Show HN: Arcmark – macOS bookmark manager that attaches to browser as sidebar

Source: Hacker News

Overview

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 – a macOS bookmark manager (Swift/AppKit) that floats as a sidebar attached to any browser window. It uses the macOS accessibility API to follow the browser window around and replicates Arc’s sidebar UX as closely as possible.

Features

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 regular bookmark manager window.
3. Arc import – Parses Arc’s StorableSidebar.json to recreate the exact workspace/folder structure, including pinned tabs and spaces.
4. Workspace‑based organization – Nested folders, drag‑and‑drop reordering, and custom workspace colors.
5. Built with swift‑bundler – No Xcode project required.

Installation

• Download the DMG from the releases page (macOS 13+).
• Build from source if you prefer: the project uses swift-bundler for dependency management.

Demo

A demo video is included in the repository’s README, showing the sidebar attachment in action.

Feedback

This is v0.1.0, an early version. I would appreciate any feedback or thoughts.

Links

• GitHub repository:
• Hacker News discussion: