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Claude Cowork Browser vs Claude in Chrome and Aside

2026-08-28 · 12 min read · HabniAs of Aug 2026

Cowork's built-in browser is a desktop-app feature that lets Claude open websites, read pages, and click through tasks in a browser separated from your personal one. Anthropic announced it on August 26, 2026, and the official announcement says access is rolling out gradually.

There were already several ways to hand browser work to AI: download material from an internal portal, copy dashboard figures, or fill the same form repeatedly. Until now, that usually meant installing a separate browser such as Aside or adding an extension to Chrome.

Anthropic's official blog announcement titled Claude gets its own browser in Cowork. The page says Claude can open its own browser inside the desktop app to navigate sites, read pages, and fill forms, alongside the date August 26, 2026 (captured August 28, 2026)

Anthropic has added a third route. You do not have to replace your browser or attach an extension to the one you use every day; the browser opens inside the Cowork app you already use. This guide explains what that means, how the three options keep logins and work surfaces separate, and which one fits your situation.

Cowork built-in browser: This is a separate browser that opens in a side panel when you ask the Cowork desktop app to check a portal or fill a form. Claude navigates, reads, clicks, and types in it. It is less a complicated new tool than one extra window beside your Cowork conversation.

What are Cowork's browser, Claude in Chrome, and Aside?

All three let AI inspect a site, click buttons, and enter information. The first two are Claude features made by Anthropic; Aside is a separate browser from another company. What changes is where the work opens and which login it can use. Start with the form each one takes.

Cowork uses a panel, the extension uses a tab, Aside uses its own window

Cowork built-in browser: a window in the side panel

The built-in browser lives inside the Cowork desktop app. Ask it to find material on an internal portal or complete a repetitive form, and a browser opens in the side panel. Claude moves from navigation and reading to clicking and typing without an extension or separate setup.

According to the August 26, 2026 announcement, it is rolling out during the week to Pro, Max, and Team users of the macOS, Windows, and Linux desktop apps, with Linux marked beta. Enterprise administrators can enable it in organization settings.

Claude in Chrome: work in the tab you already opened

Claude in Chrome is an extension that lets Claude read and operate a tab you have opened in Chrome. I will call it the Chrome extension below. It can use the tab's existing login to copy dashboard figures, check a booking page, or complete a form. It is the shortest route when the work starts on the page already in front of you.

On August 12, 2026, the extension's side panel also moved to Cowork sessions. Conversations are saved in history, and skills and connectors are available in the browser. A task that starts in a tab can continue across desktop, web, and mobile. Anthropic released this first to Max and Team, with Pro access rolling out gradually afterward.

Aside: replace the browser itself

Aside is not a Claude feature and not an extension. It is a separate browser from another company. You use its own address bar, tabs, settings, and browser profiles while asking AI to search sites, collect material, and enter information.

Aside has a Free tier and supports multiple profiles, which makes it useful for separating login accounts. As of August 2026, it requires macOS 15 or later and has no Windows or mobile version.

Its profile and permission controls matter most when you want work and personal accounts kept apart.

The comparison fits in one table.

Login and screen situation	Claude in Chrome	Cowork built-in browser	Aside
Site where you are already signed in	Uses the login in the tab you provide	Uses selected logins imported from Chrome, Edge, or Firefox	Uses the login saved in its profile
Site where you are not signed in	Pauses until you sign in	Pauses until you sign in unless you imported that login	Can continue with a saved account, such as a configured Google login
Using another screen during the task	The work tab must remain open, but you can use other tabs	Runs in Cowork's side panel	Keeps running when its window is minimized

Designed not to mix with your personal browser

The main feature is not the list of actions Claude can take but the way the browser is isolated. While using it, Claude does not see the tabs, bookmarks, or passwords in your personal browser. You select only the site logins you need from Chrome, Edge, or Firefox. Banking, email, and single sign-on sites are excluded from import unless you explicitly choose them. You are handing over selected work sites, not your entire everyday browser.

