It looks like "Beauty Killer 1.mkv.mp4" is a specific video file—likely a movie, tutorial, or music video—rather than a widely known commercial product or app. Because the filename contains double extensions ( .mkv.mp4 ), it often indicates a file that has been renamed or converted, common in personal collections or digital downloads.

There are various indie horror shorts or documentaries with "Beauty Killer" in the title (often referring to true crime cases or high-fashion satires).

Could you share a bit more about the (e.g., is it a movie, a music video, or a makeup tutorial)? That would help me find the specific review you need!