PROSwing

ProSwing - Baseball Swing Analysis App & AI Hitting Coach

ProSwing - Baseball Swing Analysis App & AI Hitting Coach

Turn any phone or webcam into a swing analysis lab. No sensors. No expensive hardware. 100% Local and Private. Compare your swing against baseball's greatest!

Free mobile baseball video analysis — start tracking your swing in seconds.

Drop video or click to upload

Supports MP4, MOV, AVI, JPG, PNG, WebP up to 500MB

High-Speed Analysis

Frame-by-frame breakdown at 240fps equivalent

AI Baseball Hitting Coach

Automated biomechanical feedback powered by MediaPipe skeleton tracking

Pitch Swing Synchronization Software

Multi-dimensional tracking maps your bat path against incoming pitch profiles

How PROSwing Analyzes Your Swing

Professional-grade analysis based on biomechanical research

Core Swing Matrix
Load0–25%
Contact

The wind-up — weight shifts to the back leg, hands set, eyes lock on the pitcher.

Head StabilityWeight: 20%

Target: < 2 inches drift

Head Stability — Keeping your head still so your eyes track the pitch

Think of your head as a camera on a tripod. Any drift blurs the picture. Keep your chin level and let your eyes do the work — you'll pick up spin and location earlier.

Launch25–50%
Power

The trigger — stride begins, hips fire first, hands stay back to create torque.

Hip-Shoulder SeparationWeight: 20%

Target: 45–55°

Kinematic Sequence — The chain of energy transfer — pelvis → trunk → arms → bat
Trunk Vector — A directional line from hip to shoulder measuring upper-body rotation
Pelvic Angular Velocity — How fast your hips rotate — elite hitters peak at ~600°/s

This is where power is born. Feel your belt buckle start rotating toward the pitcher while your hands stay back — that stretch across your core is the elastic energy that turns into bat speed. The more separation, the more whip.

Contact50–75%
Efficiency

The collision — bat meets ball, body position determines outcome quality.

Bat SpeedWeight: 20%

Target: 65–75+ mph

Attack Angle — Vertical bat path angle — optimal is −6° to +6°
xContact Probability — Modeled % predicting quality contact vs. pitch type
Squared-Up Rate — How squarely bat meets ball — higher = harder hits

At impact, your body should feel like a coiled spring releasing. Your hands drive through the zone on a slightly upward plane that matches the pitch's downward angle. Focus on meeting the ball out front — that's where barrel control lives.

Follow-Through75–100%
Power

The finish — full extension, balanced deceleration, evidence of efficient energy transfer.

Lead Arm AngleWeight: 15%

Target: 160–180°

Lead Arm Angle — Front arm extension at contact — optimal is 160–180°
Back Elbow Position — The 'Power L' shape of your trailing arm — keeps the swing compact

A long, balanced finish tells you the swing was efficient. If you're falling off the plate or cutting short, you leaked energy somewhere. Let the bat wrap naturally around your back — your body knows when the swing was right.

How Swings Are Scored

Each metric is scored 0-100, then combined using weighted averages into an overall grade.

A+95-100
A90-94
B80-89
C70-79
D60-69
F< 60
Example Score CalculationA - 92/100
Head Stability
9520%
Attack Angle
8815%
Hip-Shoulder Sep.
9220%
Bat Speed
9020%
Lead Arm Angle
9415%
Back Elbow
9110%

Compare Against the Best

See how your metrics stack up against MLB's elite hitters

Ken Griffey Jr.

SEA · Historical Power/Speed

Historical Power+Speed
Bat Speed76.5 mph
Swing7.5-8.3 ft
Attack13°-16°
Squared38%

Iconic lefty swing with effortless power and exceptional hand-eye coordination. Widely regarded as the most mechanically pure swing in baseball history.

Trea Turner

PHI · Speed-First Compact

Speed
Bat Speed68.2 mph
Swing5.5-6.3 ft
Attack7°-10°
Squared37.8%

Elite speed paired with an ultra-compact swing. Maximizes contact and baserunning value through quick hands and efficient bat path.

Amateur Baseline

REF · User Reference Profile

User Reference
Bat Speed52 mph
Swing6.5-7.8 ft
Attack4°-12°
Squared22%

Optimized for mobile-grade video capturing. Accounts for YOLOv8-pose 17-point structural constraints, motion blur, and perspective distortion.

