This page explains what the app uses under the hood, what happens locally on your Mac, and why Gatekeeper may still ask for confirmation depending on your system and release state.
Star Video Downloader is a native macOS app written in SwiftUI. 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 depending on your machine, how the ZIP was downloaded, and whether an older cached copy is still present. The website always points to the latest GitHub release asset now, which reduces stale-download problems. 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.