How to Use Two iPhones for Golf Swing Replay

What the two-device golf swing setup does

One iPhone records the swing. A second iPhone shows the replay close to where you hit. SwingLoop connects them directly, detects each swing on the filming device, and sends the finished clip to the replay screen.

The goal is simple: preserve both camera position and practice rhythm.

With a conventional one-phone recording setup, the phone has to sit far enough away to capture the whole body and club. That usually puts the screen out of view. Reviewing the shot means walking to the camera, touching the phone, finding the clip, and then returning to the ball.

With two devices, the camera never has to move. The replay screen can sit near your next ball, mat, bag, or range bucket. You finish the shot, look toward the second screen, and see the swing while the physical feel is still recent.

What you need

Before leaving for the range, gather:

• two compatible iOS devices running iOS 16.4 or later;
• SwingLoop installed on both devices;
• an active monthly or yearly SwingLoop subscription;
• a stable tripod, clamp, phone stand, or protected bag mount for the camera device;
• enough battery and storage for the practice session.

You can use two iPhones, two iPads, or one of each. One subscription works across compatible devices signed in to the same Apple ID. If the devices use different Apple IDs, each account may need its own access.

Initial download, purchase, restore, and occasional subscription verification require an internet connection. Open the app on both devices and verify access before going somewhere completely offline.

Set up both devices before the first swing

1. Install and update SwingLoop

Download SwingLoop from the App Store on both devices. Confirm that both are on the current app version. Mismatched versions can make connection troubleshooting harder, especially after a feature update.

2. Keep Wi-Fi and Bluetooth on

The two devices do not need to join a Wi-Fi network, but the Wi-Fi and Bluetooth radios should remain switched on. iOS uses nearby connectivity to discover the other device and establish the direct session.

If iOS asks whether SwingLoop may find devices on the local network, tap Allow. Apple also lets you change this later under Settings → Privacy & Security → Local Network. The Apple Local Network privacy guide explains where that permission lives.

3. Choose Replay first

Open SwingLoop on the device that will sit near the mat and choose Replay. It will display the pairing screen and advertise itself to the nearby camera device.

An iPad makes a large replay monitor, but a second iPhone is often easier to position and protect at a busy range.

4. Choose Camera on the filming device

Open SwingLoop on the device that will be mounted behind or beside you and choose Camera. Pair it by scanning the QR code on the replay device or selecting the nearby replay device from the list.

Keep both apps in the foreground while pairing. Moving one app into the background can interrupt nearby discovery and disconnect an active session.

5. Confirm the connection

The replay device should move from its pairing screen into the replay experience. The camera device should show that it is ready to detect a swing. If the devices do not find each other, work through the no-Wi-Fi pairing guide.

Position the camera device

Choose either a face-on or down-the-line view and keep the camera fixed.

For face-on, place the lens opposite the golfer’s body midline and perpendicular to the target line. For down-the-line, choose a consistent line—commonly through the hands at address or the coach’s preferred reference—and point the camera parallel to the target line.

In either view:

• start with the lens around hand height;
• include the golfer from shoes to head;
• leave room for the entire club at the top and finish;
• avoid severe backlighting;
• keep the device outside the hitting area and safe from balls and clubs.

Use the complete golf swing camera-placement guide to build a repeatable face-on or down-the-line setup.

Position the replay device

The replay screen should be easy to see after the finish but should never sit where it distracts you at address or can be struck.

Good locations include:

• on a stable stand beside the mat;
• against a range bucket outside the hitting line;
• secured to a golf cart or push cart;
• on a shelf beside a home net;
• on a protected table in a simulator bay.

Angle the screen toward your normal post-shot eyeline. If you have to step out of the bay or turn completely around, the second screen is not solving the original problem.

Keep the replay device shaded when possible. Direct sun can make a phone screen harder to see and can heat the device during a long session.

Choose replay speed and delay

SwingLoop can replay at full speed, half speed, or quarter speed. A slower setting helps expose positions, but full-speed playback is still useful for judging rhythm and balance.

The replay delay can run from immediate to fifteen seconds. Start with a short delay, then adjust it to match your routine:

• Use zero to two seconds if you finish, hold the pose, and look at the screen immediately.
• Use three to six seconds if you prefer to watch the ball flight first.
• Use a longer delay if the replay screen is slightly behind you or if your practice routine includes a note after each shot.

The best delay is the one that starts the clip after your eyes reach the screen, not while you are still tracking the ball.

Run a test swing

Before beginning the practice block, make one normal full swing.

Check the camera device:

• Did it recognize the complete move rather than a waggle?
• Are the head, feet, hands, and club still inside the frame?
• Is the image bright enough to see the body clearly?

Check the replay device:

• Did the clip arrive?
• Did it start at a useful time?
• Is the chosen speed useful for the movement you are practicing?
• Can you see the screen without leaving the hitting area?

If detection is too eager or too slow, adjust sensitivity and hold timing in the app. Change one setting at a time, then run another test swing.

Build a useful practice loop

Automatic replay is most valuable when it supports a focused practice plan rather than turning every frame into a new swing thought.

Try this sequence:

1. Choose one movement or outcome to observe.
2. Hit one ball at normal speed.
3. Watch the replay once.
4. Make one clear interpretation—not five.
5. Rehearse the intended change.
6. Hit the next ball while the previous feel is still available.

Recent swings remain available during the replay session. Save the examples that matter. Add a label for the club, drill, view, or swing thought, and compare two saved swings side by side when that comparison answers a specific question.

For example, compare the first successful repetition with a later one from the same camera angle. Avoid comparing different angles or different clubs and assuming every visual difference came from technique.

Save and share the right clips

You do not need to keep every swing. Save a small set that documents the session:

• a baseline swing before the change;
• the clearest attempt at the drill;
• the best transfer swing without the drill;
• one miss that illustrates the pattern;
• a final swing for the next session’s starting point.

Label saved swings so they are easy to filter later. When asking a coach for feedback, share the full-speed clip along with the slow-motion version if possible, and tell them whether the camera was face-on or down-the-line.

Use two iPhones without range Wi-Fi

SwingLoop’s replay session is device to device. It does not require a range Wi-Fi network, Personal Hotspot, IP address, or cloud video upload.

Wi-Fi and Bluetooth still need to be on because they are the radios iOS can use for nearby discovery and peer-to-peer transfer. Apple’s Multipeer Connectivity documentation describes support for nearby discovery and communication over infrastructure Wi-Fi, peer-to-peer Wi-Fi, and Bluetooth.

If the range has no network at all, verify the subscription before you arrive, keep both radios on, grant Local Network access, and leave the apps open during pairing. The detailed offline pairing checklist covers the exact recovery steps.

End the session cleanly

Before closing the apps:

1. Save or share any temporary replay you want to keep.
2. Confirm important clips appear in the Saved area or in Photos after export.
3. Disconnect the devices through the app if a control is shown.
4. Close or leave the Camera and Replay screens.
5. Pack the filming stand before collecting loose balls or clubs around it.

The next time you practice, reproduce the camera height and alignment first. Consistent filming plus immediate replay gives you something more useful than a folder full of unrelated swing clips: a repeatable feedback loop.