PitchSim

Sports

Free · In‑App Purchases · Designed for iPad

v2.1 — SSW (Seam-Shifted Wake) powered by physics. Realistic asymmetric aerodynamic forces from seam orientation. Fixed layout display on Mac. PitchSim visualizes baseball pitch trajectories through physics simulation. Without throwing a single ball, just adjust velocity, spin rate, spin axis, and gyro spin to see how 15 pitch types move in real time — from a 4-seam fastball to a knuckleball. [Who It's For] · Fans who want to understand why Darvish's slider 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 and Seam-Shifted Wake firsthand [Features] ■ 15 Pitch Presets 4-Seam Fastball, 2-Seam Fastball, Sinker, Changeup, Curveball, Slider, Gyro Slider, Cutter, Sweeper, Shoot, Splitter, Forkball, Knuckleball, SSW Demo ↘, SSW Demo ↖ ■ 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 8) 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. v2.0 adds SSW (Seam-Shifted Wake) — a physics-based model of the asymmetric wake caused by seam orientation, improving accuracy for sliders, cutters, sinkers, and other seam-sensitive pitches. Calibrated against Statcast data. [Free vs. Full Access] Free: 6 pitches (Fastball, Curveball, Slider, SSW Demo ↘, SSW Demo ↖, Knuckleball), Catcher view only PitchSim First (one-time purchase): All 15 pitches, 4 views, Freeze, Pitch Comparison, Stats, and SSW auto-optimization Design pitches. Understand the physics. No ball required.

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· SSW (Seam-Shifted Wake) effect now implemented · Added Cutter, Sinker, and 2 free SSW demo presets (11 → 15 pitches) · Knuckleball now available for free · Pitch comparison expanded to up to 8 · Physics engine accuracy improvements

Version 2.1

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
    5 MB
    Category
    Sports
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026 HIROSHI YASUNAGA
  • Privacy Policy

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