Skin Regimen is a structured regimen engine. You tell it what's on your shelf; it returns a conflict-free weekly schedule, a severity-ranked list of ingredient interactions, and a cited answer for what to add, cut, or swap. AI only at the edges — never the verdict.
Works with the products you already own — not a subscription box.
Every finding links to a reviewed source. Severity is the engine's call, not a vibe.
Same shelf, same profile, same week — always. Engine version stamped on every result.