OpenArch Download

Arc stops working on December 22, 2026.

Arc closes.
OpenArch opens.

The sidebar browser you know, rebuilt as open source on real Chrome. Spaces, favorites, the command bar and every extension, with your Arc data moved over in one step.

Download for Mac Source on GitHub

Free and MIT licensed. Early build for macOS 15 or later on Apple silicon.

OpenArch with a green sidebar: favorite sites, pinned folders, open tabs, and a Wikipedia article about arches

Everything comes along.

OpenArch reads your Arc data right on your Mac and takes it over: no account, no upload. Arc itself stays untouched, and if OpenArch had data before, it is kept as a backup.

Travel

⌘T finds everything.

One field for addresses, searches, open tabs, pinned pages, history and commands. Start typing, and Enter takes you there, or straight back to the tab you already have open.

The command bar in the blue Travel space, searching for “arches”: a matching open tab and search suggestions
Split View in the orange Home space: two Wikipedia articles, Sourdough and Bread, side by side

Home

Two pages, one view.

Drag a tab from the sidebar onto the page, or press ⌃⇧=. Up to four pages side by side, with dividers you can drag.

Work

A space for every part of your day.

Each space has its own color, pinned folders and tabs. Give it its own profile and it keeps its own logins, cookies and extensions too, so work and private Google accounts never mix. Swipe sideways over the sidebar to move between them.

The library in the green Work space, listing the spaces Work, Home and Travel

Your hands already know it.

Arc’s shortcuts work in OpenArch, and they win over the page, just like in Arc.

⌘T
Command bar
⌘L
Edit the address
⌘S
Show or hide the sidebar
⌘D
Pin or unpin a tab
⌃1–9
Go to a space
⌘1–9
Go to a tab in the sidebar
⌃Tab
Recently used tabs
⌃⇧=
Split View
⌥⌘N
Little OpenArch, a small window for quick links
⌘⇧L
Library: media, downloads, spaces, archive
⌘⇧K
Clear today’s tabs
⌘⇧T
Reopen a closed tab

Not there yet: Peek, Boosts, Easels and Notes.

Real Chrome tabs. All your extensions.

Every tab is a full Chrome tab, so password managers fill in, ad blockers block, side panels open and DevTools dock exactly as in Chrome. Install from the Chrome Web Store, or bring the ones you had in Arc.

New Chromium releases arrive by themselves: a daily job builds OpenArch with each stable version and publishes it when everything works.

Let your agent drive.

Turn on AI control and OpenArch opens Chrome’s DevTools protocol on your Mac. Claude Code, Playwright or Puppeteer can then open pages, click, fill in forms, read the console and take screenshots, in your real browser with your logins. One line connects Claude Code:

claude mcp add openarch -- npx -y chrome-devtools-mcp@latest --browser-url=http://127.0.0.1:9222

Off by default. While it is on, an antenna in the sidebar says so, because any program on your Mac could then steer the browser.

No account. No cloud. Open source.

Stays on your Mac

Spaces, history and profiles live in ~/Library/Application Support/OpenArch.

Nothing phones home

OpenArch has no servers, no telemetry and no sign-in.

Yours to change

The whole browser is on GitHub under the MIT license.

Questions

Is this made by The Browser Company?

No. OpenArch is an independent open-source project. It is not affiliated with The Browser Company or Atlassian, and it contains no code from Arc.

macOS says it can’t check OpenArch for malware.

Early builds are not notarized yet. Unzip OpenArch, move it to Applications, then run xattr -dr com.apple.quarantine /Applications/OpenArch.app in Terminal, or allow it under System Settings › Privacy & Security.

What language is the interface in?

German, for now. English is next.

Does it run on Intel Macs?

Not yet. Builds are for Apple silicon and macOS 15 or later.

What happens to my Arc data?

OpenArch only reads it. For logins and passwords, macOS asks you once whether OpenArch may use Arc’s key from your keychain.

Ready when Arc isn’t.

Download for Mac

Free. Open source. Your tabs come along.