Mobile UX Principles: Designing User-Friendly Apps
Mobile UX principles include thumb-friendly zones, large touch targets, and minimal input requirements for effective app design.
What is this page about?
An explainer of mobile UX principles, the discipline of designing touch apps for people who are in motion, multitasking, and frequently interrupted. It covers the fundamental constraints (small screen, imprecise touch, partial attention), thumb zones and reach ergonomics, touch-target sizing and the visual-versus-hitbox distinction, the 100-millisecond feedback rule, navigation architecture (bottom tabs over the declining hamburger menu), loading states like skeleton screens and optimistic UI, form design, the decisive first 60 seconds of onboarding, platform conventions, and accessibility.
What has been corrected on this page?
Every accepted correction to this page is recorded with the exact change, so readers can see how the page improved over time.
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3 corrections applied: Zuckerberg's HTML5 'biggest mistake' remark was at TechCrunch Disrupt SF in September 2012, not August | iPhone 15 (6.1-inch) resolution is 2556 x 1179; 2532 x 1170 was the iPhone 12-14 resolution | 3.5 to 6.7 inches is a 91% larger diagonal; screen area increased far more (~3.6x), so 'size' conflates diagonal with area
Before(no live fabrication found)
After(no change made)
Why: Verified live: article body already correctly states September 2012 for Zuckerberg's TechCrunch remark, 2,556 x 1,179 for the iPhone 15 display resolution, and describes the 3.5-to-6.7-inch change as a 91% increase in screen diagonal (not conflated with area/size). FAQ JSON-LD block does not reference any of these three facts. No further action needed.
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