What was the movie Countdown about?

Countdown is a horror movie where a mysterious app predicts the exact moment of a user's death. It follows a young nurse named Quinn who downloads the app and discovers that she only has three days left to live. As she tries to find a way to cheat death, she uncovers a sinister connection between the app and a series of unexplained deaths. She must race against time to unravel the mystery before her time runs out.