Arc Browser Alternative 2026: The Complete Guide to Leaving Arc

By Kshetez Vinayak, founder of SupaSidebar. Last updated November 1, 2026.

TL;DR

Arc Browser stops working on December 22, 2026, and every Arc account is deactivated that day, per The Browser Company's Arc Sunset FAQ. It had been in maintenance mode since May 2025, after Atlassian acquired The Browser Company for $610 million (announced September 4, 2025, closed October 21, 2025). The Browser Company now builds Dia, a separate AI-first browser that does not replicate Arc's sidebar workflow. The best Arc Browser alternative depends on what you valued most: SupaSidebar recreates Arc's sidebar, Spaces, Command Bar, and Air Traffic Control across 25+ browsers including Safari, Chrome, Firefox, Arc, Zen, Vivaldi, Brave, Helium, and Dia without forcing a browser switch, and is the only tool that brings Arc's Spaces, folders, and pinned tabs into the browser you already use, in 3 clicks. Zen Browser is the closest full-browser Arc clone (Firefox-based, free, open source), and since Zen 1.24b it imports Arc's Spaces and pinned tabs too. Brave gives you vertical tabs with Chrome extensions. Among full-browser alternatives, none replicate Arc's sidebar, Spaces, Command Bar, and ATC together - this guide covers the trade-offs.

Quick navigation:

• Wondering what Arc's December 22 shutdown means for your data? → Is Arc Browser Dead?
• Already decided, ready to migrate? → Switching from Arc Browser
• Comparing every alternative? → You're in the right place. Keep reading.

Is Arc Browser Dead in 2026?

Yes, on a set date. On October 22, 2026, The Browser Company announced that Arc stops working on macOS and Windows on December 22, 2026, and that every Arc account is deactivated that day (Arc Sunset FAQ). New Arc accounts are already closed. Before that, Arc had been in maintenance mode since May 27, 2025, and Atlassian acquired The Browser Company for $610 million in October 2025, with the team now working on Dia, an AI-first browser.

If you are asking "should I leave Arc?" - yes, and before December 22. Start now while Arc still opens, so you can test alternatives side by side instead of moving in a rush in the last week.

For the full shutdown timeline, what happens to your Arc data, and whether Arc is still safe to use until then, see Is Arc Browser Dead? - the canonical status reference.

Why Replacing Arc Is Hard

Arc's sidebar, Spaces, and command bar created a workflow that most browsers don't even attempt to replicate. Now that Arc has a shutdown date and The Browser Company has shifted to Dia, over a million users need to figure out what comes next - without losing the workflow they spent months building.

This guide covers every realistic option: full browser replacements, sidebar-only tools, and the hybrid approach that lets you keep Arc's best feature in any browser you want.

What You're Actually Losing When You Leave Arc

Before comparing alternatives, it helps to name exactly what made Arc different. Most "Arc alternative" articles list browsers with tabs. That misses the point. Arc users built workflows around four core features and a handful of famous extras. Here is the full picture.

The four core Arc features

1. The Sidebar

Vertical tabs are table stakes at this point. What made Arc's sidebar different was persistence - pinned tabs, folders, and favorites lived in a permanent sidebar that did not disappear when you closed a window. Your sidebar was your workspace, not just a tab list.

2. Spaces

Spaces let you create separate contexts - Work, Personal, a specific project - each with its own pinned tabs, folders, and color scheme. You could switch between a "Research" Space and a "Social Media" Space without losing context in either. Tab groups in other browsers are not the same.

3. The Command Bar (Cmd+T)

Arc's command bar was not just an address bar. It searched bookmarks, tabs, history, and actions in a single interface. Power users lived in it - opening a tab, finding a bookmark, jumping to a Space, all from one keystroke.

4. Air Traffic Control (ATC)

This is the one Arc power users always bring up. ATC let you write rules like "any link from notion.so opens in my Work Space" and Arc would automatically route the link there. For anyone managing multiple contexts on the same machine, ATC turned the browser into a workflow engine.

