The Best AI Browser: Which Ones Actually Still Work

On 9 August 2026, ChatGPT Atlas stopped working. OpenAI's own support page was blunt about it: "Atlas is scheduled to stop working on August 9, 2026." After that date, it warned, Atlas "may no longer open, browse, or support browser-based agentic workflows." Atlas had launched on 21 October 2025, which gave it a lifespan of 292 days. Search for the best AI browser today and you will still find Atlas in the top five of lists published by sites with far more authority than this one. Some still quote a monthly price for a product that no longer starts.

That is the real problem with this category. It is not that there are too few AI browsers, it is that the ones people recommend keep dying, and the roundups do not get updated. This guide covers only what is verifiably still running as of today, what each one costs, which platforms it is actually available on, and the security question that most lists skip entirely. Every price and requirement below comes from the vendor's own page.

The Key Takeaways

• Start with Comet: it is free, it has a real agent, and Perplexity lists it as "available for Mac, Windows, iOS, and Android", which no rival matches.
• Four have died in fifteen months: ChatGPT Atlas, Arc, Sidekick, and Edge's Copilot Mode as a separate product. Atlas lasted 292 days.
• Dia is Apple Silicon only: its own site says "macOS 14+ with M1 chips or later". No Intel Mac, no Windows.
• The extension route is often better: Claude in Chrome has 13 million users and a 2.7 star rating, which tells you more than any review does. Since 12 August 2026 its side panel is a full Claude Cowork session, so work started in a tab continues on desktop and mobile.
• Nobody has solved the safety problem: Anthropic's own documentation says its extension "is enhanced with our safety classifiers but is still risky".

What Is an AI Browser?

An AI browser is a web browser with a language model built into the interface rather than bolted on as an extension. Instead of only loading pages, it can summarise what is on screen, answer questions about your open tabs, and in agentic browsers such as Perplexity Comet, click through a task on your behalf.

Three things get called "AI browser" and they are not the same product, which is most of the confusion in this category:

The agentic layer is where the interesting capability and all of the risk live. A summariser reads. An agent acts, using your logged-in sessions, which is a very different thing to hand to software. If the distinction is new to you, the fuller explanation is in our guide to what agentic AI actually means.

The Best AI Browser: The Shortlist

Everything in this table was checked against the vendor's own page. The status and platform columns are the two that the big roundups leave out, and they are the two that matter most right now.

Perplexity Comet: Start Here

Comet is the default recommendation, and the reasons are boring rather than exciting. It is free. It has a genuine agent rather than a summariser with ambitions. And Perplexity's own product page states it is "available for Mac, Windows, iOS, and Android", which means it is the only one on this list you can use on every device you own.

That last point is doing more work than it looks. Atlas never shipped on anything but macOS and then died. Dia is Mac-only and Apple Silicon only. Claude's extension does not run on mobile at all. Cross-platform availability is rare here, and it is the difference between a tool you adopt and a tool you try.

What Comet is good at is research: reading across your open tabs, comparing sources, and answering questions about what you are looking at with citations. What it is less good at is being trusted with a logged-in session, which is covered further down. If you already pay Perplexity, our breakdown of what each Perplexity plan includes covers where Comet sits.

Dia: The Mac-Only Option With a Complicated Parent

Dia comes from The Browser Company, the team behind Arc, and it is the clearest example of why this category needs a status column. Atlassian announced on 4 September 2025 that it had agreed to acquire the company. Its stated plan is to "make Dia the browser: Optimized for the SaaS apps where you spend your day." Arc, meanwhile, has been frozen since May 2025. The Browser Company's own letter to Arc members that month said it had "stopped actively building new features" and is "not actively developing the core product experience like we used to", while continuing Chromium upgrades and security fixes.

So Dia is the actively developed product and Arc is the frozen one, which is the reverse of what most people assume, since Arc is the name they have heard of. Any list still recommending Arc Max as a current AI browser is recommending a product its own maker stopped building.

