What Is Perplexity Comet? A Complete Beginner's Guide

Comet Is a Regular Browser With an AI Assistant Built In

Comet is Perplexity's own web browser — not a plugin, not an extension, a full standalone application that replaces Chrome or Safari if you choose to switch. It's built on Chromium, the same open-source engine behind Chrome, so it looks and behaves like a normal browser at first glance: address bar, tabs, bookmarks, extensions. The difference is a persistent AI sidebar that can read whatever page you're on, answer questions about it, summarize it, and — in its agent mode — take actions like comparing prices or filling out forms on your behalf.

It launched in mid-2025 as an invite-only product locked behind Perplexity's expensive Max plan, then widened access step by step until it went fully free worldwide. If you've been putting off trying it because you assumed it still cost something, that's no longer the case.

Where it differs most from typing questions into a separate chatbot tab: context. A normal AI chatbot only knows what you tell it — you have to copy and paste the article, describe the page, or explain what you're looking at. Comet's sidebar already sees the page you have open, so asking it to summarize, explain a confusing paragraph, or compare it to something you read earlier doesn't require any copy-pasting at all. That single difference — the assistant already knowing your context — is what most new users notice first, before they ever try agent mode.

How to Install and Set Up Comet

1. Download the installer. Go to Perplexity's official Comet page and download the app for your operating system. The file is small — typically under 20 MB — so it downloads in seconds on most connections.
2. Run the installer. Open the downloaded file and follow the on-screen prompts. On Mac you may need to approve it in System Settings → Privacy & Security; on Windows, right-click and choose "Run as Administrator" if it doesn't launch automatically.
3. Sign in or create a free Perplexity account. You'll need an account to use the AI sidebar, though the browser itself opens without one. Signing up takes under a minute with an email or existing Google account.
4. Import your existing browser data (optional). Comet will offer to import bookmarks, saved passwords, and history from Chrome or another Chromium-based browser, so you don't start from a blank slate.
5. Open the sidebar and ask it something. Click the assistant icon or use the keyboard shortcut to open the sidebar on any page, then try asking it to summarize what you're reading — it's the fastest way to see what makes Comet different from a normal browser.

One thing worth knowing before you start: cookies and active login sessions from your old browser never transfer, even when history and bookmarks do. You'll need to sign back into sites you use regularly — email, banking, social accounts — the first time you visit them in Comet. It's a minor inconvenience during the first day of use and not something to troubleshoot; it's simply how browser data migration works, in Comet and everywhere else.

The Features Worth Learning First

The sidebar assistant is the feature you'll reach for most as a beginner.

Comet answers with cited sources by default, the same habit carried over from Perplexity's search product.

A good first agent-mode task to try: ask Comet to open a few tabs comparing prices for something you're actually shopping for, then check its work against what you'd have found manually. It's low-stakes, gives you a clear sense of how accurate the assistant is, and doesn't touch anything sensitive — a much better starting point than jumping straight to filling out a form with personal information.

Start With Low-Stakes Tasks

Comet's agent mode is genuinely capable, but it's also the feature that's drawn the most security scrutiny of any AI browser in 2026 — researchers have repeatedly shown that hidden instructions on a malicious webpage can redirect what the agent does without you noticing. As a beginner, that's not a reason to avoid Comet, but it is a reason to build trust gradually: start with page summaries and research questions, move to comparing prices or organizing tabs, and hold off on connecting sensitive accounts like banking or email until you understand how it behaves.

A practical habit worth building from day one: watch what agent mode does instead of walking away while it works. Comet shows you its steps as it completes a task, and pausing or intervening mid-task is always an option. Treating it like a capable assistant you're supervising, rather than a tool you can hand something to and forget about, is the single best way to catch a mistake — whether that mistake comes from a genuine misunderstanding or a manipulated page — before it turns into a real problem.

It's also worth knowing what agent mode is not good at yet. Sites with unusual layouts, heavy JavaScript, or aggressive anti-bot measures can trip it up, and it sometimes needs a second, more specific instruction to finish a task correctly. None of that is unique to Comet — every agentic browser on the market in 2026 has similar gaps — but going in with realistic expectations saves the frustration of assuming a single vague instruction will always produce a perfect result.

What to Expect as a First-Time User

A Reasonable First AI Browser to Try

Frequently Asked Questions