2024-12-17 00:00:00 Your countdown is waiting. Based on the horror movie Countdown, this app will predict exactly how long is left. Tag us in your reactions using #CountdownApp on Tiktok. In COUNTDOWN, when a young nurse (Elizabeth Lail) downloads an app that claims to predict exactly when a person is going to die, it tells her she only has three days to live. With time ticking away and death closing in, she must find a way to save her life before time runs out.