Arcmark is a native macOS bookmark manager designed to attach to any browser window as a sidebar, providing a workspace-based organizational system for bookmarks. It is heavily inspired by Arc Browser's sidebar approach and focuses on keeping bookmarks accessible and organized directly within the browsing environment.

The application features workspace organization with custom-colored workspaces for separate bookmark collections, nested folders with drag-and-drop support for hierarchical structures, and inline editing capabilities for renaming folders and links directly in the list. It includes search and filter functions to quickly find bookmarks across workspaces, automatically fetches website icons and page titles, and supports importing bookmarks from Chrome or Arc browser. Additionally, it offers an always-on-top mode to pin the window above other applications.

Arcmark operates as a local-first application, storing all data in a single JSON file on the user's Mac. This ensures privacy and control over bookmark data without relying on cloud services.

The benefits include improved bookmark management efficiency, reduced clutter in browser bookmark bars, and enhanced productivity by keeping bookmarks visible and organized alongside browsing activities. Use cases involve organizing research materials, managing frequently visited websites, and maintaining project-specific bookmark collections.

The target users are macOS users who need efficient bookmark management across multiple browsers. It integrates with browsers like Chrome, Arc, Safari, and Brave, and is built using Swift and AppKit technologies.