Call
Doubleback on the open iPhone Duo, filming a courthouse press conference with the front camera inset and a station logo on the frame

Doubleback on the iPhone Duo: both cameras rolling, the picture edge to edge, every control clear of the shot.

Innovate / Camera app / iPhone

Doubleback

Reporters, campaigns, and local businesses film on a phone that records one camera at a time, and the moment that matters is usually over before anyone hits record. Doubleback records both cameras at once, and every take starts two minutes early.

Engagement
Product strategy, app design, iOS software, website, and launch
Scope
Product strategy, app design, dual-camera recording, two-minute pre-roll, layout engine, logo branding, iPhone Duo layouts, App Store launch, one-time upgrades, website
6 days

From the first sketch of the iPhone Duo layout to the App Store approving it, on a phone nobody had held yet

2 anglesThe rear and front cameras record at the same time, up to 4K on both, and both files stay untouched
2 minOf pre-roll. Even in standby the app is filming, so the take starts before anyone presses record
1stDual-camera app ready for the iPhone 18 and the iPhone Duo, built and tested before either reached a store
$0To start. Everything is on from the first take, with one-time upgrades and no subscription

The problem

A reporter doing a stand-up wants the scene and their own face in the same shot. So does a volunteer filming for a campaign, or a pool contractor walking a job. A phone camera gives them one or the other. And the moment that matters, the shout, the goal, the crowd coming around the corner, has usually passed by the time anyone presses record.

Where it came from

The answer was already working in a hunting app. Enter360 built PREYR’s pro video for hunters, who miss the shot the same way: KILLSHOT keeps two minutes of pre-roll, and 2SHOT films both cameras at once. The tools turned out to be bigger than hunting. Doubleback took them out of PREYR and rebuilt them as a camera of their own, for anyone who films the news, a campaign, or their own business. The PREYR story.

What it does

Both cameras, two clean files. Turn on Dual and the rear and front cameras record together, up to 4K on both. A combined 2-shot is ready to post the moment the take stops, and both original files are kept untouched for an editor who wants to cut it properly later.

The take starts before you press record. In standby, Doubleback keeps a rolling buffer of up to two minutes of picture and sound. Press record late and the buffer goes on the front of the clip. One seamless take, from before and after the press.

Change the layout after the take. Which camera fills the frame, the corner, the size and the shape of the inset can all change after filming. Doubleback remakes the 2-shot from the two originals, as often as needed. No reshoot.

Your logo on every clip. A station, a candidate, or a business puts its own logo or handle where the Doubleback watermark would go.

Doubleback filming a youth soccer game with two minutes of pre-roll on Both cameras at once: a reporter inset over a press scrum The Take screen: the rear file, the front file, and the 2-shot ready to post Layout controls: which camera fills the frame, the corner, the size and the shape A dual take outside a courthouse with the station logo on the frame A food review take with the Forkline logo on the frame

Who it is for

Reporters and newsrooms. Stand-ups and on-scene reports that look like the station, filmed on a phone.

Campaigns. Every volunteer’s video carries the candidate’s colors.

Local businesses. Pool companies, contractors, realtors: walk the job, talk to camera, post it with the logo.

The same pre-roll is why it works chest-mounted in a harness for security and law enforcement work, where the moment that matters has usually passed before anyone thinks to record.

A landscape dual take of a library march, the reporter inset in the corner and the Northside Report logo on the frame
Wide, with the reporter in the corner and the station's logo on the frame. Both originals stay clean.

Ready for the iPhone Duo before it reached a store

The iPhone Duo opens into a screen no iPhone has had, nearly square, and video is not. An ordinary app sits in a phone-shaped box with black beside it. So before the Duo reached a store, the studio sketched what a camera should do with that screen:

  • Fill it edge to edge and put the controls in the leftover strip, never over the picture.
  • A FULL format that records from the whole sensor, so the unfolded screen is the shot.
  • Half open on a table, the standing half is the picture and the flat half is a big clock, a zoom and a record button. No tripod.
  • The tent, a two-sided interview from one phone, each person on their own camera. Still on the drawing board.
The first sketch of Doubleback on the open DuoDoubleback recording with both cameras on the open Duo, the picture filling the whole screen
THE SKETCHSIX DAYS LATER, IN THE APP

The layouts and the FULL format shipped six days after the first sketch, built and tested on Apple’s simulator and approved by the App Store before the first pre-orders opened. The same release wires in the iPhone 18’s lens and camera controls, so a take can start and stop from the hardware without touching the screen.

The starting point: the app boxed in a phone-shaped window on Apple's Duo simulator Sketch: held wide, the picture runs edge to edge with the controls in the leftover strip Sketch: held tall, the picture runs full height with every control in one column Sketch: the FULL format, every pixel of the unfolded screen is the shot Sketch: half open on a table, the standing half is the picture and the flat half is the controls Sketch: what is on the screen when the Duo stands half open Sketch: the tent, seen from the side, one phone filming both people Sketch: what the interviewer sees on the Duo's outside screen in tent mode As built on the simulator: a take rolling with the picture at full height and the controls in a side column As built on the simulator: the Take screen on the Duo
From the boxed-in starting point to the sketches to the app running on Apple's simulator.

The business model

Free to download, with everything on from the first take. No account, no trial that runs out, and no upload: clips stay on the phone until they are shared. Shared clips carry a small Doubleback watermark, and two one-time upgrades pay for the app:

  • FreeEvery feature, with a small Doubleback watermark on shared clips
  • $4.99 onceClips go out clean. No subscription
  • $9.99 onceYour own logo or handle in place of the watermark

How it was built

Doubleback runs on PREYR’s camera core, built the same way: product strategy, design and direction from the studio, with a team of AI agents writing and testing the code. It runs on iPhone 15 Pro and later, on purpose. The newest cameras and chips are what make two cameras with a two-minute pre-roll possible. doublebackcam.com