During my time in professional baseball, including roles as a Hitting Coordinator and Major League Hitting Coach with the Houston Astros, and now as the Farm Director with the Chicago Cubs. I’ve been fortunate to work with some of the best minds in player development. Across those environments, Video Delay Instant Replay has been one of the most consistently valuable tools we’ve used.
Frustrated by making the same mistakes? Turn your device into a sports mirror that replays your actions with a delay. Watch, correct, and improve your form in real-time. Hands-free video feedback for more efficient and satisfying training.
💡 Pro Tip: Swipe the screen to enter Dynamic Buffer and extend the delay on the fly.  Never miss a moment!
Replay in slow motion or inspect frame by frame for in-depth movement analysis. Highlight elements needing refinement: add visual markups, measure angles and time.
Annotate the video and share clips with players. Track your athletes’ progress and assess how changes in technique impact their performance.
Available only on iOS devices.
The VDIR app provides instant video feedback by displaying a delayed replay of actions, allowing athletes and coaches to analyze and improve performance without needing to press record.
Yes, the Video Delay Instant Replay app is available on the App Store for iOS devices and Google Play for Android devices. However, iOS and Android apps have different features. Most of the features described on this website apply to the iOS version of the app. For details on the Android app feature list, please check out the description on Google Play.
You can record your training sessions using the video delay app. Recording in DELAY mode starts when you hit the record button and captures one video file. Recording in SLO-MO mode* captures each slow-motion replay as a separate video. Videos are saved to your device’s Photos or Documents folder. You can select where to save the recordings in the app settings.
*Works only on iOS devices
You can connect your device to an external monitor or TV to provide more precise feedback during training sessions. This benefits coaches who want to display instant replay to multiple athletes simultaneously or when working out in a larger sports facility. To share the screen on iOS devices, use AirPlay or HDMI cable.
You can connect two iOS devices with the installed VDIR app. One device, let’s say an iPhone, can work as a camera capturing your actions. The other, let’s say an iPad, can receive the camera feed and work as a remote control for the app.
How to stream between Apple devices using the REMOTE CAMERA feature:
1. Open the Video Delay app on the devices you would like to connect.Â
2. On the Start Delay Screen, tap the [Remote] button.
3. On your iPhone, select Stream and tap [Start Stream]
4. On your iPad, select Control, tap [Join & Control], and enter the code to connect.Â
 Note: You can stream from both iPhone and iPad.
The app’s Replay View, available on iOS devices, allows for accurate movement analysis. You can watch your actions in slow motion or frame-by-frame and measure angles to check your technique. You can also precisely select a crucial part of your actions using A & B markers and save it for further assessment.
Yes. Drawing tools let you add on-screen markups to make your feedback clearer. Just click the Pencil button to get started. First, pick a color, then choose the tool you want. Slide your finger across the screen when drawing lines and freehand shapes. To measure angles, tap twice. You can also add a vertical or horizontal line in the center of the screen to ensure perfect pose alignment during each repetition. Once you are finished with your markup, press Done. Later, you can choose whether to save the videos with or without the markup.
The app is versatile and can be used by individual athletes or sports teams for various activities, like baseball, volleyball, gymnastics, golf, swimming, archery and tennis. It’s recommended for assessment when working out alone and for training sessions with a coach, including softball, football, weightlifting, martial arts, pilates, or even physiotherapy. Coaches can also utilize it to analyze team drills in sports like soccer, basketball, cricket, and water polo. Gyms and sports facilities for gymnastics training or dance practice can also benefit from a video delay system.
No. When using the app for delayed video feedback without recording, the camera frames are temporarily stored in the device’s RAM and continuously refreshed. The buffer memory is cleared every time you exit the app.Â
Yes! External screen rotation is now fully supported and works great. It especially useful for golf coaches and gyms with vertically mounted TVs.
→ See step-by-step setup with screenshots
Yes, you can use two cameras at the same time. To set up Split Screen with different cameras, follow these steps:
On the Start Delay Screen, tap the [Split] button -> on the Split Screen, tap the [Remote] button -> select the camera feed you would like to add: Control (for Apple devices), GoPro, or IP, and follow the instructions to connect.
This way, one side of the Split Screen will display the camera feed from your device (like an iPad or iPhone), while the other side will show the Remote Camera. You can also set a different delay for each camera feed.
Example: Swimming coaches use dual cam support, combining an underwater camera with the device’s own camera, to collect more feedback on swimmers’ mechanics.
Absolutely! You can use your Android phone as a high-quality webcam for the Video Delay app.
Yes, provided your Android device supports USB-C webcam mode (standard on devices like Google Pixel) and your iPad has a USB-C port.
Open the Video Delay app on your iPad.
Connect your Android phone to your iPad using a USB-C cable.
On your Android device, open USB Preferences.
Scroll to “Use USB for” and select Webcam.
The Video Delay app should now recognize your phone.
You can then adjust the resolution and frame rate (fps) inside Video Delay by going to Settings > Video format.
