The recipe calorie calculator runs entirely in your browser. Ingredient lists you paste are never uploaded, logged, or sent to any server. Your most recent recipe, servings and cooking settings are stored only in your own browser's local storage so they are there when you return; clearing your browser data removes them.
The site is served as static files by Cloudflare Pages, which records standard aggregate request logs (such as country and page requested) for security and performance. No personal profiles are built and no tracking cookies are set by this site.
Some pages link to external sites (for example USDA FoodData Central). Their privacy practices are their own.