Record reaction videos on iPhone with both cameras at once

The usual setup is a phone on a tripod aimed at your face and a laptop playing the clip. Then you drag both files into an editor and nudge one track until the laugh lands on the joke.

Sync drift is the part nobody warns you about. Two devices start a few frames apart, and the gap widens over a long take, so one offset never fixes the whole thing. Eventually you are cutting on feel.

DualCapture runs both iPhone cameras through one recording session, so the front and back streams share a clock. Your reaction sits where it happened. There is nothing to line up afterwards.

Split screen stacks the two cameras top and bottom, or sets them side by side. Drag the divider to decide how much room each one gets. Double tap it to snap back to even. Picture-in-picture floats your selfie camera in a corner of your choosing over a full-frame back camera.

For reacting to something on a screen, the stacked split usually wins. Your face takes the top at full width and the thing you are watching takes the bottom, so neither gets cropped into a letterbox. For reacting to something happening in front of you, PiP keeps the scene big and tucks you into a corner where you are still readable.

The divider has a swap button. Tap it mid-take and the cameras trade places, and the merged file follows the change.

One tap on the record button writes five files to your Photos library: a vertical merge, a horizontal merge, the front camera on its own, the back camera on its own. That is the whole set, no export step.

The separate clips are the reason to shoot in this app rather than fixing it in post. If the reaction is great but the layout is wrong, both originals are still there and you can rebuild the edit however you like. Want your face alone for a thumbnail? Already saved. Want to cut the reaction over a screen recording instead of the back camera? The front clip is a normal video file.

Exports carry no watermark and recordings have no time limit.

Hold the phone the way the finished video will be watched. The app writes a horizontal merge either way, but framing it right beats cropping it later.

Turn stabilization on in Settings if you are moving around. It runs on the back lens and trades a little field of view for a steadier frame. The self-timer runs 3, 5 or 10 seconds, enough to get your face into the top half before anything records.

Zoom on the back camera runs .5x through 3x while you record, so you can push in on a detail without touching the front framing.

DualCapture needs iOS 18 or later and an iPhone with multi-camera support, which means iPhone 15 or newer. Downloading is free. Premium adds 4K, every layout and unlimited exports, sold weekly, monthly, yearly or as a one-time lifetime purchase.

Worth knowing before you pay for anything: iOS 26 added a Dual Capture mode to Apple's own Camera app. It records front and back into one video with the selfie as a small overlay you can drag around the screen, and on the Pro phones you can change rear lenses mid-take. It costs nothing. The catches are that it only runs on iPhone 17, iPhone 17 Pro, iPhone 17 Pro Max and iPhone Air, the layout is locked, and you get one merged file with no separate clips. If that covers your reactions, use it.