According to the official game description:
The game was initially available as an alpha version on September 25, 2012 with continuous updates. Then it was officially released on PC last year, October 6th. Its unique concept gained attention from many gamers, and garnered over 1.25 million sales. With its success, it is also getting released on other platforms for more players to enjoy this award-winning game!
Prison Architect will be released on PS4 and Xbox One today.