PitchSim

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.