CoverMaker is a small macOS that generates YouTube video thumbnails for my channel.
It takes YouTube metadata for a video (manually input) and display it in a SwiftUI view. It can hide everything else in the app except for the view, including Mac UI elements such as title bar and window shadow. In this mode a screenshot of the app is the thumbnail in the right dimention. The two modes can be toggled by double-click the content of the window.
The app is built with SwiftUI and Composable Architecture. It's mostly written from project creation to finish during a live stream, the archive of which can be viewed here.