What is it about?
NPB Statistics is FREE but there are more add-ons
App Store Description
This app lets you browse through NPB players' basic statistics, such as Hits, Home Runs, Batting Average, and Strikeouts.
You can also check out the advanced (sabermetrics) stats with the in-app purchase.
You can check it out both in English and Japanese; in fact this app has been developed to serve for non-Japanese baseball fans.
(However, right now the player name is only in Japanese; I try hard to translate all the players' name to English.)
* Some icons are from Icon8 (https://icons8.com). Thanks!