Call of Duty is described as 'First-person and third-person shooter series by Infinity Ward. The earlier games in the series are set primarily in World War II; later games have been set in modern times, beginning with Modern Warfare' and is a popular first-person shooter in the games category. There are more than 50 games similar to Call of Duty for a variety of platforms, including Windows, Steam, Linux, Mac and Android apps. The best Call of Duty alternative is Counter-Strike, which is free. Other Call of Duty like games are Unreal Tournament, Battlefield, Splitgate and The Finals.
Insurgency is a slow-paced hardcore shooter and therefore its gameplay isn't comparable to Call of Duty's more frantic casual experience, but it does have quite a satisfying level of flexibility regarding loadout customization.