There's no shortage of camera apps for iOS but THIS one is better than most. It's headline feature is removing the auto-processing that Apple does in the default camera app and I gotta say, it's great.
https://www.nofusion.app/en / https://apps.apple.com/app/id6444706244
Here are blog posts with photo examples:
https://www.fabriziomusacchio.com/weekend_stories/told/2025/2025-11-23-ios_no_fusion_app/
https://www.alexarmitage.com/blog/2026/2/14/complete-guide-iphone-no-fusion
I still use the mood camera app (https://mood.camera/) too but No Fusion has a Fujifilm recipe in it, for when I want neutral photos.