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macOS bookmark manager that attaches to any browser window as a sidebar

475 starsSwift

Arcmark – macOS bookmark manager that attaches to browser as sidebar

by ahmed_sulajman·Feb 14, 2026·94 points·21 comments
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AI Analysis

●●SolidNiche GemSolve My Problem

Arc's sidebar, but for any browser—local-first, no signup required.

Strengths
  • •Browser-agnostic sidebar attachment via macOS accessibility API is a genuine technical win.
  • •Arc importer means zero friction for existing users switching browsers.
  • •Local JSON storage, no accounts, full offline-first philosophy with nested workspaces and drag-drop.
Weaknesses
  • •macOS-only limits audience; no Windows or Linux alternative exists in the space.
  • •Early stage (v0.1.0) with limited feature parity to Arc (no sync, no cloud backup, team features).
Category
Productivity
Target Audience

macOS users who want Arc browser's sidebar organization across Chrome, Safari, Brave, or other browsers

Similar To

Arc browser · Raindrop.io · Notion Bookmarks

Post Description

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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