PitchSim

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.