Comet Browser by Perplexity: Hands-On Review (2026)

Perplexity spent most of 2025 treating Comet like a velvet-rope nightclub. The browser launched in July 2025 locked behind the $200-a-month Max tier, then quietly went free in October, then landed on Android, then finally arrived on iPhone in March 2026. Today it is free, cross-platform, and aimed squarely at the tab you keep open all day.

So the gate is gone. The harder question is whether you should walk through it. Comet is one of the more capable AI browsers shipping right now, but “capable” and “trustworthy” are not the same thing, and the gap between them is where this review lives. Here is what Comet actually does, what it costs, where its agent earns its keep, and the security caveats that should make you think twice before pointing it at your bank.

What Comet actually is

Comet is Perplexity’s attempt to fold its answer engine directly into the browser instead of making you visit perplexity.ai. It is built on Chromium using the Blink rendering engine, which is the same foundation as Google Chrome and Microsoft Edge. Practically, that means Chrome extensions install, your bookmarks import, and most sites behave exactly as they do in Chrome.

What’s bolted on top is the interesting part. A persistent sidebar assistant can see your open tabs, answer questions about the page you’re reading, summarize content, and run multi-step “agent” tasks like comparing prices across sites or filling out a form. Perplexity calls this the Comet Assistant. The pitch is that the browser stops being a passive window onto the web and starts acting on your behalf.

The three things it does well

The assistant earns its place in three modes. Built-in answers: highlight anything, or hit the address bar, and you get a cited Perplexity answer instead of a list of blue links. Page and cross-tab context: ask “compare these two pricing pages” with both tabs open and it reads them directly rather than making you copy-paste. Agentic tasks: hand it a goal like “find a summary of this video” or “compare flight prices to Tokyo next month” and it navigates, clicks, and extracts on its own.

Quality-of-life touches round it out: built-in ad blocking (powered by community-maintained, open-source filter lists), a low-latency voice mode running on OpenAI’s GPT Realtime model for natural back-and-forth, and slash shortcuts like /tldr and /cite baked into the assistant.

How it compares to Chrome, Edge, and a side-loaded extension

The honest framing is that Comet is not competing with raw Chrome. It is competing with Chrome plus the Perplexity extension, plus whatever AI sidebar you’ve already installed. The difference is integration depth and how hard it leans into autonomy.

Against Chrome itself, Comet matches the extension ecosystem and DevTools because it inherits them from Chromium, with one caveat reviewers flagged: under heavy load (think 30-plus tabs) Comet got noticeably slower than Chrome and its memory use climbed faster, and the assistant’s CPU and memory footprint grows further once it starts running automation jobs. If you live in tab sprawl, that matters. Against the Perplexity website or extension, Comet’s advantage is that the assistant has standing context across every tab rather than just the one in front of you, which is what makes the cross-tab summaries feel less like a gimmick. If your interest is the broader category of standalone AI assistants rather than a whole browser, our roundup of 25 free AI tools for 2026 covers options you can bolt onto whatever browser you already use.

The other obvious comparison is to OpenAI’s ChatGPT Atlas and Google’s Auto Browse in Chrome, which both shipped agentic modes. The differentiator in Comet’s favor, as of mid-2026, is that it is the rare AI browser that is both fully free and fully cross-platform. Atlas gates its agent behind ChatGPT Plus, Pro, or Business, and Chrome’s Auto Browse is a Premium-only feature.

Pricing and availability in 2026

This is where Comet got dramatically more interesting. The core browser and assistant are free on macOS, Windows, Android, and iOS. You can download it and use built-in answers, summaries, ad blocking, voice mode, and a limited allotment of agent credits without paying anything.

The model lineup is the main reason to upgrade. Pro unlocks frontier models that, as of mid-2026, include GPT-5.4, Gemini 3.1 Pro, Claude Sonnet 4.6, Kimi K2.5 Thinking, Nvidia’s Nemotron 3 Super, and Perplexity’s own Sonar. Max adds heavier reasoning models plus Model Council, a feature that fires your query at several top models at once and synthesizes the answers. Comet Plus, the $5 add-on, buys full-text access to walled-garden publishers (Condé Nast titles like Wired and The New Yorker, the Washington Post, Fortune, and other outlets) inside the assistant’s answers; it’s bundled into Pro and Max, so you only pay it separately if you’re otherwise on the free tier.

If you’re weighing the subscription mainly for the underlying answer engine rather than the browser shell, our Perplexity Pro review for 2026 breaks down whether the $20 tier justifies itself on search quality alone.

Living with the agent: what holds up and what doesn’t

Agentic browsing is the feature everyone wants to talk about, so here’s the unvarnished version from extended hands-on use. One reviewer who ran Comet as a daily driver for two weeks summed up the agent as “70% magic, 30% comedy,” and that tracks with the broader pattern in independent testing.

The wins are real. Research is where Comet clearly saves time: rather than juggling tabs and pasting into a separate window, the assistant reads your open pages and pulls citations directly, which one tester clocked at roughly 15 minutes saved per research session. Form-filling and price comparisons across sites worked reliably. Voice commands for “summarize this page” felt conversational rather than clunky.

The failures are equally real. On multi-step tasks the agent sometimes clicked the wrong button and then kept clicking, looped without finishing, or misread an instruction and confidently did the wrong thing. Reviewers also reported occasional crashes during heavy multi-tab agentic work, particularly with media-heavy pages open. And for anything involving payment, Comet deliberately stops short: it will line up a flight or a cart but won’t complete the final purchase without you reviewing and authorizing it. That’s a sensible guardrail, not a bug, but it means “book me a flight” is really “get me to the checkout.”

