Perplexity Comet Review: The First AI Browser That Actually Feels Like a Browser
It's Chromium with an agent in the sidebar that knows your tabs, and after two months as my default it's earned its keep. The agent still takes wrong turns, and the data model is a real trade-off.
Comet is the first AI browser you can actually live in. The sidebar Assistant knows the tab you're on, pulls citations from open pages, and turns a five-tab research binge into one question. Agent mode is genuinely useful when you treat it as a planner (price comparisons, form fills, inbox triage) and genuinely dumb when you hand it a checkout flow and walk away. The pitch got a lot easier the day Perplexity killed the $200/month paywall and made it free on every major platform. It doesn't clear our 90 threshold, because the agent is still hit-or-miss and the ad-targeting data model is a real trade-off, but if you read and write for a living, Comet is the daily driver to beat. Install it, give it a week, and see if you miss Chrome.
I've run Comet as my default browser on Mac and iPhone for the last two months. Research-heavy days, actual shopping, calendar wrangling, and the kind of writing where I've got twelve tabs open and no idea which one had the thing I needed. So this isn't a launch-week flyby.
The pitch: Comet is a Chromium browser (same engine as Chrome) with an AI agent living natively in a sidebar that knows which tab you're on, holds context across the session, and can take action for you. Book the flight. Draft the reply. Compare prices across three open tabs. That last part is the whole game. Every other "AI browser" I've tried is a chatbot wearing a tab bar. Comet is a browser with an assistant that actually reads what you're reading.
Pros
- The sidebar Assistant knows the active tab and pulls cited answers from open pages, so a five-tab research binge collapses into one question instead of five copy-pastes into a separate chatbot
- It's genuinely free on every major platform (Mac, Windows, Android, and iOS) with no subscription required for core features, which was not true a year ago when this was a $200/month product
- Chromium under the hood means your Chrome extensions, bookmarks, passwords, and history import in a couple of minutes, so switching costs are basically nothing
- Agent mode is the only completely free agentic browsing you can get right now, and price comparisons across 2-5 sites and structured data extraction work reliably enough to save real time
- Cross-device sync between Mac, iPad, and iPhone actually works, and the iOS app hit #3 Overall on the US App Store within 48 hours of launch for a reason: it's not a phone-app-shoved-on-a-tablet job
Cons
- Agent mode fails often enough on complex multi-step flows that you can't trust it with anything you can't afford to redo. It's a planner, not an autopilot, and shopping cart automation is where it face-plants hardest
- The data trade-off is real. Perplexity's CEO has publicly said Comet lets the company build user profiles for ad targeting, and the model is structurally closer to Chrome's data collection than to a privacy-first browser
- The August 2025 CometJacking prompt-injection vulnerability (where a malicious page could exfiltrate Gmail and Calendar data) got patched, but it's a reminder that giving a browser agent read/write access to your accounts is a real security surface
- Not on Linux, and the free tier's agent credits are small enough that heavy Pro-model use will push you toward the $20/month Perplexity Pro plan faster than the marketing suggests
What it’s actually good at
The sidebar Assistant is the feature that changes how you use the browser. It lives in a sidebar, knows which tab you’re on, holds context across your session, and can act on your behalf. It navigates websites, clicks, scrolls, fills forms, and makes sequential decisions inside a workflow, not just suggests what you should do next. In practice: I’ve got a long technical doc open, I want to know where the new APIs are, I ask the sidebar, and it answers with citations from the page I’m already on. No copy-paste into a separate ChatGPT tab. No re-establishing context.
The compound effect is bigger than any single feature. Instead of opening five tabs, pasting URLs into a separate Perplexity window, and trying to remember which tab said what, the Assistant already knows what tab you’re on and can pull citations from any open page. Asked to summarize a long technical doc and point at the new APIs, it nailed it twice in a row in one reviewer’s testing. Time saved per session, easily 15 minutes. That’s about what I saw. The Assistant is not smarter than ChatGPT. It’s just faster to reach, because it’s already looking at what you’re looking at.
