Sideboardr

Sideboardr is a mobile + web app for competitive trading card game players who keep losing post-board games because their sideboarding is inconsistent, rushed, or poorly documented. You create matchup-specific sideboard plans (IN/OUT lists) for each deck you face, attach short reasoning notes, and track what you actually did during a match. After each round, the app prompts a 30-second debrief: what you played against, what you boarded, and whether it worked. Over time it surfaces patterns like “you overboard vs aggro” or “this plan underperforms on the draw.” It also supports quick offline mode for tournament halls with bad reception and exports clean printable sheets for events that restrict phone use at the table. This is not a deckbuilder replacement; it’s a focused performance tool for the most error-prone part of competitive play.