Cortana is available for Windows Phone 8.1, Windows 10, Windows 10 Mobile, Xbox One, Android, Invoke and iOS. On both Windows Phone versions, Windows 10, & Xbox One, the color of Cortana depends on your device color.
Notes: 1 Developed by 4J Studios. 2 Developed by Mojang. 3 Developed by Oracle. 4 Developed by SkyBox Labs. 5 Developed by Telltale Games. 6 Developed by Xbox Game Studios. 7 Collaboration with Gamepedia. 8YouTube-affiliated. 9 Collaboration with Lego.