FastpitchAIPitch-perfect mechanics.
FastpitchAI turns a phone video into biomechanical data built for softball pitchers. See elbow flexion, stride percentage, and windmill speed pitch by pitch, with no sensors and no expensive hardware.
Free during alpha. Download it today and help us build what comes next.
Get updates on new features and releases.
Built for Everyone in the Circle
Parent, athlete, instructor, or coach: everyone sees the same data, so everyone works on the same fix.
Parent
Do you know something looks off but struggle to explain it in a way she'll accept?
Athlete
Do you want to analyze your mechanics instead of guessing what to fix?
Instructor
Do your athletes respond better when they can actually see what needs to change?
Coach
Do you have a full staff of pitchers and not enough time to break down every rep?
How FastpitchAI Analyzes a Pitch
Our computer vision breaks down every delivery frame by frame, so you can coach what you see instead of what you guess.
1. Upload
Record in the app or upload a pitch from your camera roll. No sensors, no markers.
2. Analyze
Pose detection tracks the pitcher's body frame by frame and splits the delivery into six phases.
3. Improve
Every metric comes with an expected target range, so you know what the number means and what to work on next.
Join Our Softball Pitching Advisory Group
Join elite instructors like Nicole May and Kristina Thorson of Pitcher University in shaping the future of softball pitching analysis. We want your expertise to help build the ultimate tool for your athletes.
Get news & updates on FastpitchAI releases.
Everything In The App Today
Not a roadmap slide, not a mockup. This is what's live right now, in the build you download.
Bioskeleton Tracking
A full skeletal overlay tracks the pitcher automatically, on-device, the moment a video loads. No markers, no manual setup.
Automatic Phase Detection
Every windmill delivery is split into six phases on its own. If a marker lands off, drag it into place.
Camera Angle Detection
FastpitchAI detects whether the phone is side, front, or behind the pitcher, and which hand they throw with, automatically.
Multi-Pitch Slicing
Upload a full bullpen and FastpitchAI slices it into individual pitch clips on its own, ready to analyze one by one.
Side-by-Side Comparison
Compare two pitches, or two pitchers, in synced playback: same skeleton, same metrics, side by side.
Scrub, Draw, Narrate
Step frame by frame, slow the video down, draw over the mechanics, and record a voiceover walking through what you see.
Export With Metrics Burned In
Export the analyzed video with the skeleton, drawings, and metrics panel burned directly into the file.
Video Library & Folders
Organize sessions into folders by athlete or by week, so nothing gets lost in a long camera roll.
Progress Dashboard
Track every phase's metrics over time, pitch after pitch, session after session.
Key Metrics
Windmill Speed
Maximal arm speed through the circle. It's an output of good sequencing, not a number we chase directly.
Elbow Flexion
Benchmarked at every phase of the delivery. Efficient flexion transfers energy instead of leaking it, and protects the arm.
Shoulder Elevation
Benchmarked at the top of the backswing, where the arm's position sets up everything that follows.
Trunk Position
Forward lean through the load, lateral lean at release: staying balanced keeps the release point repeatable.
Knee Flexion
Scored on the drive leg before foot contact, then the stride leg after: your base for the whole delivery.
Stride Percentage
Stride length as a percentage of body height at foot contact, benchmarked against published research.
Questions, answered
Is FastpitchAI free?
Yes. FastpitchAI is completely free during alpha, on both iOS and Android. Download it, analyze pitches, and help us build what comes next.
What phones does FastpitchAI work on?
FastpitchAI runs on iOS and Android smartphones. There's no extra hardware to buy, just your phone's camera.
Does FastpitchAI require sensors or wearables?
No. FastpitchAI uses on-device computer vision to read biomechanics directly from a phone video: no sensors, wearables, or lab equipment.
What does FastpitchAI measure?
Six benchmarked metric families on every pitch: windmill speed, elbow flexion, shoulder elevation, trunk position, knee flexion, and stride percentage, tracked automatically across six phases of the windmill delivery.
How accurate is FastpitchAI's analysis?
FastpitchAI's biomechanics engine is built specifically for the fastpitch softball pitch, not general body tracking. Every phase, metric, and benchmark comes from published softball pitching research, the kind of specificity most fitness and movement-tracking apps don't have. Every metric we show is also phase aware and benchmarked.
Can I compare two pitches or two pitchers?
Yes. FastpitchAI's side-by-side comparison plays two videos in sync, with the same skeleton and metrics on both, so you can compare mechanics pitch to pitch or pitcher to pitcher.
Who is FastpitchAI built for?
Softball pitchers, private pitching instructors, coaches, and parents. FastpitchAI is Chekket's first product, focused entirely on fastpitch softball pitching.
What's next for FastpitchAI?
Full metrics for front and back camera angles, an Instructor Storefront for pitching instructors, 3D reconstruction research, and drill recommendations tied to what the analysis finds. Our team keeps pushing what a single phone camera can measure, and we'll keep shipping new metrics as soon as they earn our trust.