I used to use an app called Autostitch Panorama Pro, back in the day. Years ago, Google bought it out and shut it down, which was a shame because it was - without question - the best app for stitching together photos into a panorama. By which I mean : you take a dozen or so photos with overlap between them, and then stitch them after the fact. BimoStitch finally does this again. No subscription, one-time payment, all processing done on-device. And the results are pretty damned amazing. I have questions about the autoexposure when you have overlapping pictures with radically different exposures but it does do a more-than-reasonable job. The kicker is that it will do multi-row stitching and 360° stitching so you can - if you want - stitch together a huge number of photos to create a high resolution photosphere. This is WAY better than the built-in panorama function in the iOS camera app. So pleased to have found this.
Thanks very much for a wonderful review.