See every swing. Improve every shot.
A desktop app that sees your swing on camera, records it the instant you swing, and loops the replay right on top of your simulator. No microphone required.
- No mic
- Camera-based trigger
- 4 cams
- USB + phone angles
- 0.1×
- Slow-mo replay
Features
Everything you need
Built specifically for golf simulator setups. Every feature designed to help you improve without leaving your bay.
Sees Your Swing
No microphone, no impact-sound tuning. ReplaySwing watches the camera: you settle at address, you swing, it records. Practice waggles and people walking by don’t fire it.
Never Misses the Backswing
A rolling buffer keeps the seconds before the trigger, so every clip includes your full setup and backswing — not just the follow-through.
Phone Camera in Ten Seconds
Scan a QR code and your phone becomes a wireless camera in its browser. No app to install, no IP addresses to type. Video stays on your Wi-Fi.
Replay on Your Sim Screen
A floating overlay sits on top of your simulator and mirrors the app — live view between shots, looping replay right after each swing.
Multi-Camera Angles
Record face-on and down-the-line at once — up to four USB cameras and phones, all captured from the same trigger.
Instant Replay
Looping playback starts automatically after every shot, and you stay armed — just step up and hit the next ball.
Slow Motion
Slow any replay down to a tenth speed to study the moment through impact frame by frame.
Compare Swings
Put two swings side by side on one synced timeline — today’s against a reference from last week — and nudge them into alignment at impact.
Drawing Tools
Draw swing-plane lines and alignment circles right on the video. They stick to each camera and show up on the replay and the sim overlay.
Session Library
Every shot lands in a session with thumbnails. Browse past sessions and replay any swing with one click.
Send to Your Phone
Beam any clip to your phone with a QR code, or save it anywhere on your PC. Everything stays on your local network.
Pin Favorite Shots
Pin your best swings for quick access, delete the mishits.
Free & Open Source
MIT licensed. No subscriptions, no accounts, no data collection. Yours forever.
How it works
Up and running in minutes
No complex setup. No configuration headaches. Just plug in and play.
Set Up Your Camera
Plug in a USB camera — or scan a QR code and your phone becomes a wireless camera in its browser. No apps, no IP addresses.
Arm & Swing
Hit Arm and take your shot. The app watches the camera — when you settle at address and swing, it records automatically. No microphone needed.
Review Instantly
Your swing replays automatically in a floating PiP window right on top of your simulator screen.
PiP overlay
Replay without leaving your sim
The Picture-in-Picture window floats on top of everything — your simulator software, launch monitor, any full-screen app. After each shot, your swing replays automatically.
- Drag and resize the overlay anywhere on screen
- Loops automatically — study your swing on repeat
- Adjustable playback speed down to 0.1×
- Always on top — works with any simulator software
Download
Download ReplaySwing
Free and open source. No account needed, no strings attached.
Support
Support the project
ReplaySwing is free and open source. If it's helped your game, consider dropping a tip.
Report a bug
Something broken?
Let us know and we'll fix it. Reports go straight to GitHub.