iPhone Duo Ergonomic & One-Handed Reach Simulator

Form Factor & Hand Calibration

Form Factor Architecture

Contextual Daily Scenarios

Metro Standing Holding overhead rail with 1 hand; train lurch destabilization.

Coffee in Hand Carrying hot beverage; zero secondary hand assist possible.

Walking Transit Body bounce & stride pace reduces stable thumb pivot radius.

Bed Scrolling Gravity pulling device downward; pinky shelf hyperextension.

Pickups Per Day (Micro-Sessions) 120

Thumb Reach Span (Hand Size) 54th %ile (Medium)

Dominant Thumb Anchor Position

"Because it makes the most common thing we do with a phone mindless scrolling more annoying. You’re holding a coffee, carrying a bag, standing in the metro... that tiny inconvenience compounds massively."

Biomechanical Reach Heatmap & Thumb Arc

Natural Reach

Awkward Strain

Unreachable Zone

Drag thumb pivot circle or click device targets to test one-handed reachability

1-Handed Success 38% High drop risk

Reach Friction Index 8.4 Scale 1.0 (Flawless) - 10.0

Daily Awkward Stretches 1,008 Compounded micro-strain

Unreachable Screen Area 42.6% Upper & opposite corners

Zone / Action	Duo (84.2mm)	Standard (71.5mm)	Ergonomic Penalty