This page explains what the app uses under the hood, what happens locally on your Mac or Windows PC, and why Gatekeeper or SmartScreen may still ask for confirmation depending on your system and release state.
Star Video Downloader is a desktop app for macOS and Windows PC. It uses yt-dlp for site extraction and ffmpeg / ffprobe for conversion, verification, and repair tasks.
macOS may still show an Open Anyway or quarantine warning, and Windows may show a SmartScreen warning while the PC build is new. Only continue when the ZIP came from starvideoapp.com or the linked GitHub release. If you hit trouble, see the help page.
If you want to verify what the app is seeing, export the support bundle from Settings and send it to support@starvideoapp.com.