One-Handed Input

One-handed input refers to interaction techniques and interface designs that can be operated using a single hand, accommodating users who have limited use of one limb due to amputation, hemiplegia, stroke, cerebral palsy, or other physical conditions. One-handed input methods include specialized keyboards, adapted mouse devices, switch access, stylus input, and software optimized for single-hand operation. Interface designs that inherently support one-handed use — such as compact sequential key layouts or hierarchical menu navigation with a minimal key set — provide an important accessibility benefit by not requiring simultaneous bilateral coordination. WCAG 2.1 Success Criterion 2.5.1 (Pointer Gestures) addresses related concerns by requiring that multi-point gestures have single-pointer alternatives.