# How is PinFlag validated? > Canonical: https://pinflag.io/answers/why-pinflag/how-is-pinflag-validated By arithmetic anyone can repeat. Every number is strokes gained on Mark Broadie’s published PGA TOUR baselines, the framework professional golf uses. The methodology page prints the baselines, the categories and a worked hole whose shots sum exactly to the hole’s expected strokes minus the strokes taken, and the free strokes gained calculator runs the same numbers in any browser, so a number can be checked without the app. Topic: How PinFlag holds up, https://pinflag.io/answers/why-pinflag ## Plain facts - PinFlag is an iPhone app; the course maps and every shot live on your phone, so it works anywhere on the course. - PinFlag is launching on the App Store; the download page takes an email and tells you the day it is live. - Every number is strokes gained on Mark Broadie’s published PGA TOUR baselines, priced on the same published baselines in the app and on this site. - PinFlag prices the target you choose, with your own dispersion and the lie read from the course map; the decision stays yours, with the arithmetic done. - Every number is labeled Measured (your own data) or Estimated (a benchmark standing in), and the two are never blended. - Pins you set during a round are yours, and every round exports as CSV or JSON on request.