Rosea started as an app I built for my wife — diagnosed with rosacea after a lifetime of facial redness, asked by her dermatologist to track daily triggers. An Excel sheet lasted a week. So I built something better. Log daily severity, symptoms, and triggers (weather, food, emotions, cosmetics, activity, medication). Get weekly pattern reports. Export a PDF or CSV for your dermatologist. Everything stays on your device. No account. No cloud. No subscription.