The Skelly app, developed by Proko LLC, is a poseable, anatomically correct skeleton reference tool for artists, available for USD 6.99. It has over 10,000 downloads and a rating of 4.1 stars. Key features include a simplified version called "Robo-Skelly," proportions based on Dr. Paul Richer's teachings, compatibility with the "Loomis Head" technique, complete poseability, a Pose Library, movable camera, adjustable light source, options for light or dark backgrounds, and a reset feature. The app aims to assist artists in studying human anatomy and enhancing their creative process without the need for live models.