AluPen Digital differs from its rivals in a few small ways. The most obvious is aesthetic: the design is classic Just Mobile—minimalist and clean—with a silver aluminum top half and a black plastic bottom; the other styluses use slippery, glossy-finished metal bodies. You twist the plastic to extend or retract a black tip; when powered on, you’ll see a pinpoint-sized green light on the base to indicate that the stylus is ready for…
