PitchSim

Sports

Free · In‑App Purchases

PitchSim lets you visualize baseball pitch trajectories through physics simulation — no throwing required. Adjust velocity, spin rate, spin axis, and gyro spin to see how any pitch moves in real time. From a 4-seam fastball to a knuckleball, explore 11 pitch types with scientifically grounded physics. [Who It's For] · Fans who want to understand why Ohtani's sweeper breaks the way it does · Pitchers and coaches who want to learn spin axis and gyro effects without a Rapsodo · Physics enthusiasts who want to experience the Magnus effect firsthand [Features] ■ 11 Pitch Presets 4-Seam Fastball, 2-Seam Fastball, Changeup, Curveball, Slider, Gyro Slider, Sweeper, Sinker, Splitter, Forkball, Knuckleball ■ 3D View (4 Angles) Catcher, Right-Hand Batter, Left-Hand Batter, and Orbit views. Freely rotate in Orbit mode to see the full 3D trajectory. ■ Parameter Control Adjust velocity, spin rate, spin axis, and gyro spin with sliders. Changes reflect instantly in the 3D view. ■ Freeze at Zone Pause the ball exactly as it reaches the front of the strike zone. Compare ABS (Automated Ball-Strike) and rulebook judgements side by side. ■ Pitch Comparison (up to 4) Overlay multiple pitches to compare trajectories visually. Great for understanding pitch sequencing and tunneling. ■ Stats Panel Displays horizontal break, vertical break (IVB), exit velocity, and hop component — all in Statcast-compatible units (cm / inches). ■ 2D Views Switch between pitcher's-eye and top-down views for horizontal break analysis. [Physics Model] Based on Alan Nathan's baseball physics model (University of Illinois). Implements Magnus force, aerodynamic drag, gyro spin effects, and seam drag. Calibrated against Statcast data. [Free vs. Full Access] Free: 3 pitches (Fastball, Curveball, Slider), Catcher view only PitchSim First (one-time purchase): All 11 pitches, 4 views, Freeze, Pitch Comparison, and Stats Design pitches. Understand the physics. No ball required.

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Added iPad support with a two-column landscape layout for simultaneous 3D view and parameter control.

Version 1.1

The developer, HIROSHI YASUNAGA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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    Information

    Seller
    • HIROSHI YASUNAGA
    Size
    • 4.8 MB
    Category
    • Sports
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 HIROSHI YASUNAGA
  • Privacy Policy

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