The APK file size is roughly 20MB—much smaller than the official YouTube app. It also consumes significantly less RAM, reducing lag on low-end Firesticks or generic Android TV boxes.
If your device runs Android 5.0 or higher, you should install SmartTube Next. But if you have an old Android TV box (Android 4.4), a first-gen Firestick, or a cheap projector running an older OS, 6.14.18 is your best bet . Smart Youtube 6.14.18 Apk
If your device runs Android TV 10 or newer, skip this version and install the modern SmartTubeNext (STN) . The newer app is faster, safer, and has SponsorBlock, which is a game-changer for YouTube on a big screen. The APK file size is roughly 20MB—much smaller