Adobe's mobile Lightroom app is slowly but surely becoming a viable alternative to Google Photos and Apple's Photos app with iCloud Photo Library.
In the most recent update to Lightroom for iPhone and Lightroom for iPad, a dynamic range RAW capture that was previously only possible when shooting with a DSLR or mirrorless camera is now available on latest iOS devices.
Additional improvements in this edition of Lightroom for iOS include 3D Touch support on iPhone 6s/7 series, a Notification Center widget, the ability to export your original images, including DNGs and RAW files, and more.