IMAGGA

Imagga is an Image Recognition PaaS providing Image Tagging APIs for developers & businesses to build scalable, image intensive apps in the cloud. Image understanding technologies are wrapped in a cloud platform of powerful APIs that allow auto-cropping, color extraction & search, categorization and auto-tagging (keyword annotation) of large image collections. They've designed an infrastructure that can handle huge loads of images and auto-scale to accommodate a lot of concurrent queries. Currently they offer their APIs on a software-as-a-service pay-as-you-go basis both for web and mobile.