Daycurve reads years of your Apple Health data and tells you what your own record can support — with the method beside it, and the caveat where one belongs.
It states what the record holds, and shows you how it knows. No rings that fill toward a goal nobody set. No green badges implying approval. No smoothing that implies a measurement that was never taken.
Some signals only mean something over a long run. Daycurve reads your whole record and is explicit about the difference between what it measured on you — with its interval — and what large studies found about people in general, which is never a statement about you.
Not as a promise, as a property: Daycurve has no networking code. There is no server, no account and no analytics. Its App Store privacy label reads Data Not Collected.
A record too short to support a measure gets told that, not a number. What could not be found is printed alongside what could.