Adobe, creator of the world's best photo editing suite Photoshop, has released a mobile app of its Lightroom software which has only been available to desktop users till now. The app is currently available on iTunes for iPad only and will soon be released for iPhone also. The new app will automatically syncs with Lightroom 5 on the desktop as well.
In order to fully utilize all the features of the app, you will need to have a Creative Cloud subscription (which is primarily the catch here).