“In a world where mass shootings are startlingly normal and progress toward reasonable action feels enragingly slow, one organization and its nearly six million supporters offer a glimmer of hope. Founded in 2012—one day after Sandy Hook—Moms Demand Action has become the largest grassroots movement working to end gun violence in America. We built both a website and a set of apps for Moms Demand Action. The website helps new volunteers sign up and get started while the app keeps them engaged over time. In both cases, joining the movement needed to be effortless, and taking action needed to feel immediate.”