Dia's constraint is stated plainly on its download page: "Currently available on Apple macOS 14+ with M1 chips or later." That rules out every Intel Mac. The download includes a 14 day free trial of its paid tier. As a reading and writing assistant it is the most refined thing here. As a cross-platform browser it does not compete, because it does not try to.

The Extension Route: Gemini and Claude in Chrome

For a lot of people the honest answer is that you do not want a new browser at all. You want the AI in the browser you already use, with your extensions, passwords and profiles intact. Two options do that properly.

Gemini in Chrome

Google put Gemini directly into Chrome as a side panel, and added an agentic layer it calls auto browse. Google's own plans page describes it as letting "Gemini in Chrome complete tasks for you with auto browse. For example, it can research hotel and flight costs across multiple date options." The catch is in the same sentence on that page: auto browse is "available to Google AI Pro and Ultra users in the US."

So the side panel is broadly available and the part that actually does things is gated behind a paid plan and a country. If you are weighing whether that plan is worth it for more than the browser, our full Gemini pricing breakdown covers what each tier includes.

Claude in Chrome

Anthropic's extension is the strongest option for long documents, and it is also the most revealing entry on this list. Its Chrome Web Store listing shows 13,000,000 users and an average rating of 2.7 stars from around 1,500 ratings, last updated on 7 August 2026. Enormous reach, mediocre satisfaction. That gap is the most honest summary of the entire AI browsing category that exists in public.

Anthropic's own setup documentation is unusually candid about the limits. "Claude in Chrome is available for all paid plans (Pro, Max, Team, and Enterprise)," so there is no free route in. It "is not supported on other Chromium-based web browsers or mobile devices," so Edge, Brave, Opera and your phone are out. The side panel is still in beta.

It also stopped being just a sidebar. On 12 August 2026 Anthropic turned the side panel into a full Claude Cowork session, which is the change that separates it from every other entry on this list. Your conversations save to your history, your skills and connectors work inside the browser, and a task you start in a tab can be finished later on the desktop, web or mobile app. It landed on Max and Team plans that day and is rolling out to Pro over the following weeks. On Enterprise it is off by default, and admins can switch it on and restrict it to approved domains.

The point of it is the software that has no AI integration of its own. Anthropic's framing is that plenty of tools connect to Claude directly, but internal dashboards, legacy systems and vendor portals never will, so the browser becomes the connector. Claude can click links, type, navigate between pages and fill in forms using the logins you already have. That is genuinely useful and it is also exactly the capability that makes the security section below worth reading.

Opera Neon and Brave Leo

Two products round out the list for people whose priority is neither research nor staying in Chrome.

Opera Neon is the paid, agent-first option. Opera describes it as "a browser built to act" and charges "$19.90/month" to "activate agentic functionalities and top world LLMs". It is the only browser here that asks for money up front, and it is aimed at people who want agents chaining multi-step work rather than a chat sidebar.

Brave Leo is the opposite trade. It has no agent, and that is the point. Brave states that "Leo doesn't retain or share chats, or use them for additional model training," that "no account or login is required," and that it does "not collect identifiers that can be linked to you (such as IP Address)". It runs on macOS, Windows, Linux, Android and iOS, has a free tier, and offers a premium tier with more models. If your objection to AI browsers is what they see rather than what they can do, Leo is the one to look at. The broader version of that question is covered in our guide to using AI without giving up your privacy.

The AI Browsers That Died

This is the section no affiliate-funded roundup will write, and it is the most useful one on the page. Four products that appear on current first-page results are gone or frozen.

The Atlas case is worth understanding in detail, because it is the template. OpenAI's own migration guidance warned that bookmarks, open tabs and browsing history would not carry over on their own, and told people to export them by hand. That page is inconsistent about which of the three was a hard "will not" and which was a softer "may not", which tells you something about how quickly it was written. Anyone who built a workflow on Atlas had roughly thirty days to get their data out. We covered the migration in what to switch to now that Atlas is gone, and the full story of the product in what happened to OpenAI's browser.

