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Civitas is an empire-building game engine written in Javascript with the help of the jQuery library.

Release dateApril 30, 2017
Downloadzip archive
Sourcegit clone https://github.com/sizeofcat/civitas.git


  • Over 50 types of buildings, each intertwined in the chain of production.
  • Custom climate zone, each with specific buildings.
  • Global market, player can trade goods with other settlements.
  • Army! Navy! Soldiers! Ships!
  • Fame system that allows your city to level up via trades, conquers and special buildings.
  • Prestige system that affects diplomacy.
  • Each city in the game world is linked via a influence system that needs to be maintained for diplomacy to work.
  • Random events that can change your diplomacy status with the other cities, give you coins or random resources.
  • Espionage, subvert cities, destroy buildings, sabotage.
  • Ranking screen, where cities get ranked according to their status in the world.
  • Declare war, propose alliances and pacts, ask other settlements to join your city, propose cease fire.


  • Server component, no actual data is saved externally, only in your browser’s localStorage.
  • Jailer component that assures game data integrity (no cheating).
  • Any player interaction since no data is transmitted to the server component.
  • Artificial Intelligence (AI) for computer-controlled cities.
  • And many others. Stay tuned though.


Choose an archive format from the Releases section, download and uncompress it. Point your browser to index.html, you don’t need a game server to play.



Civitas is written by sizeof(cat) and distributed under the MIT license.


Pull requests are always welcome!

I am always thrilled to receive pull requests, and do my best to process them as fast as possible. Not sure if that typo is worth a pull request? Do it! I will probably appreciate it.

If your pull request is not accepted on the first try, don’t be discouraged! If there’s a problem with the implementation, hopefully you received feedback on what to improve.

Always sign your commits and make sure you read the coding style.

Source code

Civitas is written using Javascript, has ~15000 lines of code, ~250Kb minified and can be downloaded from GitHub.com or by using git to clone the repository:

git clone git@github.com/sizeofcat/civitas.git



The music/track1.mp3 song is named ‘Glandula Pinealis’ by Shatifax.


Click here for a demo.