Frosthaven Companion is a game companion application developed by Lucky Duck Games for Windows. It is a tool designed to streamline the setup process and maintenance while playing Frosthaven. This adventure game has a lot of complexities, but with Frosthaven Companion, players can easily manage their campaigns and parties.

One of the key features of Frosthaven Companion is its ability to create multiple parties for the players to maintain the state of multiple campaigns at once. It allows for multiple devices to synchronize at the same time, enabling remote play. The application automatically sets up all the monster stats, monster ability decks, and loot decks for the chosen scenario. Additionally, players can mark each scenario as started or completed, and track their progress. The app also supports opening sections in a scenario, which automatically instantiates the monsters (normal and elite) in that section.