The famous Arc extras (the ones people mention by name)

Beyond the four core features, Arc built a small set of named features that became part of its identity. When Arc users describe what they will miss, these are the names that come up:

• Little Arc - a tiny floating browser window that pops up for quick links without disrupting your main window. Click a link from another app, get a Little Arc, close it, done.
• Tab switcher - Ctrl+Tab jumped back to your last tab, and holding Ctrl showed a visual switcher of your most recent tabs, like the macOS app switcher.
• Split View - up to 4 tabs side-by-side in one window. Researchers, writers, and developers loved this.
• Boosts - per-site CSS injection. Hide YouTube comments, change Twitter's font, dark-mode a stubborn site. Permanent, per-domain.
• Easels - shared visual whiteboard / workspace pages. Mood boards, link collections, lightweight Notion-style notes inside Arc.
• Auto-archiving tabs - the "tabs auto-archive after 12 hours" rule that quietly cleared old tabs without losing them. Many users say this was the single feature that made tab anxiety go away.
• Arc Search on iOS - the mobile companion that turned a Google search into a generated answer page.

How SupaSidebar covers these features

This is where the "Arc replacement" conversation usually gets vague. The honest mapping:

Full descriptions of Command Panel, ATC, Window Tiling, SupaView, Tab Switcher and Archived Tabs are in the What SupaSidebar Replicates from Arc section below.

The takeaway: of the eleven "famous Arc features," SupaSidebar replicates or has a workable equivalent for eight, has a stronger version of two (Command Panel, ATC), and genuinely cannot replace three (Boosts, Easels, Arc Search on iOS). If Boosts was your favorite Arc feature, there is now one full-browser path that recovers them: Zen Browser shipped a native Boosts feature in v1.20b (May 2026) that customizes any site's look, fonts, colors, and dark mode at the engine level. On any other browser, your closest approximation is still a userstyle extension like Stylus - SupaSidebar can't inject CSS itself because it isn't a browser.

For everything else, SupaSidebar plus your browser of choice is a feature upgrade for Arc power users, not a downgrade. ATC alone - now with browser and profile routing - is worth the switch for anyone juggling work and personal contexts.

The Two Approaches to Replacing Arc

Arc alternatives fall into two categories, and understanding this split saves you hours of trying browsers that won't work for you.

Approach 1: Switch to a Different Browser

Replace Arc entirely with another browser. You get a complete package but you're locked into one browser again - and if it goes the way of Arc, you start over.

Approach 2: Add Arc's Sidebar Features to Your Existing Browser

Keep using Safari, Chrome, or whatever you prefer. Add a separate tool that brings all of Arc's sidebar features on top - the persistent sidebar, Spaces, Command Bar, Air Traffic Control, Live Tabs, link previews, and pinned items. Your workflow survives even if you switch browsers later.

I'll cover both approaches, but I'll be honest about my bias: I built SupaSidebar specifically because Approach 2 didn't exist when I left Arc. I'll flag every section where SupaSidebar is relevant so you can skip it if you just want browser comparisons.

Full Browser Alternatives Compared

Dia (The Browser Company's New Direction)

Dia is what The Browser Company built after Arc. It's an AI-first browser focused on knowledge work - summarizing pages, automating repetitive tasks, creating "Dia agents" that act on your behalf. Dia launched publicly on macOS on October 9, 2025. If you have searched for "Arc Browser AI features 2026," you have probably already discovered that Arc itself never got serious AI features - that work is happening in Dia.

What it keeps from Arc: Very little. Dia doesn't have Arc's sidebar, Spaces, or command bar in the same form. It's a fundamentally different product built for a different use case.

Dia vs Arc Browser comparison (2026):

• AI integration: Dia has it built into the address bar and as autonomous agents. Arc has nothing comparable - "Ask on Page" is the only AI surface, and it has not been updated.
• Sidebar / Spaces: Arc has them as the core organizing principle. Dia does not.
• Command bar: Arc's Cmd+T is a search-everything interface. Dia's address bar is more conversational/AI-driven.
• Platform: Arc is Mac and Windows. Dia is currently macOS only.
• Active development: Dia ships updates regularly. Arc does not.

What it's good for: If you want AI deeply integrated into browsing, Dia is interesting. It's not trying to be "Arc 2.0."

What it's missing: The sidebar workflow. If you loved Arc for its spatial organization, Dia won't scratch that itch.

Dia vs Arc - direct comparison:

The Browser Company kept the company name when Atlassian acquired it; they did not keep the product idea. If you came to Arc for the sidebar workflow, Dia is not the natural successor - it's a different product entirely.