The privacy and security reality

This section is not optional reading. An assistant that can see every tab and act on your behalf is, by design, a high-value target, and researchers have already proven the point.

In August 2025, Brave’s security team disclosed an indirect prompt-injection flaw: because Comet fed page content to its model without cleanly separating the user’s instructions from the webpage’s text, attackers could hide commands in a page (white-on-white text, HTML comments, text inside images) that the assistant would execute when you asked it to “summarize this page.” Around the same time, LayerX detailed a related attack they branded CometJacking, where a single crafted URL could coax the assistant into reading connected data like email and calendar, base64-encoding it, and shipping it to an attacker’s server. In October 2025, Brave followed up with “unseeable” prompt injections hidden in screenshots that affected Comet and other AI browsers. Perplexity has shipped mitigations, but the underlying issue (untrusted web content and trusted user intent flowing into the same model) is a category-wide problem, not a one-off bug.

The takeaway isn’t “never use it.” It’s to scope what you let the agent touch. If you handle health, legal, or financial data, the practical advice from testers is to keep that work in a separate, non-AI browser session. Treat Comet’s agent like a capable but gullible assistant: useful for low-stakes navigation and research, not for anything where a malicious page could turn its helpfulness against you.

There’s a legal wrinkle worth knowing too. Amazon sued Perplexity in November 2025 over Comet’s automated shopping, and in March 2026 U.S. District Judge Maxine M. Chesney in San Francisco granted a preliminary injunction blocking Comet’s agent from logging into password-protected areas of Amazon, finding Amazon likely to prevail under the Computer Fraud and Abuse Act and California’s computer-fraud statute. Perplexity appealed, and the Ninth Circuit stayed the injunction within weeks, so as of mid-2026 Comet’s shopping agent is operating on Amazon again while the appeal plays out. The court heard oral arguments on June 11, 2026, and a ruling is still pending. In other words, the legality of agentic shopping on the biggest store on the internet is genuinely unsettled, even if the feature is live again for now.

Who Comet is actually for

Comet is a strong pick if you treat your browser as a workspace and spend your day reading, comparing, and synthesizing: researchers, writers, analysts, founders, and students get the most out of it, because the built-in answers and cross-tab context attack exactly that busywork. It’s a reasonable free download for anyone curious about agentic browsing who wants to kick the tires without a subscription.

It’s a weaker fit if you run dozens of tabs and care about performance, if you do sensitive work that you’d rather not expose to an AI with full tab visibility, or if you specifically want a hands-off shopping agent today. And if your real goal is AI help with code rather than general browsing, a dedicated tool will serve you far better than any browser sidebar; our guide to the best AI coding assistants is the place to start there.

FAQ

Is Comet browser free in 2026?

Yes. Perplexity removed the paywall on October 2, 2025, and the core browser and assistant are free on macOS, Windows, Android, and iOS. Premium AI models, higher search limits, and autonomous background agents require Perplexity Pro ($20/mo) or Max ($200/mo).

What is Comet browser built on?

Comet is built on Chromium using the Blink rendering engine, the same foundation as Google Chrome and Microsoft Edge. That means Chrome extensions, bookmarks, and most site behavior carry over directly, with an AI assistant layered on top.

Is Comet browser safe to use?

It’s safe for everyday browsing, but its AI assistant has documented prompt-injection vulnerabilities disclosed by Brave and LayerX in 2025. Because the assistant can read all your open tabs, security researchers recommend keeping sensitive health, legal, or financial work in a separate browser and not letting the agent act on untrusted pages.

How is Comet different from the Perplexity website?

The Perplexity website answers one question at a time in its own tab. Comet embeds that same answer engine into the browser itself, so the assistant has context across all your open tabs and can take actions like filling forms or comparing pages without you copy-pasting anything.

Can Comet’s AI agent buy things for me?

It can navigate to checkout and assemble a cart, but it deliberately stops short of completing payment without your review and authorization. Its autonomous shopping on Amazon has also been the subject of a 2026 court fight: a preliminary injunction briefly blocked it before the Ninth Circuit stayed that order pending appeal, so the feature is currently live on Amazon but legally contested.

How does Comet compare to ChatGPT Atlas and Chrome’s Gemini?

All three are Chromium-based browsers with agentic features. Comet’s edge in mid-2026 is that it’s both fully free and available on all four major platforms, whereas Atlas gates its agent behind a ChatGPT subscription and Chrome’s Auto Browse is a Premium-only feature.

What AI models can I use in Comet?

On the paid tiers, as of mid-2026 Comet exposes frontier models including GPT-5.4, Gemini 3.1 Pro, Claude Sonnet 4.6, Kimi K2.5 Thinking, Nemotron 3 Super, and Perplexity’s Sonar. The Max tier adds a Model Council feature that runs a query through several top models at once and synthesizes the results.

Résultat

Comet is the most polished free AI browser you can install right now, and for research-heavy work it genuinely earns the screen space. The built-in answers and cross-tab summaries are the real draw; the agent is a fun, occasionally brilliant, frequently clumsy bonus that you shouldn’t rely on for anything that costs money or touches sensitive data. The prompt-injection track record and the unresolved Amazon litigation are not dealbreakers, but they are the reason to keep the assistant on a short leash.

Download it free, give it a serious 72 hours on your actual workflow, and decide based on how often the assistant saves you a step versus how often it makes you babysit it. For a lot of writers and analysts, that math now comes out in Comet’s favor. For everyone handling private data or running a hundred tabs, Chrome with a single AI sidebar is still the calmer choice.