I designed an AI second brain companion that...

Every personal tool you use is a silo. MyFitnessPal knows what you eat. Fitbit knows your steps. YNAB knows your spending. Your journal app knows how you feel. Apple Health aggregates some health data. None of them talk to each other. I kept running into this: I'd notice a pattern in my life — spending more on stressful weeks, sleeping worse after certain kinds of conversations, feeling sharper on days I ate clean — but no tool could confirm it. The data existed across five different apps. The c