Is Comet browser safe to use?

Comet runs on Chromium, so it has the same base-level security as Chrome. The added risk is specific to its agent features: Brave's security team found that hidden instructions on a webpage (including in something as ordinary as a Reddit comment) could trick Comet's AI into taking actions the user never asked for, a class of attack called prompt injection. Perplexity has patched specific cases as they're reported, but the underlying risk category is not fully solved industry-wide. If you use Comet's agent mode for banking or anything with stored payment info, keep an eye on what permissions it's asking for.

Does Comet browser work on Windows?

Yes, Comet has run on both Windows and macOS since its original July 2025 launch. Android followed in November 2025 and iOS in March 2026, so it now covers desktop and mobile on both major platforms.

Comet browser vs Chrome: which one should I use?

Chrome is the safer default: near-zero learning curve, the full extension library, and Gemini is already built into a side panel for AI help. Comet is worth switching to specifically if you want the browser to complete multi-step tasks on its own, like comparing prices across five shopping sites or filling out a form from an email thread. If that's not a task you do often, Chrome plus Gemini covers most of what people actually want from an AI browser.

Comet browser vs Arc: what is the real difference?

They solve different problems. Arc was built around tab and workspace organization -- Spaces, a sidebar, split view -- with light AI features (summaries, tab renaming) bolted on. Comet is built around AI agency first: clicking, navigating, and completing tasks. The bigger issue with Arc specifically is that The Browser Company stopped building new features for it in May 2025 and moved the team to a new product, Dia. Arc still runs and gets security patches, but there's no roadmap.

What happened to Arc browser in 2026?

Arc is not shut down, but it's effectively finished as an actively developed product. The Browser Company stopped adding features in May 2025 and shifted its team to Dia. Atlassian bought The Browser Company for about $610 million in October 2025. Arc still receives Chromium security patches (the Mac build reached v1.147.1 in May 2026) but no new features and no public roadmap.

Is Dia browser only for Mac?

As of mid-2026, yes. Dia requires macOS 14 or later on Apple Silicon, with no Windows or Linux build available. If you use Windows, Dia is not an option regardless of how it compares on features. A dia browser vs arc browser matchup only matters at all if you are already on a Mac -- Windows users skip straight to Chrome or Comet.

How much RAM does Comet browser use?

Independent benchmarks put Comet at roughly 280-340MB of RAM in normal use, about 20-30% more than Chrome's 220-260MB for comparable tabs. When its AI agent features are actively running a multi-step task, memory use has been reported spiking past 1GB with just a handful of tabs open. If you're on an older laptop, that difference is noticeable.

Can Comet browser buy things for me?

It can walk through a checkout flow if you ask it to -- comparing prices across sites, adding items to a cart, and filling in shipping details. Reviewers who tested this report it works well for straightforward purchases but can misread a field or pick the wrong option on more complex, multi-step checkouts. Treat it as assisted shopping, not unattended shopping, and check the final order before it submits.

What is an agentic browser and why does it matter?

An agentic browser is one where the AI can take actions on your behalf inside pages, not just summarize or answer questions about them: clicking buttons, filling forms, navigating between sites. Comet, Chrome's Auto Browse, and Dia's assistant all fall into this category to different degrees. The tradeoff is real: more autonomy means more surface area for something to go wrong, whether that's a misread form field or, per Brave's research, a page instructing the AI to do something the user never asked it to.

Does Gemini in Chrome do the same thing as Comet?

Not yet, fully. Gemini in Chrome added a side panel assistant and, for Google AI Pro/Ultra subscribers in the US, an Auto Browse feature that can run multi-step tasks like researching flights across dates. It's rolling out in preview and isn't available to every Chrome user worldwide. Comet's agent features have been available more broadly for longer, which is the main practical gap between the two right now.

What are good Comet browser alternatives?

If you want AI features without switching browsers, use Gemini in Chrome or the Perplexity website/app inside whatever browser you already have. If you want a different agentic browser entirely, Dia is the closest comparison but is Mac-only. If agent features aren't the priority and you just want a well-organized browser, Arc still works, though it isn't receiving new features.

Back to Tools

5 AI browsers, 3 questions, 1 answer

Comet Browser Review: Which AI Browser Actually Fits You

This comet browser review starts from a simple fact: Comet is Perplexity's free, agentic browser - it clicks, fills forms, and compares prices across tabs. It is also one of five real choices right now, alongside Chrome, Arc, Dia, and just using Perplexity without switching browsers at all. Answer three questions below and the picker tells you which one actually fits, including the ones it rules out.

Updated July 5, 2026 - By Jim Liu(tracks AI browser and AI tool releases, cross-checked against vendor posts and independent benchmarks)

TL;DR - quick verdict

Comet is free worldwide as of October 2025 and is the deepest agentic option, but it uses more RAM than Chrome and carries the prompt-injection risks common to agentic browsers.
Chrome is the safest default - Gemini is already built in, and Auto Browse is rolling out for paid Google AI subscribers.
Arc still runs but stopped getting new features in May 2025; Dia (Arc's replacement) is Mac-only for now.
Perplexity without switching browsers is the lowest-commitment option if you just want cited answers.

Find your match: the interactive picker

Three questions, no sign-up. The picker eliminates whatever does not run on your OS first, then ranks the rest for your use case.

What do you mostly do

Your OS

Willing to pay for AI features?

Free onlyPaying is fine

Answer all three to see your pick.

Comet browser review: full feature and price comparison

The picker above turns these facts into a ranked recommendation. This table is the raw evidence behind it, including a "Best for" row so you can jump straight to your persona.

