"The Doomsday Clock is a symbolic clock face, representing a countdown to possible global catastrophe (e.g. nuclear war or climate change). It has been maintained since 1947 by the members of the Science and Security Board of the Bulletin of the Atomic Scientists, who are in turn advised by the Governing Board and the Board of Sponsors, including 18 Nobel Laureates. The closer they set the Clock to midnight, the closer the scientists believe the world is to global disaster."
This app gives you an overview about the current and past state of the Doomsday Clock.
This app notify you when the time of the Doomsday Clock has changed. You can disable the notification in the settings of the app. To get notifications in the future it is necessary to start the app once after installing or after installing the latest update.
This is no official app.