A: YouTube changed their internal code in October 2024. For Android 4.4.2, you need a client that uses the "Innertube" legacy API. NewPipe 0.21.13 still works as of this writing. If it breaks, switch to SkyTube (another open-source alternative for KitKat).
Note: Vanced is discontinued, but old APKs still work on KitKat.
Version: YouTube Vanced 14.21.54 (API 19 compatible)
Version: YouTube 14.13.55 (final KitKat-compatible release)
If you want background play, audio-only mode, and zero ads, NewPipe is objectively better than the official YouTube app on any device, especially Android 4.4.2.
Key Features:
Compatibility: NewPipe supports back to Android 4.4 (API 19). Download the .apk from their official archive (Look for NewPipe_v0.21.13 – the last version supporting KitKat).
Option 1: YouTube Go (Best Official Alternative - Discontinued but works)
Option 2: NewPipe (Best Open Source)
Option 3: Vanced MicroG + Old YouTube Vanced (Advanced)
Option 4: Pure Tuber (Third-Party)