Markup or … markup?
The iOS markup is on your Apple devices and it does most of what this claims to do. Add Stitch Photo and it is all there with lesser clutter and less frustration. Markup doesn't have “zoom with loupe” or the tool for enhancement of a particular area but it's easy to get the same results. Stitch Photo is the easiest and most versatile photo stiitcher I've found so you’ll probably prefer it over any other.