UX design and UI design are different jobs
UX design decides how the product works: who the users are, what they need to get done, the order of steps and what happens when something goes wrong. UI design decides how it looks and feels: layout, typography, colour, components and motion. A beautiful interface on a confusing flow still fails, so both are done together.
| UX design | UI design | |
|---|---|---|
| Main output | Flows, structure, wireframes | High-fidelity screens, components |
| Answers | Can people complete the task? | Is it clear, consistent and on brand? |
| Tested with | Prototypes and real users | Design reviews on real devices |