FREE BUILT INTO IOS – Photo Stitch - Panorama Camera Review

You can do this already with iOS 12 for free much more reliably, search for the “shortcuts” app built into iOS, search for “images” shortcut, one allows you to stitch them in any way you want side by side up and down 4x4 or 1x1 etc
Review by Five0hFour on Photo Stitch - Panorama Camera.