What was the name of Sherlock's official mobile app launched in 2014?

Sherlock’s official mobile app launched in 2014 was called Sherlock: The Network.

The app was released alongside the show’s third series and was developed by The Project Factory in association with Hartswood Films. Rather than simply offering episode information, it functioned as an interactive mystery experience: players joined Sherlock’s “Network” and helped investigate cases through puzzles, location-based exploration and story material connected to the television series.

The app included exclusive audio and video featuring members of the cast, including Benedict Cumberbatch and Martin Freeman. Promotional material described more than 30 minutes of new video content, games and a mystery for players to solve. It initially appeared for iPhone and iPad, with an Android release following later in 2014.

The title is easy to confuse with fictional concepts from the show, such as Sherlock’s mind palace. “The Network” instead refers to the homeless network Sherlock uses for information gathering, which the app turned into the player’s entry point for solving new cases.