My team did design an app one year, it was about educating and warning people about dangerous weather. It was never actually completed but at the time we went to tournament, they were having conversations and had submitted a proposal to someone at Google.
They had drawings and an explanation of how it would work, as well as copies of some of the communication. It was well received by judges.
Betsy T Wilco
Gifted Resource Teacher
Prince William County Schools
703.754.9061