Client Applications covers everything the viewer touches: 11 articles on the OTT client landscape (web/mobile/CTV/STB), HTML5 web player, iOS/Android engineering, smart-TV apps (Roku, tvOS, Tizen/webOS), SDK vs custom build, watch-UX, in-app subscriptions, cast (Chromecast/AirPlay), offline playback, app analytics, and a unified player abstraction.