Screen Zone Mapper

NALEN SP LTD

About this app

Screen Zone Mapper helps you plan phone UI that feels natural in one hand.

Place buttons, icons, FABs, navigation, and other controls on a device canvas, then see how far the thumb has to travel. Color-coded Easy, Comfortable, Stretch, and Difficult zones show where interaction is effortless—and where it starts to strain.

What you can do
• Choose a phone size preset or enter custom dimensions
• Set holding hand, hand size, and grip height
• Drag elements on a live canvas with an instant reach score
• Preview the thumb arc, zone overlay, and full score breakdown
• Save, rename, duplicate, and favorite layouts
• Compare two layouts side by side with clear score deltas

Metrics at a glance
Overall reach score, hardest element, average reach distance, top-area load, opposite-corner penalty, and bottom-zone efficiency—so you can refine placement with purpose.

Built for designers, product teams, and anyone shaping mobile interfaces. Approximate planning guidance based on a simplified geometric model—not a medical or scientific measurement.

Open Screen Zone Mapper, map the reach, and ship layouts that feel better in the hand.