How to Create a Mobile-First UX

Touch targets, thumb zones, navigation - the mobile-first design decisions that work on small screens first.

Mobile-first is not a technical constraint. It is a design philosophy. If a feature works on a 375px screen, it will work anywhere. If it only works on a desktop, you have a design problem - not a responsive CSS problem. This guide covers the specific design decisions that produce great mobile UX.

No fluff. Real craft from designers who ship products people love using.

The Thumb Zone and Why It Determines Everything

90% of smartphone usage is one-handed. The area reachable by the right thumb without adjusting grip is approximately the bottom two-thirds of the screen. This is not a nice-to-know detail - it determines where primary navigation, primary actions, and core content should live. Designing for the thumb zone means: primary navigation at the bottom (not the hamburger top-left), primary CTA at the bottom of the screen (not top-right), and destructive actions (delete, cancel) in the hard-to-reach zone as an intentional friction mechanism.

At Valletta Software, we focus on:

Thumb zone: primary actions in the bottom third of the screen - not the top bar

Navigation: bottom tab bar (iOS/Android standard) not hamburger menu - reduces taps by 50%

Touch targets: minimum 44x44pt on iOS 48x48dp on Android - larger than you think necessary

Content hierarchy: one primary action per screen - not six options competing for attention

Gestures: swipe to go back pull to refresh long press for secondary actions - follow platform conventions

Typography: minimum 16px body text on mobile - 14px is readable but causes zoom on iOS

Loading states: skeleton screens not spinners for content loads - perception of speed matters more than speed

The Mobile-First Design Process in Figma

Start at 375px. Scale up. Never the reverse.

We give you more than just people. We give you top performers who drive results.

Frame order: design 375px iPhone first then 390px then tablet then desktop - constraint produces clarity

Component sizing: all components designed for touch first - desktop can downsize more easily than mobile can upsize

Breakpoint logic: define what changes at each breakpoint - not just that it changes

Content prioritization: what is hidden on mobile and why - every hidden element is a design decision

Platform conventions: iOS and Android have different patterns - bottom sheet vs dialog - follow the platform

Prototype on device: send Figma prototype to phone for self-testing - desktop review misses mobile problems

Handoff: include both mobile and desktop frames in dev mode - annotated separately

You lead the work. We handle the rest. From EUR 45/h.

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How to Create a Mobile-First UX - With Designers Who Design for Thumbs First

Lets keep it simple.

Our designers use AI to move faster without cutting corners - Figma AI, Midjourney for moodboarding, automated accessibility checks, and AI-generated copy starters - so the creative energy goes into decisions, not busywork.

Lets keep it simple.

Our designers start every product at 375px - thumb zone, bottom navigation, minimum touch targets - before touching desktop

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