Carousel is a program put out by Dropbox to help you organize and back up the photos you take with your iPhone, quickly and securely. This app will back up every photo you take as soon as you take it, and it provides a much more accessible way to view all of the photos you have in Dropbox right from your phone.
Nice navigation: All aspects of this app's interface are both functional and attractive. You can view your photos organized by date taken, tap to enlarge a single photo, and swipe back and forth to browse through enlarged versions of all of your photos. Additionally, you can swipe up on any photo to share it straight from the app. Swiping down, on the other hand, hides the photo from the main Carousel view.
Backup options: Under Settings, you can choose whether you want the app to upload your photos on both Wi-Fi and Cellular or Wi-Fi only. If you opt for the Wi-Fi-only option, the app will just upload all new photos once you're connected to Wi-Fi again, so you can still enjoy the benefits the app provides without burning through battery life and data to do it.
Can't stop sync: While the Wi-Fi-only option is nice, there's no way to completely turn off uploads. You also can't sign out of Carousel without also signing out of Dropbox on your device, and you can't select certain photos to upload without others. You can delete photos from your Dropbox account once they're uploaded, but it's a two-step process that involves hiding them first and then deleting them from the Hidden screen.
Carousel works well, and its intuitive interface provides a nice option for viewing stored photos, which is still pretty hard to come by these days. The fact that you can't stop uploads completely is somewhat of a drawback, and the app does seem to drain the iPhone's battery quickly, no matter how you're using it. You also don't get a whole lot of storage for free with Dropbox, and full-resolution photos like the ones the app uploads will fill that up quickly. You can upgrade, of course, to the Pro version of Carousel for $99.99 per year to get access to 100GB of storage, if you don't already have an upgraded Dropbox account.