One risk remains. Prompt injection is an attack in which instructions hidden on a webpage try to steer Claude away from your original request. Anthropic says its defenses reduce that risk but do not eliminate it. Selective login import limits the potential damage; it does not stop the attack itself. Start with sites you trust.

What changes for Cowork and Chrome extension users

The built-in browser does not make every browser task possible for the first time. Cowork could already organize data from services connected through connectors, and the Chrome extension could inspect a booking page and enter information in the tab you opened. What changed is the range of sites Cowork can reach inside the app and the amount of setup required.

Sites without a connector: Cowork can now work directly in a portal that has no connector. It can read, click, and type on an internal portal or government site instead of waiting for a purpose-built integration.
The Chrome work tab: the extension lets you hand Claude one tab and continue working in another. But the work tab must remain open, and you return to it when the task ends. Cowork's browser runs in the app side panel, so there is no Chrome work tab to keep open.
Extension setup: as the announcement puts it, no extension or separate configuration is required. The installation and permission-approval steps disappear.

How I would choose

On Windows, the first filter removes one option. Claude in Chrome and Cowork's built-in browser both work on Windows, while Aside requires macOS 15 or later as of August 2026. Check that constraint before comparing preferences.

On a Mac, choose by work surface and login. The Chrome extension uses the tab and login already open, so it starts fastest on the page in front of you. In return, one work tab must remain available to Claude. Cowork's built-in browser and Aside keep the AI's browser separate, and Aside can go further by separating personal and work accounts into profiles.

Work on the page already open: use Claude in Chrome. There is no page or login state to move.
Work away from your Chrome tab: use Cowork's built-in browser. It can check an internal portal or complete repeated forms inside the Cowork app, with nothing extra to install.
Separate login accounts: use Aside. Saved profiles let work continue across new sites, but only on a Mac.

For a first try, I would open Cowork's built-in browser first. It lives in the desktop app you already use and removes the installation step, so it has the lowest starting cost. If it has not appeared on your account yet, you may still be waiting for that week's gradual rollout.

Claude in Chrome is not an obsolete option that the new browser replaces. It remains the shorter route when you want Claude to act on the page in front of you. If account separation and browser profiles matter more, and you use a Mac, that is when Aside becomes worth considering.

In 30 seconds

Cowork's built-in browser opens in a side panel of the desktop app and requires no separate extension or setup.
Cowork users can now work in portals without connectors and avoid keeping a dedicated Chrome work tab open while Claude checks material or completes forms.
Use Claude in Chrome for the tab already in front of you, Cowork's built-in browser for work separated from Chrome, and Aside for profile-level account separation.
Claude in Chrome and Cowork's built-in browser work on Windows, but Aside does not.
Any AI that acts in a browser remains exposed to prompt injection, so begin with sites you trust.

Frequently asked questions

Is Claude Cowork's built-in browser free?

As of August 2026, the announced rollout covers Pro, Max, and Team plans. Enterprise administrators can enable it in organization settings. The Free plan was not included in the announcement. Aside has a Free tier.

Does the Claude Cowork browser work on Windows?

Yes. It is rolling out in the Claude desktop apps for macOS and Windows, with Linux available in beta. Claude in Chrome also works on Windows, while Aside requires macOS 15 or later.

What happens if I use both Claude in Chrome and Cowork's built-in browser?

If you already use Claude in Chrome, the Chrome extension remains the default browser. You can change the preferred browser in Cowork settings.

Is this the same as the built-in browser in Claude Code desktop?

No. Claude Code's built-in browser uses a clean profile with no saved logins, so signed-in work requires the Chrome extension. Cowork's built-in browser can import selected logins from another browser.

Is Cowork's built-in browser safe?

It is separated from your personal browser, and banking, email, and single sign-on sites are excluded from login import unless you select them. Anthropic also says prompt-injection risk cannot be eliminated, so start with sites you trust.

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#Claude Cowork#Cowork built-in browser#Claude in Chrome#Aside#AI browser comparison