The 20 - RPG Companion is an Android app by Sir Yorgan, designed as an alternative to paper, pencil, and rubber. It is compatible with the world's most popular RPG systems, making it the perfect companion app for long role-playing sessions. The app contains several features such as a highly customizable character sheet with advanced formulas and modifiers, dynamic effects that apply to character abilities, and a spellbook with several casting styles. The app also allows users to create their own spells, track initiatives, and sync dice rolls with friends automatically. Additionally, users can manage their inventory, equipment, resources, and magical items with individual charges, as well as access dice, skills, notes, daily rest, and much more.