Both angles.
Two clean files.

An iPhone camera that records the rear and the front at once, keeps both files untouched on one clock, and makes the ready to post version afterwards. With pre-roll, the take starts before you pressed record.

Coming to the App Store

Dual

Both cameras record together. You get the rear file, the front file, and a ready to post version with the second camera inset. Remake the inset any time without a reshoot.

Pre-roll

The camera is always holding the last stretch of picture and sound. Press record and that stretch is the start of your clip.

For the edit

Both originals ran on one clock. Drop them on a timeline and they line up on their own, no slate.

Free forever

Everything is on from the first take. Clips that leave your phone carry a small Doubleback mark. One purchase takes it off, for good.

Your files stay yours

No account, no upload, no analytics. Clips stay on your iPhone until you share them.

Which iPhones

iPhone 15 Pro and later. Dual needs two cameras running at once, which every supported phone can do.