500px摄影社区 is a free multimedia application available for iPhone users. It is one of the largest creative photography communities in China that allows users to share photos, videos, and exchange shooting techniques and experiences with other photographers. The app aims to help photographers sell their work and establish their brand.

The app provides an opportunity for photographers to have their work featured on millions of mobile screens as lock screen photos, and also allows them to sell their work through the app's image library. The app attracts photographers and enthusiasts from all over the world, and users can join different tribes and interest groups to share their work and participate in various online and offline activities. The app also features regular photography competitions, creation activities, and topic discussions. It allows users to create their own personal photography profile to showcase their work, and provides a space for video creation to capture and share their moments. The app covers 28 different photography themes, including landscape, portrait, city, and documentary, and offers learning resources and tutorials to help users improve their photography skills.

Overall, 500px摄影社区 is an excellent multimedia application for photography enthusiasts that provides various opportunities for them to showcase their work and interact with a global community of photographers.