# How does PinFlag logging compare with sensor systems like Arccos or club-tag trackers? > Canonical: https://pinflag.io/answers/shot-logging/how-does-pinflag-logging-compare-with-sensor-systems-like-arccos-or-club-tag PinFlag logs with nothing to buy, charge or clip on: two taps on the map per shot, with the club and lie confirmed in one sheet. Because you place the target before you swing, PinFlag can price the shot before you hit it, which is the number sensor systems can only show afterward. Every shot also carries where you aimed, so your dispersion is measured from real rounds, not just where balls ended up. Topic: Logging shots, https://pinflag.io/answers/shot-logging ## 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.