Window Sweaters is a macOS utility designed to provide a 'cosier' desktop experience by dressing application windows in knitted borders. The application operates as a menu-bar tool, allowing users to customize the appearance of their workspace with yarn-inspired patterns and colors. It offers two primary modes: 'By App,' which provides custom-tailored sweaters for 37 specific applications (including popular tools like Slack, VS Code, and Notion), and 'Zigzag,' which automatically generates a matching cream zigzag border based on the colors found in an application's icon.
This image illustrates the two primary modes of the application: 'By App' and 'Zigzag' styles.
Users can fine-tune the visual experience by adjusting the border width, stitch size, and specific patterns through a yarn icon in the menu bar. The app also provides granular control over which windows are affected; users can choose to 'Turn Off for All Apps' or selectively untick specific applications to leave them 'bare.' While the app handles many popular tools with hand-picked colorways, it also dynamically samples colors from icons in the background to ensure that even less common apps receive a consistent aesthetic. If an icon lacks usable colors, the app defaults to a stable color based on the application's name.
This visual demonstrates the core functionality of dressing application windows in knitted borders.
Because the application relies on private macOS window APIs to track which window is currently focused, it requires the user to grant it Accessibility permissions in the system settings. The software is compatible with macOS 13 or later on both Intel and Apple Silicon architectures. However, there are notable technical trade-offs: the app is not yet notarized by Apple, requiring users to manually bypass security prompts to launch it, and its reliance on private APIs means that system updates could potentially break its functionality. Additionally, the developer notes that the knitted borders may temporarily hide while a window is being resized before reappearing once the action is complete.
While the project has gained attention for its unique aesthetic, the documentation currently relies on synthetic images of windows in a void rather than real-world screenshots of active desktops. Furthermore, because the app is hosted on a new GitHub repository and is not notarized, some users have expressed caution regarding the security implications of running such software. For those interested in the technical side, the project is open-source under the GPL-3.0 license and includes a build script for users who prefer to compile the application locally using Python 3 and Apple's Command Line Tools.