The lesson is not that AI browsers are doomed. It is that switching browsers is one of the highest-friction things a person does with a computer, and the category is consolidating fast enough that betting your bookmarks on a nine-month-old product is a genuine risk. Weight that when you choose.

Are AI Browsers Safe?

Comet is reasonably safe for reading and research, and risky for anything involving a logged-in account. Brave's security team demonstrated an indirect prompt injection in which a Reddit comment carrying hidden instructions made Comet open the user's Perplexity account page, pull a one-time code from their Gmail, and post both back as a reply. Brave reported that Perplexity had not fully mitigated it.

The detail that matters is the mechanism, not the incident. In Brave's August 2025 write-up, the instructions were hidden behind a spoiler tag, and the user did nothing more dangerous than click "Summarize the current webpage". Brave's diagnosis was that Comet "feeds a part of the webpage directly to its LLM without distinguishing between the user's instructions and untrusted content from the webpage". Two months later the same team showed the attack working through screenshots, using faint light blue text on a yellow background that OCR reads and human eyes do not. That one was Comet again. The same post demonstrated a separate navigation-based injection against Fellou, and Brave disclosed a third flaw in Opera Neon at the end of October 2025, using instructions hidden in elements set to zero opacity.

This is not a Perplexity problem, it is the category's problem. OpenAI, writing about its own browser agent in December 2025, called prompt injection "a long-term AI security challenge" and compared defending against it to "ever-evolving online scams that target humans". In the same post it went further, saying prompt injection "is unlikely to ever be fully 'solved'". Anthropic's documentation says its extension "is enhanced with our safety classifiers but is still risky". Announcing the Cowork side panel in August 2026 it described a further defence, a separate check that reviews a consequential action such as submitting a form or starting a download "against what you originally asked for and blocks anything that doesn't match", and then conceded the point in the same breath: "These measures meaningfully reduce the risk, they cannot eliminate it." Both vendors are describing an unsolved condition, not a bug awaiting a patch. Our explainer on why prompt injection resists fixing goes through the reasons.

Practical rules that follow from this: do not run an agent in a browser session logged into your bank or your email. Keep agentic browsing in a separate profile from your real accounts. Require confirmation before anything sends, buys or shares. And treat "summarise this page" on an unfamiliar site as an action, because it is one.

Which Is the Best AI Browser for Mac?

Mac users get a slightly different answer, because the Mac is where this category has been most active and most brutal.

Atlas was macOS-only and it died. Dia is macOS-only and Apple Silicon only, which cuts out every Intel Mac at exactly the moment macOS 27 drops Intel support anyway. Comet is the only one that runs everywhere. If you want a single recommendation for a Mac, it is Comet for the browser and Claude in Chrome if you would rather keep the browser you have.

The structural limit is worth naming before you commit to any of them. An AI browser welds one vendor's model to your browsing. Comet gives you Perplexity. Dia gives you Atlassian's stack. Gemini in Chrome gives you Gemini. The moment you want a second opinion from a different model, you are back to opening tabs, which is the thing the AI browser was supposed to fix. That is a limitation of the category rather than a criticism of any one product, and it is why a lot of Mac users end up running a multi-model app alongside a normal browser instead of switching browsers at all.

The Verdict

Install Comet. It costs nothing, it runs on every device you own, and it is the only entry here that is both cross-platform and properly agentic. Keep it out of sessions where you are logged into anything that holds money or mail.

If switching browsers is not something you are willing to do, and for most people it should not be, add Claude in Chrome or the Gemini side panel to the browser you already use. You get most of the benefit with none of the migration risk, and since August the Claude panel carries its work over to the desktop and mobile apps rather than stranding it in a tab. Skip anything that asks you to move your bookmarks into a product younger than a year, because the last four that asked are no longer running.

FAQ