CertSolitaire is a free Android study app that turns CompTIA certification prep into an active-recall sorting game. Every miss unlocks a mnemonic so the concept sticks. Tracks: CompTIA A+ (Core 1 & 2), Network+ (N10-009), Security+ (SY0-701), and a mixed Triad mode. Features streaks, achievement badges, and a JSON Deck Studio for building custom decks. Free, fully offline, no account required, no ads, and no data collection.