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Created by the Blume Corporation, the CTOS, or Central Operating System, controls Chicago during the events of Watch Dogs. CTOS 2.0 replaces it during the events of Watch Dogs 2 in San Francisco.


CtOS Map

An introduction to what the CTOS controls

The CTOS is the fundamental weakness of the city, as it can be hacked into through the use of a chain of backdoor programs and used as a weapon against the city and its inhabitants, and also through a malfunction in the facial recognition system, as stated by Aiden Pearce. The CTOS also stores information on each inhabitant of the city in control centers and gathers new information with the help of surveillance. Various control centers (data servers) are dotted around Chicago, which can be taken control of, along with CTOS towers, allowing Aiden Pearce to access the information it stores and the mechanisms it controls. Various communication sites are placed between the centers, allowing for quick transfer of data over large distances. Though CTOS has reduced and is still reducing the overall crime levels of Chicago, that doesn't mean that the city is as protected as Blume says it is. CTOS is tied to a satellite, which acts as a safety valve which can shut down the entire system if necessary.


One question that is frequently asked about the CTOS is: Who controls the system that controls Chicago? One negative that has been noted about the CTOS is that large businesses could use the data stored by CTOS to maximize profits. It has also been noted that control of the system could fall into the wrong hands, like those of hackers such as Damien Brenks, T-Bone, Aiden Pearce and Defalt.

The fact that control of CTOS could fall into the wrong hands has clearly been brought to the public's attention by a hacking collective known as DedSec. The group hacks into the system and misappropriated its abilities to use it for its own purposes, such as invasions of privacy or data collection, simultaneously emphasizing the enormous power and security flaws of CTOS.

Systems controlled by the CTOS



  • CTOS was upgraded to CTOS 2.0 with assumed upgraded security features after Aiden Pearce rebooted it. CTOS 2.0 was then installed in several other cities, including San Francisco and Oakland.
  • Taking the fact that Assassin's Creed and Watch Dogs are (probably) in the same universe, CTOS might be controlled by the Templars, the powerful group of people who control the world in the Assassin's Creed series.
    • The CTOS is mentioned in an Easter Egg in Assassin's Creed IV: Black Flag.
  • Despite being named "Central Operating System" in the game, in the ebook Watch Dogs //n/Dark_Clouds by John Shirley, it is referred to as the "City Operating System".
  • It is actually pretty rare to see CTOS vehicles after you completed all the district access missions.
  • CTOS is the main antagonist of the Alone Digital Trip, where it takes over the city with an army of robots in a twisted form of martial law.
  • In Watch Dogs 2, the Profiler has been redone to look more visually pleasing, including an emoji to reflect the NPC's general mood. Vehicles also have their own UI box which states: company name, logo, car make & model, car category, and also its license plate number.
  • While the Chicago Police extensively relied more on CTOS scan, San Francisco Police relies more on 911 calls and rarely seem to use CTOS scans.

See also

Start a Discussion Discussions about CtOS

  • CtOS 2.0 speculations

    23 messages
    • One thing I would love to see in ctOS 2.0 is either a tie in with TuneIN radio (highly unlickly) or a music player ap that could be linked to y...
  • Ctos kigan

    4 messages
    • thing is once you complete ctos missions any ctos vechicles are quite rare
    • Yeah. The only vehicles that spawn after that are the vans, and they spawn outside the Wards Control Center and Blume HQ.