AI Browser Comparison: The Short Answer
Choose Comet if you want it on both phone and computer. Choose Dia if you need to connect many work tools. If you already use ChatGPT, installing the ChatGPT extension in your current browser is enough. If you like Chrome, use the built-in Gemini in Chrome.
What Is an AI Browser
An AI browser is a browser with a built-in AI assistant. In Comet, for example, the assistant can summarize the tab you are viewing, and you can use @tab to ask about the contents of another tab.
The more advanced feature is called “agent mode”: you hand over a task, and the AI completes multi-step actions on websites for you, such as comparing products or adding items to a cart. To understand how AI does things on its own, see What Is an AI Agent.
Comet, Dia, ChatGPT, and Gemini Compared
In the “Paid” column, Pro, Max, Better Answers, Better Days, and Plus are the names of each company’s paid plans.
| Item | Platforms | What you get free | Paid | Best for |
|---|---|---|---|---|
| Comet (Perplexity) | Mac, Windows, iOS, Android | Works without logging in. Logging in adds saved conversations, sync, and higher limits, but no agent quota | Agent mode on the web needs a paid plan: Pro at US$17 a month on annual billing, Max at US$200 monthly or US$2,000 yearly (yearly is web only) | People who want every platform and research a lot |
| Dia (The Browser Company, part of Atlassian) | Mac, Windows | The free version is a browser without AI. New users get a 14-day AI trial. The Windows version and existing users stay as they are | Better Answers US$10 a month, Better Days US$100 a month | People with many work tools |
| ChatGPT extension | Chrome, Edge, Brave, Opera, Vivaldi | Features depend on your plan and workspace settings | Plus US$20 a month | People who already use ChatGPT and do not want to leave Chrome |
| Gemini in Chrome | Chromebook Plus, Mac, Windows | Taiwan is on the list of supported regions for users 18 and older | Auto browse needs Google AI Plus, Pro, or Ultra, and is US-only for now | People who like Chrome |
Prices are as of November 14, 2026, in US dollars. The checkout page shows the final amount in your currency.
What Makes Each One Different
- Comet (Perplexity’s browser): Works on all four platforms, Mac, Windows, iOS, and Android. You can use it without logging in, and logging in adds saved conversations and cross-device sync. The free version has no agent quota. Pro and Max have monthly limits, and Max’s limit is the highest. For details, see the complete Perplexity tutorial.
- Dia: Built around connecting your work tools, such as Slack, Notion, and Teams. AI features have a monthly allowance that resets each cycle. If you want more, you can buy extra usage at US$20 each time, or turn on automatic top-ups.
- ChatGPT: To let it operate your Chrome, open Settings in the desktop app, click Computer Use, choose Chrome, and follow the prompts to install the extension (an add-on that installs into your browser). Then open a Work or Codex conversation, type ”@”, pick Chrome, and give it a task. Work handles multi-step jobs, and Codex leans toward coding. If you do not want the desktop app, you can use @Chrome directly in the ChatGPT web app. For the plan differences, see the ChatGPT Plus guide.
ChatGPT Atlas Is Retired
Atlas was OpenAI’s AI browser. OpenAI says Atlas is retired and no longer updated. Bookmarks, tabs, and browsing history do not transfer automatically, and you need to log back in to sites in your new browser. Your ChatGPT conversation history is separate from Atlas. Whether you can still access it depends on your plan, workspace settings, and account permissions.
ChatGPT’s browsing features now consist of the built-in browser in the Mac and Windows desktop apps, plus an extension that connects to the browser you already use.
Keeping Your Browser: Gemini in Chrome and Auto Browse
Chrome has Gemini built in, and Taiwan is on the list of supported regions for users 18 and older. On desktop you need Chromebook Plus, Mac, or Windows, the latest Chrome, and a logged-in Chrome profile (it does not work in Incognito mode). Your device language must also be a supported one. Work or school accounts must be enabled by an administrator.
Auto browse, the term you often see in Google Search, is its agent feature: you give a task, and Gemini completes multi-step actions on websites, such as comparing products, adding items to a cart, or booking travel. It has these requirements:
- 18 or older, and located in the US
- A personal account subscribed to Google AI Plus, Pro, or Ultra
- Device language set to English
- Desktop only, not available on iPhone or iPad
- Chrome’s Safe Browsing set to Standard or Enhanced
- Not available in Incognito mode
- Not supported on school accounts
For now, auto browse is US-only, so unless you meet the location requirement, just look at Gemini in Chrome itself. Google labels auto browse as experimental, and you confirm steps like purchases and logins yourself.
Safety Basics Every Beginner Should Know
Agent features act with the identity you are already logged in with. If your email, shopping sites, and bank are all logged in, then once you let the AI use a site, it can click buttons using those accounts.
When you install the ChatGPT extension, the browser shows a permission prompt that lists items like reading and changing data on all websites. This is a permission agent mode needs, and its scope is wide, so ChatGPT asks you before it uses each new site by default.
A common risk is called prompt injection: someone hides instructions in a web page that you cannot see but the AI can read, and the AI may treat them as your request when it reads the page.
OpenAI’s guidance says to treat web page content as untrusted information. Perplexity says no defense is perfect. Dia also says prompt injection can still affect the assistant’s answers, and it advises not handing it regulated data such as medical records.
For more real cases, see AI Agent security risks.
How to Try Them Safely
- Start with summaries and Q&A only: Once you are comfortable, try agent mode.
- Exclude important sites: In Comet, you can block the assistant from specific sites in settings, such as your bank. ChatGPT asks you about each new site by default, so just choose “Allow once”. The “allow all sites” setting is marked as higher risk by the official docs, so beginners should leave it off.
- Stay and watch while it acts: For payments, sending email, or deleting things, confirm and click yourself.
Penchan’s Take
With Atlas retired, look at Comet and Dia if you want to switch browsers, and use the ChatGPT extension or Gemini in Chrome if you want to keep your current one. Beginners should start with the free options and turn on agent mode only once they understand the risks. Dia’s free version has no AI, and only new users get the 14-day AI trial.
Further Reading
- What Is an AI Agent?
- AI Agent Security Risks
- Complete Perplexity Tutorial
- ChatGPT Plus Guide
- Complete Gemini AI Guide
This article provides consumer information about AI tools. It is not securities or investment advice. Actual features and pricing are subject to each company’s latest official announcements. The information here is current as of November 14, 2026, and may be out of date.