"Unfriended: Dark Web" is generally considered a psychological horror-thriller that taps into fears related to technology and online privacy. The film is suspenseful, with a tense atmosphere and moments of jump scares, focusing on the dark side of the internet. It effectively builds anxiety through its real-time storytelling and the sense of helplessness experienced by the characters. While opinions on its scare factor vary, viewers who enjoy horror films that explore contemporary issues may find it particularly chilling.

"Unfriended" and "Unfriended: Dark Web" are not directly connected in terms of plot or characters, as they feature different stories and casts. However, both films belong to the same franchise and share a similar format, utilizing the screen-life style of storytelling where the narrative unfolds through computer screens and digital interactions. While the first film focuses on a group of friends haunted by a supernatural entity, the sequel explores themes of the dark web and online anonymity, making it more of a thematic continuation rather than a direct sequel.

The preference between "Unfriended" and "Unfriended: Dark Web" often depends on individual tastes. The original "Unfriended" (2014) is notable for its unique format and psychological horror, focusing on a group of friends haunted by a mysterious online presence related to a past tragedy. "Unfriended: Dark Web" (2018) shifts to a darker theme involving the dangers of the dark web, featuring more intense and disturbing scenarios. Critics generally favor the original for its originality, while some appreciate the sequel's more thriller-oriented approach.

In "Unfriended: Dark Web," the killer is revealed to be a character known as "The Dark Web Killer." The film centers on a group of friends who unwittingly stumble upon a laptop that contains disturbing content linked to a dark web organization. As they interact with the laptop, they become targets of this mysterious and dangerous killer who will stop at nothing to protect their secrets. The tension escalates as the friends are hunted down one by one, leading to a suspenseful climax.