The Lokator Bullpen is a powerful pitching training app designed to be used with the physical Lokator Pitching Target. It offers 20 different bullpen sessions, each consisting of 20 pitches. The bullpens are named based on their goals and ranked by difficulty. The app focuses on teaching and documenting pitch command, selection, and sequencing.

Each bullpen session in the app features different methods and strategies to get hitters out. These methods have been practiced and executed in games by Steve Stemle, the inventor of the Lokator Target and System, during his journey to the Major Leagues. They have also been used by Stemle when coaching and teaching young pitchers.