2/5 rating based on 3 reviews. Read all reviews for Passport Camera -ID Photo Edit for iPhone.
Passport Camera -ID Photo Edit is free iOS app published by Li Lian Liang
PhelineCat
They can't be edited for passports either. Your state department website has the guidelines; the US State Department has examples of right and wrong photos. I think there's been an international standard since post World War One. Other options will be fine for "passport style" photos but don't delay your passport application by mistakes in photos.