This app has been missed by every reviewer for years. I used it with my LG' phones for years but it didn't work with the S21 Ultra. Well, I just upgraded and the good news is, it works great with the S23 Ultra! No need for lenses or special devices, better than ExpertRaw's multi exposure as you can do this in the middle of the day with no extra equipment!
This is not my app, but I've used it for years. The creator doesn't do updates, but it's ad free, crashes occasionally, lol. But it does the job.
Not working on the latest version of Android...looks so cool though..:(