The story of your
next practice session.

SwingStudio captures, detects, and organizes every swing automatically — on iPhone, iPad, and Mac. No buttons. No timing. Just practice.



Chapter One

You Arrive at the Range

You pull into the lot, grab your bag, and walk to your usual bay. The sun is low and the range is quiet. You set your phone down, open SwingStudio, and start warming up.

You don't hit record. You don't have to. SwingStudio has been capturing for over 60 seconds already — a dual-file rolling buffer that never stops, never misses. Every moment of video is there, written continuously to storage, waiting for something worth saving.

You've set it to 240 frames per second today. Every micro-movement of your downswing will be there to study — the clubhead lagging behind your hands, the wrists unhinging through impact. You've also dialed your clip duration to 5 seconds: a tight window around each swing, no wasted footage. Tomorrow you might stretch it to 15 seconds to capture your full pre-shot routine. The range is 3 to 45 seconds, yours to decide.

240 fps High-speed capture, every micro-movement preserved
How it works: A dual-file AVAssetWriter system rotates between two recording segments, ensuring seamless, gap-free video capture. When a swing is detected, the relevant footage is already in the buffer — it simply gets extracted and saved.

Chapter Two

You Set Up Your Devices

You prop your iPhone behind you, angled down the line. You open your iPad on the bench beside your bay. They find each other instantly — no pairing menus, no codes, no configuration screens.

Your iPhone becomes the camera. Your iPad becomes the studio. The roles are assigned automatically based on the device: iPhones film, iPads review. It takes less than a second.

Zero configuration Peer-to-peer device discovery

Before you step away from the phone, you turn on flash alerts. Each time a swing is detected, the camera's torch fires — a quick confirmation without looking at the screen. You could set it to a chime instead, or turn it off entirely, but today the flash feels right. A silent pulse of light that says got it.

From this point on, every swing your iPhone captures appears on your iPad in real time. You can review, annotate, and compare without ever picking up the camera.

How it works: Multipeer Connectivity with asymmetric discovery — cameras advertise, studios browse. Role assignment is automatic and safeguarded: an iPhone can never accidentally become a studio, and vice versa.

Chapter Three

You Swing

You take your stance, address the ball, and swing.

Before the ball lands, SwingStudio has already found your swing. Vision pose estimation tracked your body at 15 frames per second. A motion energy algorithm detected the moment of action. A clip was extracted, trimmed, and saved — all before you look up.

~15 fps Real-time pose estimation

There is no shutter button. No start and stop. The app watches for the signature energy pattern of a golf swing — the sudden acceleration of wrists, shoulders, and torso — and captures exactly the right window of video. Pre-padding before the swing, post-padding after. Every clip is precisely framed.

SwingStudio also recognizes how you're filming. It detects whether the camera is positioned face-on or down-the-line and adjusts its detection algorithm accordingly — different angles produce different body-joint signatures, and the system adapts automatically. You don't select a mode. You just set up the camera and swing.

How it works: Apple's Vision framework estimates body pose in real time. A heuristic energy algorithm analyzes joint motion across a sliding window, triggering clip extraction when the energy signature matches a swing. Camera angle detection selects the optimal algorithm variant — face-on or down-the-line — each tuned with its own energy thresholds and joint weighting. Thresholds and timing are configurable per variant.

Chapter Four

You Review

Back at the bench, you open your latest clip. You pinch to zoom in 5x on your grip position, studying the pressure points in your fingers. You double-tap to snap back to the full frame. You draw a line along your spine angle at address. You circle your hand position at the top of the backswing. You add an angle measurement to your club face at impact.

Then you pull up a reference swing — a pro's fluid motion from your reference library — and compare them side by side, frame by frame. Two panels, independent playback controls, annotations overlaid on both.

5x zoom Pinch to zoom, double-tap to reset

Lines, circles, boxes, angles. Multiple colors, undo and redo. The annotation tools are simple enough to use standing over your phone, precise enough to study the smallest details of your mechanics. And everything persists — come back to any clip and your notes are still there.

When you're satisfied, you export the clip with annotations burned in and send it to your coach. The lines, the circles, the angle measurements — all composited into the video, ready to share through any app on your phone.

You add a quick note: #grip adjustment, feeling the rotation better today. The tags autocomplete from your history — you've used #grip before, and SwingStudio remembers. A few words now save minutes of searching later.

What's included: Full annotation toolkit (lines, circles, rectangles, angles, freehand), multi-color palette, undo/redo stack. Annotation export with compositing — burn drawings into the video and share via the system share sheet. Two-up comparison panels with independent playback. Reference swing library with import from Photos and Files. Pinch-to-zoom up to 5x with double-tap reset. Inline #hashtag notes with autocomplete and cross-library search.

Chapter Five

You Come Back Tomorrow

Tomorrow, you'll pull up today's session from your history. You'll see every swing, organized in a clean feed — filterable by club, searchable by date, grouped into sessions. A visual timeline of your practice.

You'll notice the change in your takeaway from last week. You'll see the spine angle correction you've been working on start to stick. The progress is there, documented swing by swing, session by session.

Session by session Organized practice history

You import a video your playing partner filmed from a different angle. It drops right into today's session with the metadata extracted automatically — date, duration, location. Two camera angles on the same swing, organized together.

That evening, you open SwingStudio on your Mac. The same sessions, the same clips, the same annotations — all there on a bigger screen. You pinch into your grip position, scrub frame by frame, and compare today's swing against last week's. Offline analysis on a display built for detail.

You search #grip and every tagged session appears instantly. Three weeks of grip work, laid out chronologically. The change is obvious when you see it all at once.

SwingStudio doesn't coach you. It doesn't tell you what's wrong. It gives you the footage, the tools, and the history to figure it out yourself — or to share with your instructor. It's a practice journal that writes itself.

Session history: Instagram-style feed with filter chips, grid and feed view toggle, date-grouped sessions. Import videos from Photos or Files with automatic metadata extraction. Inline #hashtag notes with autocomplete and cross-session search. Every swing is automatically cataloged — ready for review whenever you are.

Under the Hood

Capture Buffer ~60s rolling buffer with dual-file AVAssetWriter rotation. Seamless, gap-free recording.
Pose Estimation Apple Vision framework. Full body pose at ~15 fps during capture.
Swing Detection Heuristic energy algorithm with configurable thresholds. Multi-joint confirmation.
Connectivity Multipeer peer-to-peer. Asymmetric discovery with automatic role assignment.
Annotations Lines, circles, rectangles, angles, freehand. Multi-color palette, undo/redo.
Comparison Two-up panels with independent playback and shared annotation visibility.
Reference Library Import swings from Photos and Files. Tag, favorite, and compare against your own.
Session History Date-grouped, filterable feed. Grid and list views. Automatic session organization.
High-Speed Capture Up to 240 fps. Configurable quality and compression. Clip duration from 3 to 45 seconds.
Export Annotation compositing burned into video. Share via system share sheet to any app.
Notes & Tags Inline #hashtags with autocomplete from history. Cross-library search across all sessions.
Swing Alerts Sound chime or camera flash notification on each detected swing. Configurable or off.
Video Zoom Pinch-to-zoom up to 5x during review. Double-tap to toggle between zoomed and full frame.
Platform iOS 17+ / macOS. iPhone, iPad, and Mac — native on all three. Built with SwiftUI and Swift Concurrency. No third-party dependencies.

Start your next practice session
with SwingStudio.

Download