Our official installation guide shows the app to use on each device, with every step.
Any app with an Xtream Codes login works with your subscription, for example IPTV Smarters, TiviMate or IBO Player. Some apps play more smoothly on some devices than others: if the picture isn't smooth in one app, try another one from the guide.
Player apps are separate from your subscription. If an app asks you to pay for its own upgrade, that is the app's license, not IPTVV.