色分けコンテキスト
仕事・副業・個人タブを閉じずに分離。ワンクリックで文脈切替。
Arc 移行ガイド · 2026年2月
Browsers with Workspaces Like Arc
Arc は「Spaces」を当たり前にした—色分けコンテキスト、縦サイドバー、タブ混乱ゼロ。2026年もその DNA を持つブラウザを比較。Arc で恋しい機能で絞り込み、Tabbit の AI 実行を確認。
Arc で恋しいもの
Arc Spaces が本当にくれたもの
多くの記事が省略。Arc ユーザーが欲しいのは3つの習慣。
縦タブ棚
フルタイトル、ドラッグ並べ替え、URL バーを邪魔しないサイドバー。
プロファイル分離
Space ごとにログインと拡張を分離。
2026 Arc 風ブラウザ
Seven names people actually compare when searching “browsers with workspaces like Arc.” Filter above to narrow the wall.
Tabbit
AI smart groups + vertical tabs
Windows & macOS · free
Closest upgrade path: Arc-style grouping plus Agent Mode that runs tasks in parallel tab groups while you keep browsing.
AI groupingAgent modeChrome importAI + ワークスペース縦サイドバーSpaces / コンテキスト
Z
Zen Browser
Firefox workspaces + sidebar
Windows, macOS & Linux
Community favorite after Arc—Firefox-based with Workspaces, vertical tabs, and a calm default theme. No built-in AI agent.
Open sourceWorkspacesVertical tabs縦サイドバープロファイルSpaces / コンテキスト
S
SigmaOS
Mac “islands” like Spaces
macOS-first
Spatial layout with workspace islands and AI sidebar. Feels Arc-adjacent but Mac-only and account-gated for sync.
Mac onlyIslandsAI sidebarSpaces / コンテキスト縦サイドバー
V
Vivaldi
Named workspaces + stacks
Windows, macOS & Linux
Power-user classic—native Workspaces, tab stacks, and deep customization. Steeper learning curve than Arc was.
WorkspacesTab stacksCross-platformSpaces / コンテキストプロファイル縦サイドバー
F
Floorp
Firefox workspaces clone
Windows, macOS & Linux
Reddit’s frequent answer—Firefox fork with Workspaces, vertical tabs, and tree-style tabs. Great if you want Gecko + Arc vibes.
Firefox forkWorkspacesTree tabsSpaces / コンテキストプロファイル縦サイドバー
D
Dia
AI-first from Browser Company
macOS · invite/waitlist
Successor energy from Arc’s makers—conversation-first UI with shared contexts. Limited platform reach vs Tabbit today.
AI-nativeBrowser CompanymacOSAI + ワークスペース縦サイドバーSpaces / コンテキスト
A
Arc (legacy)
Original Spaces reference
macOS · winding down
The benchmark everyone compares against—Spaces, Little Arc, and Boosts. Not a forward-looking pick in 2026.
Spaces originLegacymacOS onlySpaces / コンテキスト縦サイドバープロファイル
Arc 風シグナル比較
Quick scan before you reinstall another sidebar. Green checks are “good enough for most Arc migrants.”
| Browser | Space-like contexts | Vertical tabs | Win + Mac | AI grouping | Free tier |
|---|---|---|---|---|---|
 Tabbit | Smart groups | Yes | Yes | Built-in | Full free |
| Zen Browser | Workspaces | Yes | Yes + Linux | No | Free OSS |
| SigmaOS | Islands | Yes | Mac only | Sidebar AI | Freemium |
| Vivaldi | Workspaces | Optional | Yes + Linux | No | Free |
| Floorp | Workspaces | Yes | Yes + Linux | No | Free OSS |
| Dia | Shared chats | Partial | Mac only | Core UX | Waitlist |
| Arc (legacy) | Spaces | Yes | Mac only | Max (paid) | Sunsetting |
Spaces から実行へ
Tabbit が Arc のアップグレードである理由
縦タブとスマートグループに Agent モードを追加—調査や入力を並列タブグループで実行。
AI スマートグループ
20タブを Arc Spaces のようにトピック別にクラスタリング。
独立タブグループの Agent
現在の Space を占有せずタスクを委譲。
移行摩擦ゼロ
Chrome/Arc から数分でインポート—招待コード不要。
Windows/Mac 無料
トップモデル込み、ワークスペースに paywall なし。
Arc ワークスペース FAQ
Arc 移行者の質問
Which browser is most like Arc Spaces?+
Zen Browser and Floorp mirror Arc’s workspace + vertical sidebar combo on Firefox. Tabbit matches the organization feel and adds AI smart groups plus Agent Mode on Chromium—for both Windows and macOS.
Is Zen Browser a good Arc replacement?+
Yes for layout purists—Workspaces, vertical tabs, and open-source development. It lacks Arc’s polish and any native AI agent; pair it with extensions or switch to Tabbit if you want execution, not just grouping.
Does SigmaOS work like Arc on Windows?+
No—SigmaOS is macOS-first. Windows users should look at Tabbit, Vivaldi, Floorp, or Zen instead.
Can Tabbit import my Arc profile?+
Tabbit imports from Chrome, Edge, and Safari—including bookmarks, passwords, history, and extensions. Export Arc to Chrome first, then one-click import into Tabbit.
Are browsers with workspaces like Arc free?+
Zen, Floorp, and Vivaldi are free. Tabbit is free without invite codes. SigmaOS and Dia offer freemium or waitlist tiers.
What happened to Arc Browser?+
The Browser Company shifted focus; Arc is in wind-down for new users. That’s why “browsers with workspaces like Arc” spiked—people want Spaces elsewhere.
Do I need vertical tabs for Arc-like workspaces?+
Not strictly—Vivaldi uses horizontal tabs with workspaces. Most Arc fans expect a sidebar though; Tabbit, Zen, and Floorp all ship vertical tab layouts.
Is Dia the official Arc successor?+
Dia comes from the same company but targets AI conversation workflows, not a 1:1 Spaces clone. For cross-platform Arc-style workspaces today, Tabbit is the stronger default.
Tabbit で Arc 棚を再構築
無料 · Windows/macOS · AI グループ & Agent 込み