The Short Answer
Even experienced designers make these 10 mistakes. They’re subtle, they’re common, and they cost users time, frustration, and trust.
Here’s how to spot them and fix them.
1. Not Testing With Real Users
The mistake: Designing based on opinions, not evidence. “I think users will understand this.”
Why it happens: Testing feels time-consuming. Colleagues give “great, looks good” feedback that feels satisfying but is worthless.
The fix: Run usability tests with 5 real users. One session will change your perspective forever.
2. Ignoring Accessibility
The mistake: Designing for sighted, able-bodied users. Color contrast is too low. No keyboard navigation. Screen reader support is an afterthought.
Why it happens: Accessibility feels like extra work. “We’ll add it later.”
The fix: Build accessibility into your design system from day one. It’s not a feature — it’s a requirement.
3. Too Many Choices
The mistake: Showing users 20 options when 3 would do. Decision fatigue kills conversions.
Why it happens: Business stakeholders want to include everything. “What if someone needs X?”
The fix: Use progressive disclosure. Show what users need now. Reveal more as they progress.
4. Inconsistent Design
The mistake: Different buttons on different pages. Navigation that moves. Terminology that changes.
Why it happens: Multiple designers, no system, no documentation.
The fix: Build a design system. Components, tokens, guidelines. One source of truth.
5. Poor Error Messages
The mistake: “Error 404” or “Something went wrong.” No explanation, no solution, no way forward.
Why it happens: Developers write error messages, not designers.
The fix: Every error should say: (1) what went wrong, (2) why it happened, (3) how to fix it.
6. Hidden Navigation
The mistake: Navigation buried in hamburger menus. Users can’t find sections. They leave.
Why it happens: We want clean designs, so we hide things. But clean doesn’t mean hidden.
The fix: Show primary navigation. Hide secondary features. 3-5 items visible, always.
7. No Visual Hierarchy
The mistake: Everything competes for attention. No clear focal point. Users don’t know where to look.
Why it happens: Designers want to show everything equally important.
The fix: Size, color, and spacing create hierarchy. One primary element. Two secondary. Rest supporting.
8. Ignoring Loading States
The mistake: Blank screens while content loads. Users think the app crashed. They leave.
Why it happens: Loading states feel boring. “We’ll add them later.”
The fix: Skeleton screens, progress bars, or loading animations. Always show something while loading.
9. Complex Forms
The mistake: 15 fields on one form. No progress indicator. No save option. Users abandon.
Why it happens: “We need all this information.”
The fix: Break into steps. Show progress. Save automatically. Only require essential fields upfront.
10. Not Using Analytics
The mistake: Designing blind. No data on how users actually behave.
Why it happens: “Design is creative, not analytical.”
The fix: Track key metrics. See where users click, scroll, drop off. Let data inform design decisions.
The Bottom Line
Great UX isn’t about avoiding all mistakes — it’s about fixing them quickly. Test early. Test often. Listen to users. Iterate relentlessly.