# Do I need to understand strokes gained to use PinFlag? > Canonical: https://pinflag.io/answers/beginners/do-i-need-to-understand-strokes-gained-to-use-pinflag You use one comparison: this target against that one, before you hit. The strokes gained under the aim is the price of playing there, and moving the aim shows the price of playing somewhere else. The handicap level lens puts the numbers on your own scale, and the deeper Insights wait until you want them. Topic: PinFlag for beginners and high handicappers, https://pinflag.io/answers/beginners ## 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.