This article describes how one science teacher based an activity on designing smartphone apps to clearly and concisely communicate the interdependent relationships of a biological ecosystem. The teacher designed the activity to address several aspects of the latest science standards. Students needed to understand their ecosystem and synthesize new information from their own research to deliver the content necessary to build their apps. The activity integrated various types of content knowledge, incorporating the engineering design process, using 21st-century skills, and giving students a different perspective on the apps they use every day.