Trait Deck is an offline personality-test app for entertainment and self-awareness. The user answers 40 first-person statements on a 5-point scale (about six minutes). Their answers are scored on five plain-language axes of the app's own model — Curiosity, Structure, Energy, Warmth, Sensitivity — and the two highest axes select one of twelve archetype "cards" (e.g. The Cartographer, The Comet, The Anchor). Each card has a six-layer written reading: who you are, strength and blind spot, up close, at work, under pressure, and who you run well with. The app also computes a two-person compatibility score: both people take the same test on the SAME phone (pass-the-phone), and the score is a transparent weighted comparison of the two sets of axis scores, shown axis by axis. Everything is computed on-device with a deterministic formula; there is no server, no AI, no account and no login. Monetization is a Google Play subscription (weekly, monthly and yearly plans, each with a free trial) sold through Google Play Billing; the free tier gives the whole test, the archetype card, the first two of six reading layers, one comparison and a shareable PNG card. Pro unlocks the remaining four reading layers, all twelve cards in the deck, unlimited comparisons and result history. Permissions: none requested. The app does not use the camera, microphone, location, contacts, storage or advertising ID. It has no ads and no analytics. IMPORTANT POSITIONING FOR THE LEGAL TEXT: Trait Deck is explicitly entertainment. It is NOT a psychological test, NOT a clinical assessment, NOT a diagnosis and NOT advice — the pages must say this plainly and must not imply medical, psychological, employment, or fitness-for-purpose validity. It is not based on and not affiliated with MBTI, Myers-Briggs, 16Personalities, Enneagram, DISC or any other third-party personality framework; the trait model and all archetype names are the publisher's own.