Photo extensions mean you no longer have to jump from image editing app to image editing apps, opening and saving as you go, hoping you never make a mistake because there's just no going back. Instead, you simply open Apple's built in Photos app, tap the photo extensions button, and all the filters and effects you've installed from the App Store instantly become available to you right where you are.
All you have to do is enabled them first. Oh, and find them. That's where this list comes in. If you're looking for the best iPhone apps for photo editing, here they are!