Luis Arraez

SD · Contact Outlier

Contact
Bat Speed62.4 mph
Swing4.4-5.9 ft
Attack6°-8°
Squared43.7%

Ultimate contact baseline. Shortest swing path in Major League Baseball, maximizing barrel control to offset low raw velocity.

Ready to see your swing score?

Upload your video above
100% Client-Side Processing
MediaPipe Pose Detection via WebAssembly
Statcast-Calibrated Biomechanics

Frequently Asked Questions

How does browser-based computer vision analyze a baseball swing?+
PROSwing uses MediaPipe Pose Detection to track 33 body joint landmarks in real-time at 30+ FPS via WebAssembly. The engine captures keypoint coordinates for the shoulders, elbows, wrists, hips, knees, and ankles through every frame of your swing. These coordinates feed into a biomechanical computation pipeline that calculates the kinematic sequence — measuring the rotational velocity transfer from pelvis through trunk to upper body. The vector dot product between the hip vector and shoulder vector yields the Hip-Shoulder Separation angle, while lead arm atan2 computation determines Attack Angle. All processing runs locally in the browser with zero server uploads.
What is Hip-Shoulder Separation (HSS) and why does it matter?+
Hip-Shoulder Separation — also called the ‘X-Factor’ — is the angular difference between pelvic rotation and shoulder rotation at foot plant. PROSwing calculates this using the vector dot product between the trunk vector (mid-hip to mid-shoulder) and the pelvis vector. Elite hitters generate 45–55° of separation, creating elastic energy in the core musculature. This stored energy drives the kinematic sequence: the pelvis rotates first (pelvic angular velocity peaks ~600°/s in MLB hitters), followed by the trunk, then the arms. Greater HSS correlates with higher bat speed and exit velocity. The app uses a 5-frame moving average low-pass filter to smooth angular velocity readings and reduce noise from pose detection jitter.
How do I fix a loopy swing and improve my extra-base hits?+
A loopy swing — where the bat path deviates excessively from the ideal plane — is one of the most common mechanical issues in amateur hitters. ProSwing's proprietary SLAP (Swing Length Above Predicted) metric quantifies exactly how far your swing deviates from your personalized baseline. Data shows that extra-base hits like doubles feature the tightest, most accelerated swing paths (6.95 ft average), while outs exhibit the longest swing length (7.56 ft) despite having higher raw bat speed. To fix a loopy swing, focus on compact hand path drills: the STEP Drill increases hip-hand separation for cleaner bat speed, the FRONT Drill (tucking a ball in your lead elbow) prevents early arm casting, and the BACK Drill (ball between trailing bicep and forearm) forces rotational acceleration through the core. Keeping your swing path compact improves barrel control and directly increases your extra-base hit potential.
Are these hitting analytics matched to real Statcast data?+
Yes. PROSwing’s matchup engine maps browser-computed metrics to Statcast-equivalent values. The xContact Probability models the likelihood of barrel contact based on your attack angle, bat speed, and swing length against specific pitch variables — including sinker arm-side run, sweeper horizontal break, and pitch spin rates. The Squared-Up Rate estimates how squarely the bat meets the ball using timing and plane alignment. These calculations are calibrated against MLB average Statcast data: average exit velocity (88.6 mph), launch angle distributions, and barrel percentages. The hitter profile system includes real archetypes (Arraez contact-first, Stanton power, Williams balanced) with target benchmarks matching their documented Statcast outputs.

Biomechanics by Swing Phase

Load

Head Stability

Keeping your head still so your eyes track the pitch

Launch

Kinematic Sequence

The chain of energy transfer — pelvis rotates first, then trunk, then arms, then bat

Trunk Vector

A directional line from hip to shoulder that measures upper-body rotation

Pelvic Angular Velocity

How fast your hips rotate — elite hitters peak at ~600°/s

Contact

Attack Angle

The vertical angle of your bat path through the zone — optimal is −6° to +6°

xContact Probability

A modeled % predicting quality contact based on your biomechanics vs. the pitch

Squared-Up Rate

How squarely the bat meets the ball — higher = harder, more consistent hits

Follow-Through

Lead Arm Angle

Extension of your front arm at contact — optimal is 160–180°

Back Elbow Position

The 'Power L' shape of your trailing arm — keeps the swing compact

© 2026 PROSwing. All rights reserved. Built with Next.js, MediaPipe Pose Detection, and Chart.js.

Swing analysis powered by 33-joint skeletal tracking and Statcast-equivalent biomechanical computation.