Snapr is a mobile application for sharing geo-tagged images. Its goal is to create a "live map of the world's photos." It also has an API that enables developers to add location information and Instagram-like social photo feeds to your own mobile photo apps. You can also use Snapr's API to give users the ability to send photos to multiple services from one application.
The API is core to Snapr's strategy. Snapr is more focused being the ecosystem than competing directly with services like Instagram. According to the company's blog post about the API: "In fact we love our API so much that it has more functionality than our currently available app and website!"