Feature	Comet	Chrome	Arc	Dia	Perplexity
Availability (July 2026)	Free worldwide since Oct 2025, all major platforms	Universal, has been for two decades	Still installs, receives security patches only	Mac (Apple Silicon) only, no Windows build	Works in any browser as a website or extension
RAM use (light session)	Roughly 280-340MB, more with agent tasks running	Roughly 220-260MB baseline	Similar to Chrome, Chromium-based	Not independently benchmarked yet	Whatever your existing browser already uses
Agent / automation depth	Deepest -- clicks, fills forms, compares prices across tabs	Auto Browse handles multi-step tasks, Pro/Ultra only, US preview	None -- Arc Max AI was summaries and tab naming, nothing agentic	Chat-driven assistant across your open SaaS tabs	None -- it answers questions, it does not act for you
Known security concerns	Brave disclosed prompt-injection risks in 2025; agent can be tricked by hidden page text	Standard Chrome sandboxing, no agentic attack surface yet outside preview	Standard Chromium security, no active development to patch new issues fast	Too new for independent security research to have caught up	Same as any search engine -- your queries go to Perplexity, no page-control risk
Best for	Shoppers and researchers who want tasks done, not just answered	Everyone who doesn't want to think about this decision	Existing Arc fans riding it out until something replaces it	Mac users in SaaS-heavy jobs (support, ops, sales)	Anyone who wants Perplexity's answers without a new browser
Not ideal for	Anyone who wants a lightweight browser -- it runs noticeably heavier than Chrome	People who want agent-first browsing today -- Chrome's agent mode is still a US-only preview	Anyone picking a browser for the next few years -- there is no roadmap left	Windows or Linux users -- Dia has no build for either as of mid-2026	Anyone who actually wants the browser to take actions for them, not just answer questions

Verified July 2026 from Perplexity's own release posts, Wikipedia's Comet browser entry, and the vendor blogs linked in the FAQ below. AI browsers change fast - recheck pricing before you commit.

Real-world reports: what reviewers found after testing Comet

We have not run Comet's full agent suite ourselves for this page, so instead of inventing quotes, here is what people who did publish, dated so you can judge how current it still is. The comet browser ram usage figures below come from independent benchmarks, not Perplexity's own marketing.

Oct 2025 - a week of daily use

Writer Naresh B A ran Comet as his main browser for a week and called the multi-site shopping comparisons genuinely impressive, but noted that AI-heavy tasks run slower than plain Chrome and that a shaky connection makes the agent feel unreliable, since it depends on the network far more than normal browsing does.

2025 - Brave security research

Brave's security team demonstrated that hidden instructions on an ordinary webpage, including inside a comment thread, could get Comet's agent to act on them without the user asking. This is prompt injection, and it is a category of risk shared by every browser adding agentic features, not a bug unique to Comet.

Benchmarked resource use

Independent testing puts Comet around 280 to 340MB of RAM in normal use, about a fifth to a third more than Chrome. With agent features actively running, memory has been reported spiking past 1GB on just a few tabs. On a newer machine you likely will not notice.

Real scenarios: who should pick what

Six situations run through the same picker above. Click a card to load those exact answers into the widget and see the full ranking, not just the winner.

Is Comet browser worth switching to?

This comet browser review keeps coming back to one split: Comet is the strongest pick for an ai browser for shopping and multi-tab research, while everyone else on this page wins on something Comet does not do as well yet, whether that is stability, OS coverage, or a lighter footprint.

Switch to Comet if

You regularly compare prices or options across several sites and want that automated
You are on Windows, Mac, Android, or iOS - the platforms Comet actually supports
You are comfortable with a browser account having read access to email or calendar for some tasks
You don't mind roughly 20-30% more RAM use than Chrome

Not ideal for: older or lower-RAM machines, or anyone who wants zero exposure to prompt-injection risk while agent features are still this new.

Stay on Chrome (or your current browser) if

You want AI help without changing browsers, extensions, or bookmarks
Gemini in Chrome or the Perplexity website already covers your question-answering needs
You are on Linux, where Comet, Arc, and Dia are not available at all
You would rather wait for agentic browsing to mature before granting account access

Not ideal for: anyone who specifically wants a browser to complete tasks end-to-end without them driving each step.

One caveat that applies across every agentic browser, not just Comet

The core agentic browser prompt injection risk - hidden instructions embedded in a webpage that an AI agent follows without the user asking - is an unsolved problem across the industry, not a Comet-only flaw. Brave's security researchers demonstrated it against Comet in 2025, and similar risks apply to Chrome's Auto Browse and Dia's assistant as they roll out further. Keep agent permissions scoped to what a task actually needs.

AI Model ComparisonCompare the models that power browsers like Comet and Chrome side by side on speed, context, and price.Windsurf vs Claude CodeA different kind of agentic tool decision - which AI coding assistant fits your dev workflow.Desktop AI Agent ComparatorComet is a browser-bound agent. See how desktop-level AI agents compare if you want automation beyond the browser.Perplexity Comet: Our Original Hands-On PreviewOur first look at Comet from its early waitlist phase, kept as a record of how far it has come since.

Frequently asked questions

Yes. Perplexity made Comet free for everyone in October 2025, after limiting it to Pro subscribers when it launched in July 2025. The free tier covers normal browsing and a limited number of agent tasks per day. Pro ($20/mo) and Max ($200/mo) remove those caps and add access to more underlying AI models.

Keep exploring

Curious how the models behind these browsers actually compare? See our AI model comparison , or if browser agents are not enough automation for you, look at our desktop AI agent comparator.