Brave Browser

Brave's vertical tabs (launched in 2023 with v1.52) give you the sidebar layout. It's Chromium-based, so all your Chrome extensions work. Built-in ad blocking is genuinely good - in my own informal testing on ad-heavy news sites, Brave loaded pages noticeably faster than Chrome without an ad blocker (roughly 30-40% in my measurements; your numbers will vary by site and network).

What it keeps from Arc: Vertical tabs, some sidebar functionality. No Spaces equivalent.

What it's missing: Persistent pinned tabs across sessions, Spaces, the command bar experience.

Zen Browser

Zen is the open-source Firefox-based browser that's been gaining traction in 2025-2026. Its sidebar and workspace features are the closest any browser gets to Arc's model.

What it keeps from Arc: Sidebar with workspaces, customizable layouts, strong privacy defaults.

What it's missing: macOS integration is weaker than Arc's was. Some users report performance issues with many tabs. Extension ecosystem is Firefox-based (smaller than Chrome's).

Safari + Extensions

Safari is the performance king on Mac. Battery life alone makes it worth considering - in my own everyday usage on a MacBook Air M2, Safari ran roughly 2-3 hours longer per charge than Chrome with the same workload (a personal observation, not a controlled benchmark). But Safari's tab management is basic: no vertical tabs, no Spaces, limited sidebar functionality.

Safari Tab Groups exist but they're clunky compared to Arc Spaces. You can't see all your grouped tabs at a glance without clicking into each group.

What it keeps from Arc: Nothing, really. Safari is a different philosophy.

What it's missing: Everything that made Arc special.

Vivaldi

Vivaldi has more customization than any other browser. Tab stacking, custom sidebars, web panels, keyboard shortcut editor - if you want to rebuild your workflow from scratch, Vivaldi gives you the building blocks.

What it keeps from Arc: The spirit of customization. Tab stacking is a rough Spaces equivalent.

What it's missing: Simplicity. Vivaldi's settings page has hundreds of options. Arc's magic was that the workflow felt intuitive without configuration. Vivaldi requires serious setup time.

Is There an Open-Source Arc Browser Fork?

No. Arc itself is closed-source - The Browser Company never open-sourced it, and after the Atlassian acquisition that's unlikely to change. There is no community fork of Arc as of May 2026.

The closest "open-source Arc" is Zen Browser - Firefox-based, fully open source on GitHub, built specifically to recreate Arc's sidebar and workspaces. For users searching "open source Chromium browser like Arc," Zen is technically Firefox-based (not Chromium), but it's the only project actively building Arc-style features in the open.

If you specifically need Chromium-based, Brave is the closest open-source Chromium browser with vertical tabs, but it's not trying to replicate Arc's full workflow - it's a privacy-focused browser that happens to have a sidebar layout.

Comparison Table: Arc Alternatives at a Glance

The Hybrid Approach: Keep Your Browser, Add the Sidebar

This is the approach I'm biased toward, because it's the problem I built SupaSidebar to solve.

The pitch is simple: instead of switching browsers (again), you add a universal Mac sidebar to whatever browser you already use. Your tabs, bookmarks, and web apps live in the sidebar. The sidebar works across 25+ browsers including Safari, Chrome, Firefox, Arc, Zen, Vivaldi, Brave, Helium, and Dia, plus Finder.

One Reddit user put it perfectly:

"I would love to try to wean myself off Arc and switch to Safari for full macos integration. But without Arc sidebar that will never happen. But... is there a solution for that? SupaSidebar?"

The answer is yes. And the key difference from browser-level solutions is that if you switch browsers tomorrow, your bookmarks and sidebar come with you.

Here's what the hybrid approach actually looks like, in two parts.

Part 1 - The basics: sidebar, Spaces, pinned tabs, and the command bar.

Part 2 - The advanced stuff: Air Traffic Control, Split View, Search a Website, Little Arc, and more, across Chrome, Safari, and any browser you use.

What SupaSidebar Replicates from Arc (the full list)

This section is going to be detailed because it is the question that matters most: does SupaSidebar actually give you Arc back? Here is feature by feature.

The two Arc features SupaSidebar cannot replace

Being honest: there are two Arc features that no Arc alternative on the market can give you back, and SupaSidebar is not an exception.

