However, you are probably referring to (often called SmartTubeNext ), the popular third-party YouTube client for Android/Google TV, Amazon Firestick, and other devices. The numbers might be a version code (e.g., beta 617 , stable 740 , or an update notification).
The creator of Smart YouTube TV abandoned the project to build a much more advanced, modern replacement. : SmartTube (formerly SmartTubeNext). smart youtube tv 617 740 upd
: Reliable archives for older versions include APKMirror and Aptoide . SmartTube However, you are probably referring to (often