Countdown

At a lively party with her friends, teenager Courtney is convinced to download a mysterious app called Countdown. The app is said to predict how much time a user has left to live, and Courtney is shocked when it reveals she has only three hours remaining.

After realizing her countdown is ticking down fast, Courtney avoids getting into a car with her drunk boyfriend, Evan. However, she receives a notification from the app indicating she has violated the user agreement, intensifying her fear.

Tragically, upon returning home, Courtney is attacked by an unseen force as her countdown hits zero. The chilling nature of her death emphasizes the app's power and horror.

Meanwhile, Evan suffers a catastrophic accident when a tree branch crashes through his seat, an act of fate that mirrors Courtney's previous choices. This incident underscores the peril lurking in their lives due to the app.

Quinn Harris, a nurse at the hospital where Evan is treated, learns about the app from him. Initially dismissive, she is soon compelled to download Countdown herself, only to discover she has three days left to live.

Evan decides to skip his necessary surgery, unwittingly breaking the app's user agreement. This choice leads to a horrifying encounter with a demonic version of Courtney, resulting in Evan's death.

After Evan's death, Quinn visits her younger sister, Jordan, at home. Their relationship is strained as they navigate the aftermath of their mother’s passing, adding emotional layers to their struggles together.

Learning about Evan's death, Quinn's desperation grows as she quickly snatches up Evan's phone, seeking information. A new shocking notification alerts her that she has also broken the user agreement.

As she navigates the challenges with her boss Dr. Sullivan, Quinn becomes increasingly fearful about the Countdown app. She begins to investigate, discovering Courtney's fate and other similar experiences, igniting her resolve for answers.

The following day, Jordan finds Quinn and delivers horrifying news that the app indicates Quinn has only one day left to live. Faced with the urgency of escape, Quinn attempts to buy a new phone.

Quinn meets Matt, whose app predicts his death just hours before her own countdown expires. They ally to uncover a way to break free from the app's curse, forging a bond in their shared terror.

Together with Father John, they learn crucial information about the app's coding that may hold the key to their survival. However, Quinn's reputation is threatened when Sullivan falsely accuses her of harassment.

In the ultimate act of desperation, Quinn overdoses, trying to take down the demon Ozhin. In a twist of fate, her sister Jordan manages to revive her, showcasing the depth of their bond amid chaos.

Quinn and her sister visit their mother's grave, reflecting on their journey and losses. This moment underscores their emotional growth and perseverance through terror.

Just when the sisters think they are safe, Quinn discovers her phone has updated to Countdown 2.0, hinting that the horror may not yet be over. This ominous turn leaves an unsettling feeling of dread lingering.