安川 要平

Whistle on Android is an Android app that helps you survive from disasters. When you run it, it starts ringing such loud whistle sounds that people around there can notice where you are. So, for example, if you can't escape from a collapsed building and have to wait for a rescue, it will help saying SOS signal instead of you. The app has been downloaded by 150,000+ people, and is selected as one of the best apps you need for emergency by many media in Japan.