Abstract: An external cover for a tablet smartphone with a flat touchscreen includes a rear clamshell formed of deformable plastic material that receives and surrounds the tablet, and a rim that resiliently clips the rear clamshell to the tablet. A hinge blister and intervening web forms a two degree of freedom hinge with a form-fitting front clamshell that can be freely lifted and dropped on the touchscreen but indexes to it, can be locked in place with a clip that readily engages and disengages from a docking port at the bottom of the tablet, and that is strengthened by an arch shaped rim. A planar sheet, formed of dielectric plastic, that covers the entirety of the flat touchscreen, is slightly suspended above to create an air gap, and is formed in a shape and thickness that substantially transmits the shape of a capacitive finger contact patch through the planar sheet to the touchscreen when the sheet is pushed down to the touchscreen.