Ratter is a 2015 American found-footage horror thriller film written and directed by Branden Kramer in his feature debut.

Emma Taylor, a graduate student, moves to New York City for a fresh start after her recent break-up with her boyfriend Alex.

After settling into her new Brooklyn apartment, someone begins anonymously hacking all her electronic devices and watching her through the cameras.

She confronts Michael, who denies sending the messages, but Emma does not believe him and starts avoiding him.

She returns home drunk and passes out on her couch, unaware that her hacker is out on her balcony.

Feeling more vulnerable than ever, Emma spends the day wandering the city so she does not have to be home alone.

[4] The film was released on March 1, 2016, through video on demand and home media formats.