I've used Strelok, Shooter, Trasol, AB, Ballistic AE, 4DOF, and I'm sure quite a few others. I now use 4DOF almost exclusively, but I wouldn't hesitate to use my old Kestrel 4500 with AB if I had to. The two provide solutions well within 0.1 mils of each other
EDIT: I just saw you said you're looking for one on your iPhone 12. As long as you have good velocity, BC, and other data, they're all going to be fairly close to one another