Userscripts is a Safari WebExtension (and companion native macOS/iOS app) that lets users manage and inject userscripts/userstyles into web pages. It provides a popup for toggling scripts and checking updates, a full-featured code editor (CodeMirror 5) for editing scripts, and native apps that store scripts in a local filesystem directory. The extension communicates with the native app via Safari's native messaging, and supports all major Greasemonkey API methods, match patterns, and metadata blocks. The project uses Svelte+Vite for all UI surfaces, Swift for native platforms, and Xcode project with Fastlane for deployment. It is a polished, well-architected tool that fills a gap left by Safari's limited extension ecosystem.