The photo and video mobile app market is not only booming, it’s also changing rapidly. A new study from 6Sight found that of 475 top ranking photo and video apps, 46 percent were less than six months old and 20 percent were introduced in the last 90 days. Photo or video apps priced at the minimum store level of $0.99 are more common among top ranking apps introduced in the last 180 days than among older apps.