Screen Zone Mapper

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.