Having tested all four on current iOS devices:\n\n**GSE Smart IPTV**: The most feature-complete iOS IPTV app. Excellent EPG grid view, reliable performance, M3U and Xtream compatible, supports external players. Best overall for daily use in my experience.\n\n**IPTV Smarters Pro**: Good interface, reliable, cross-platform if you also use Android. EPG is decent but the grid view is less refined than GSE. Very popular across both platforms.\n\n**IBO Player**: Excellent on Apple TV specifically (see below). iOS version is functional. Cleaner interface than Smarters but fewer settings to customise.\n\n**Flix IPTV**: The most polished interface of the four. Designed specifically for Apple ecosystem. Best on Apple TV but also works well on iPhone and iPad.