Duel Deck is a free iPhone app developed by LK Lab SAS di Lagorio Fabrizio. It is a life point calculator specifically designed for card games like Yu-Gi-Oh! With a new graphical interface and an iPad version, Duel Deck offers a user-friendly experience for players.

The app features a simple and intuitive design, with all the necessary functions accessible on one page. It supports two players and even remembers their names, making it convenient for multiplayer matches. To use the app, players just need to enter the scores and tap the '+' or '-' buttons below the selected player. Scores are updated instantly, allowing players to continue with their next move seamlessly.

One of the standout features of Duel Deck is that it is completely free. Players can enjoy all the functionalities without any cost. The app is a reliable companion for card game enthusiasts, providing a quick and efficient way to track life points.

Please note that "Yu-Gi-Oh!" is a registered trademark of Kazuki Takahashi.