Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for displaying a challenge question in a challenge user interface displayed on a mobile device, displaying an idea user interface in response to user selection of the challenge question from the challenge user interface, receiving an idea based on user input to the idea user interface, the idea addressing subject matter of the challenge question, and transmitting an idea data set digitally representing the idea to a back-end system, the back-end system hosting an idea generation platform.