Penedex is a free iOS and iPad OS app designed for pen enthusiasts to effortlessly organize and manage their pen and ink collections. The app allows users to create entries for pens, inks, and everyday carry items, keeping track of pen and ink combinations, key details, purchase dates, and more. Users can quantify ink characteristics, mark pens for cleaning, and maintain a wishlist of desired pens and inks. The free version offers unlimited pen and EDC entries but limits ink entries to 10, with the option to unlock unlimited ink entries and other features through a Pro subscription.

Inked entries can be easily cataloged in the Inked tab, while the Library section provides a comprehensive overview of pen and ink collections, including detailed information and color matching capabilities. The Wishlist feature enables users to track pens and inks they wish to try out, and the app also includes a section dedicated to international pen shows, offering details, to-do lists, and budget tracking per show.