Arcmark – macOS bookmark manager that attaches to browser as sidebar
Hey HN! I was a long-time Arc browser user and loved how its sidebar organized tabs and bookmarks into workspaces. I wanted to switch to other browsers without losing that workflow. So I built Arcmark, it's a macOS bookmark manager (Swift/AppKit) that floats as a sidebar attached to any browser window. It uses macOS accessibility API to follow the browser window around. You get workspace-based links/bookmarks organization with nested folders, drag-and-drop reordering, and custom workspace colors. For the most part I tried replicating Arc's sidebar UX as close as possible. 1.…
In plain words
Arcmark is a macOS bookmark manager that replicates Arc browser's sidebar workflow for use with any browser. It floats as a sidebar attached to browser windows, organizing bookmarks into workspaces with nested folders, drag-and-drop reordering, and custom colors. Built with Swift and AppKit, it uses macOS accessibility APIs to follow the browser window. All data is stored locally in a single JSON file with no accounts or cloud sync required. Users can import existing pinned tabs and work with Chrome, Safari, Brave, Arc, or use it standalone.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey HN! I was a long-time Arc browser user and loved how its sidebar organized tabs and bookmarks into workspaces. I wanted to switch to other browsers without losing that workflow. So I built Arcmark, it's a macOS bookmark manager (Swift/AppKit) that floats as a sidebar attached to any browser window. It uses macOS accessibility API to follow the browser window around. You get workspace-based links/bookmarks organization with nested folders, drag-and-drop reordering, and custom workspace colors. For the most part I tried replicating Arc's sidebar UX as close as possible. 1. Local-first: all data lives in a single JSON file ( ~/Library/Application Support/Arcmark/data.json). No accounts, no cloud sync. 2. Works with any browser: Chrome, Safari, Brave, Arc, etc. Or use it standalone as a bookmark manager with a regular window. 3. Import pinned tab and spaces from Arc: it parses Arc's StorableSidebar.json to recreate the exact workspace/folder structure. 4. Built with swift-bundler rather than Xcode. There's a demo video in the README showing the sidebar attachment in action. The DMG is available on the releases page (macOS 13+), or you can build from source. This is v0.1.0 so it's a very early version. Would appreciate any feedback or thoughts GitHub: https://github.com/Geek-1001/arcmark
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