• Boosts (per-site CSS injection) - this is a browser-engine feature. Since SupaSidebar is not a browser, it cannot inject CSS into web pages. If Boosts are central to your workflow, Zen Browser shipped a native Boosts feature in v1.20b (May 2026) at the engine level. On Safari, Chrome, Firefox, or any other base browser used with SupaSidebar, the closest workaround is a userstyle browser extension like Stylus or Cascadea.
• Easels (shared visual whiteboards) - Arc's notebook-style pages. Not currently replicated. For most use cases, Notion, Apple Notes, or a dedicated whiteboard tool is a closer fit anyway.

If Boosts was your favorite Arc feature, this is the one trade-off you have to accept regardless of which Arc alternative you pick.

What SupaSidebar Doesn't Do (other gaps)

A few honest limitations beyond Boosts and Easels:

• No Windows support - macOS only. If you are cross-platform, SupaSidebar will not work on your PC.
• No mobile companion - no iOS app. Your sidebar is desktop-only.
• Not a browser - SupaSidebar does not render web pages. It manages your relationship with browsers. You still need Safari, Chrome, or another browser to actually browse.

Thousands of Mac users are currently using SupaSidebar. As one user put it after switching from Arc:

"Moved from Arc to Safari, only thing I missed was the sidebar. This is it."

How to Actually Migrate from Arc Browser

There are two migration paths and they look nothing alike. One takes 2 minutes. The other usually takes a weekend and leaves you rebuilding your sidebar by hand.

For the full migration playbook including what you'll lose, what you'll gain, the personal switching experience, and what SupaSidebar can't replace, see Switching from Arc Browser - the canonical migration reference. For the official Arc import documentation, see the Import Bookmarks guide.

Can You Keep Using Arc Until December?

Yes, until December 22, 2026. Until October 2026 there was a real case for staying on Arc, since it worked and still got security patches. That case ended when The Browser Company set a shutdown date. Arc keeps working with basic updates until December 22, then stops on macOS and Windows, and every Arc account is deactivated.

My recommendation is to import your Arc sidebar now, while Arc still works, and run both in parallel for a few weeks. You get to compare them side by side instead of moving in a rush in the last week.

Conclusion: Picking the Right Arc Browser Alternative in 2026

Arc Browser stops working on December 22, 2026. The sidebar workflow that made Arc special - Spaces, pinned tabs, folders, command bar - goes with it, and the team is not coming back to build it. Whatever workflow you choose next has to either replace Arc's sidebar or recreate it.

Here is the short version of the recommendation, by what you valued most about Arc:

• The sidebar workflow (most common Arc user) → SupaSidebar. It imports your Arc Spaces, folders, and pinned tabs in 3 clicks, and it is the only option that keeps them on top of any browser - 25+ browsers including Safari, Chrome, Firefox, Arc, Zen, Vivaldi, Brave, Helium, and Dia. Free version available. You don't have to switch browsers.
• A full browser replacement that feels like Arc → Zen Browser. Firefox-based, fully open source, has Spaces. Trade-off: Firefox extension ecosystem (smaller than Chrome's). Since Zen 1.24b, its import wizard brings Arc's Spaces and pinned tabs across.
• Vertical tabs with full Chrome extension support → Brave. Chromium-based, vertical tabs work, decent ad blocking. Trade-off: no real Spaces, no command bar, no pinned-tab persistence.
• Maximum Mac performance and battery life, sidebar via SupaSidebar → Safari plus SupaSidebar. Best battery life on Mac, the only real downside is Safari's smaller extension ecosystem.
• AI-first browsing, Arc sidebar not required → Dia. Made by the same team that built Arc, but it is not Arc 2.0 - different product, different use case.

If you want the lowest-effort migration: download SupaSidebar, run the 3-click Arc import, and you are done in under 2 minutes. If you want a full browser switch, pick Zen if you want Arc-like, since it now imports Arc's Spaces, or Brave if you want Chrome extensions and can accept the manual rebuild.

The worst choice is to do nothing. Arc still works today, but it stops on December 22, 2026. Migrating now on your own terms beats migrating in a panic in the last week.

Try SupaSidebar (free) - imports your Arc sidebar in 3 clicks, works with any browser.

Frequently Asked Questions