# What is Score Killers in PinFlag? > Canonical: https://pinflag.io/answers/about-pinflag/what-is-score-killers-in-pinflag The Insights card that totals the shots that cost whole strokes: three-putts, two-chips, penalties and double bogeys, per round and across the season. It is the fastest way to see which mistake decides your score, because each of those costs a full stroke on its own. Topic: About PinFlag, https://pinflag.io/answers/about-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.