Fitbit is challenging developers to build apps using their SDK or API to help individuals better manage conditions like diabetes, heart health, sleep, and mental health. The challenge offers a $10,000 prize to be split amongst the winning team. Fitbit's developer platform includes a standards-based SDK with JavaScript, SVG, and CSS as well as simulator tools. It also provides RESTful APIs for accessing activity, biometric, and other user data to power health and fitness apps.