Logitech Crayon - Digital pen - wireless - gray. Logitech Crayon is a versatile, pixel-precise digital pencil for all iPads (2018 and later) that lets you unleash your creativity. Mark up PDFs, take handwritten notes, or doodle a masterpiece - Logitech Crayon works with apps that support Apple Pencil. And with hundreds of Apple Pencil supported apps available right now, you can start learning, collaborating, and creating on iPad instantly.