Built solo, end to end: research in caregiver communities, product definition, content design under heavy emotional constraints, visual design, and code. Vanilla JS with no framework, mobile-first, installable as a PWA, WCAG AAA verified with automated audits. The whole thing runs on privacy: no accounts, no server-side storage. A finished plan lives in the browser and travels as an encoded link; analytics are cookieless and never see what anyone typed.