The phrase in your topic—“Apk Full App V1 66.1 Neon Activator”—suggests an unofficial APK build plus a third‑party “activator” or patch (NEON likely referring to ARM NEON CPU builds). That combination is commonly distributed outside official channels as a paid‑app removal/crack or mod.
Neutron Music Player is a commercial, audiophile-focused music player for Android, iOS and Windows that uses a native 32/64‑bit audio engine and extensive DSP to deliver high‑resolution, bit‑perfect playback and advanced routing (USB DACs, UPnP/DLNA, Chromecast). The official vendor is Neutron Code Limited and current public releases (2025–2026) use versioning in the 2.x series; older/alternate builds included ARMv7/NEON variants.