Every browser wants to be an AI browser now. I installed six of them over the past month to find out which ones actually change how I use the web, and which are a chatbot sidebar bolted onto Chrome and called innovation.

Three made the cut. Three didn't. The split had nothing to do with which company built them or how much money was behind the launch — it came down to one question, asked repeatedly, every single day I used them: does this save me a step, or does it just add one more window I have to think about?

Perplexity Comet — the one that works everywhere

Comet is the AI browser I use most, and the deciding factor genuinely is availability rather than brilliance: it's the only one of the three that runs on Windows, Mac, iOS and Android, and it's free. I already lean on Perplexity for most of my day-to-day search, so Comet felt less like a new tool and more like that same habit growing a browser around it — a sidebar that can summarise the article I'm on, compare two tabs I've got open, or pull a spec sheet out of a product page without me tabbing back and forth.

It's built on Chromium, so my bookmarks, extensions and muscle memory carried over on day one — no relearning a new browser's furniture. The trade-off is that Comet's assistant is noticeably more cautious than the other two about acting on pages for you. It'll summarise and answer questions all day; ask it to actually book something or fill in a multi-step form and it hesitates in ways Atlas doesn't. If Comet sounds like the one you want to try, I wrote up the exact setup I'd actually hand someone, step by step, including the one thing I'd do differently if I started again.

ChatGPT Atlas — the one with actual hands

Atlas is OpenAI's browser, Mac-only for now, and it's the one that made me nervous in the way genuinely useful tools sometimes do. With agent mode switched on — a Plus or Pro feature — it will click through a site on your behalf: add items to a cart, fill in a booking form, work through a multi-page settings menu you couldn't be bothered to read. I gave it a return to process on a retailer's site I use often, and it navigated four pages and a confirmation dialog without me touching the trackpad once.

That's also exactly why it's the one I trust least with anything that matters. Watching an AI click buttons on your behalf is a different feeling from reading its answer to a question — one is advice you can ignore, the other is an action already taken. If you're still getting your footing with the basics before handing a browser your clicks, my ChatGPT for beginners guide is the right place to start; agent mode is very much not a beginner feature, whatever the onboarding screen implies.

Dia — the one that made me trust it with more

Dia comes from the team behind Arc, Mac-only and Apple Silicon-only, and it's the most restrained of the three — which, after a month of the other two, I ended up preferring for a specific slice of my week. It's built around reading and understanding rather than acting: ask it about a long PDF or a dense research page and it answers from what's actually open, with none of Atlas's appetite for clicking things.

It's also the only one of the three that encrypts what it processes locally and gives you real control over what it can see — the team pulled a web-fetch feature before launch after finding it could be exploited via prompt injection, then rebuilt it with structural limits rather than just patching the hole. That's a more honest response to the actual risk than either Comet or Atlas has publicly given, and it's the reason Dia is the one I now open for anything involving a document I'd rather not paste into a random chat window.

"None of the three replaced my old browser. They replaced the twenty small tab-switches a day I didn't notice I was doing."

The three I uninstalled within a week

  • Microsoft Edge's Copilot Mode. Capable on paper, but it kept surfacing suggestions I hadn't asked for while I was just trying to read a page, and there was no obvious way to turn that down without turning the whole feature off.
  • Opera Neon. Interesting ideas — an on-device task list, some genuinely clever tab management — but the AI layer itself felt like a beta bolted onto a browser that was already fine without it.
  • Brave with Leo switched on. Leo is a solid chatbot in a sidebar and nothing more than that. It never once acted on a page for me, which means it never earned the extra click over just opening a chat tab.

How I'd actually pick, if I only had time to try one

Windows user, or want something free that works everywhere: Comet. Mac user who wants a browser that does real work on your behalf and you're comfortable watching it click: Atlas, agent mode on. Mac user who wants the AI layer without handing over the keys: Dia. None of these are permanent choices — I still keep a plain, boring browser installed for banking and anything with a password I actually care about, and I'd tell anyone reading this to do the same. If you want the fuller list of AI tools and workflows I actually run day to day, not just the ones that made headlines this month, my AI tools hub is where I keep it updated.

The honest verdict after a month, not a launch-day first look: Comet for most people, because it's free and it's everywhere. Atlas if you want a browser that genuinely acts for you and you're on a Mac. Dia if privacy is the thing that's been holding you back from any of this. Skip the rest — a sidebar chatbot with no ability to act on the page isn't an AI browser, it's a browser with a chat window taped to the side.

What I'd tell a friend before they install any of them

Don't expect one browser to win outright — I run two of these three depending on what I'm doing, and that's not indecision, it's the honest state of this category right now. Keep your old browser around for banking, and don't hand agent mode a task you haven't watched it do successfully once already. If you want the next honest verdict before it goes anywhere else, join the Brite newsletter — I only write when something's actually worth saying.

Questions people actually ask

Which AI browser should I actually install first?

Perplexity Comet, if you have to pick one, mainly because it runs on Windows, Mac, iOS and Android and doesn't cost anything. ChatGPT Atlas and Dia are both Mac-only, so half the readers of this ever asking the question don't have a choice to make.

Are AI browsers safe to use for banking or email?

I don't route either through mine, and I'd say the same to anyone. An AI browser reads the page to act on it, which is exactly the mechanism a prompt-injection attack exploits. I keep a plain browser for banking and anything with a password that matters, and use the AI ones for research, shopping and reading.

What's the actual difference between an AI browser and just using ChatGPT in a normal tab?

An AI browser can see and act on whatever page you're already looking at, without you copying anything into a chat window. That's the entire pitch. Ask a question about the article on screen, or tell it to fill in a form, and it works with the page's actual content rather than something you've pasted in.

Do AI browsers replace Chrome or Safari completely?

Not for me, and I don't think they're trying to yet. All three I kept are built on the same Chromium engine most browsers already use, so ordinary browsing feels identical — the AI layer is what's new, and it's still a layer I switch in and out of rather than living in permanently.