Built a free side-by-side California ADU cost ledger (800 vs 400 sq ft)

I needed a way to compare California ADU scopes without collapsing everything into one average cost per square foot, so I shipped a free side-by-side ledger at https://everylineitem.com/compare/. It walks a six-phase line-item ledger, and the page server-renders a default of a detached 800 sq ft build next to a 400 sq ft one so the cost cliff is visible immediately. Figures come from public sources (HCD, local permit context, NAHB framing) — no paywalled RSMeans. If you are weighing two ADU sizes before you hire anyone, the compare view is open.