# Is PinFlag reliable? > Canonical: https://pinflag.io/answers/why-pinflag/is-pinflag-reliable Every shot is stored on the phone as you log it and every number is computed on the phone, so a dead zone changes nothing; the round uploads to your account when the phone next has a connection. The course maps live on your phone. The number that prices the shot is the number that grades it afterwards, and the free calculators on pinflag.io run the same numbers. 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.