and we spot where they get stuck.
- UI design and design system: the final visual layer and a library of reusable components so development stays consistent.
- Post-launch measurement: analytics and session recordings to keep improving.
Why invest in UX/UI before coding
- It is cheaper to fix in a prototype than in code. Changing a flow in Figma takes hours; changing it in a published app takes weeks.
- It improves conversion. Every unnecessary step in a form or a checkout loses users.
- It increases retention. People come back to apps they understand from the first use.
- It reduces support requests. If the product explains itself, there are fewer complaints.
- It makes the product accessible. Designing with WCAG guidelines includes people with visual, motor or cognitive disabilities, and improves the experience for everyone.
Signs your app or website needs a UX review
- Many users start a process and do not finish it.
- Store reviews say it is “confusing” or “complicated”.
- The support team always answers the same questions.
- The app works well technically but does not grow.
UX/UI and development on the same team
One of the most common problems is that one team does the design and another does the development, and what gets built ends up different from what was designed. At QKStudio designers and developers work together from day one, so every experience decision is technically feasible and what was designed is what reaches people. Our UX/UI design work was recognized with the Good Design Seal in 2025 and 2026.
Want to know where the users of your app or website get stuck? Request a UX audit.
Frequently asked questions
Are UX and UI done by the same person?
They can be, but in medium and large projects they are usually different profiles working together: one more focused on research and flows, the other on visual design.
What tools are used?
Figma is the standard for design and prototyping. For measurement, GA4 and behavior tools such as Microsoft Clarity.
How long does a UX/UI phase take?
For an app MVP, between 2 and 4 weeks. An audit of an existing product can be done in 1 or 2 weeks.