Agent mode is the part that will either sell you or annoy you. Documented use cases: booking flights, managing email (inbox summaries, drafting replies, scheduling based on thread content), filling forms from your profile data, comparing product prices across retailers, hunting for promo codes at checkout. When it works, it’s the closest thing to a personal assistant a $0 product has ever put on my machine. You type “compare the cheapest MacBook Air M3 prices across Amazon, Best Buy, and B&H Photo,” and Comet opens tabs, walks each site, pulls prices, and drops a comparison table into the sidebar. In hands-on testing this worked reliably for 2 to 5 sites and structured data like pricing or product specs. My rule after two months: use it as a planner for bounded, structured tasks. Do not walk away from it during checkout.
The model menu is the sleeper feature. Comet lets you pick which AI the browser uses. OpenAI, Anthropic, Meta, and others are all in the dropdown. On paid tiers it gets better fast: the Comet Agent is powered by Claude Sonnet 4.6 by default for Pro users, and Opus 4.6 for Max users. Being able to route the same sidebar to a different model per task, without leaving the browser, is a quiet superpower.
The extension story is the other thing worth flagging if you’re coming from Chrome. On the Mac, Comet is built on Google’s Chrome and looks and behaves like it, so you can import your Chrome extensions and bookmarks and be up in minutes. 1Password, uBlock, Grammarly, all of it. Installs from the Chrome Web Store, works fine. This is the part that finally made me stop opening Chrome as a backup.
Where it lets you down
Agent mode is not a finished product, and pretending otherwise would be doing you a disservice. The good runs are spectacular. The bad ones are the kind of slow-motion failure where the agent clicks the wrong button and then keeps clicking. It still does this often enough that you should not trust it with shopping cart automation. Reviews everywhere echo this. Mine too. Anything ambiguous, anything that needs a value judgment mid-flow, anything where the site’s UI changed since the model last saw it, those are the places you’ll watch it fail politely and confidently.
The data model is the other thing to go into with eyes open. Perplexity’s CEO said, publicly, on a TBPN podcast, that building a browser gives Perplexity the ability to “get data even outside the app to better understand you,” with plans to build user profiles for targeted advertising. A Tuta privacy analysis described the setup as structurally identical to Chrome’s data collection. If your reason for leaving Chrome was privacy from ad profiling, Comet isn’t the browser you want. Brave with Leo, or a tuned Firefox, will serve you better. If your reason for leaving Chrome was that the browser felt dumb, Comet is the upgrade.
Security has had one real bruise. LayerX Security researchers identified an attack vector they called CometJacking. The exploit could exfiltrate a user’s personal sensitive data to a remote server the attacker controlled. LayerX responsibly disclosed to Perplexity in August 2025. The good news: Comet now requires visual confirmation before executing sensitive actions (clicking “confirm” or “proceed”) rather than acting silently. Perplexity patched the issue after the disclosure and added the confirmation layer. Enterprise deployments get per-action controls set by admins, with security work done in partnership with CrowdStrike. Fine. The practical takeaway is the same as with any agentic tool: think hard about which accounts you’re granting it access to before you click the button.
The other real gap is Linux. Comet isn’t available on Linux as of April 2026. If that’s you, this review isn’t for you yet.
Should you pay for it?
Short version: no, and that’s the news. Perplexity opened Comet to the world for free after first launching it in limited release on July 9. Since then, millions had joined the waitlist, faster than they could ship it. Perplexity is making Comet free as competition heats up with rivals like Google, after initially launching Comet in July 2025 to Perplexity Max subscribers at $200 a month. The version I’ve been using, with the sidebar Assistant, cross-tab context, and free agent access, costs zero dollars. That is a genuinely different product from the one that shipped a year ago.
In late March 2026, Perplexity brought Comet to all iOS users. With that release, Comet is on every major platform: iOS, Android, Mac, and Windows. You can ask Comet for research or work help from anywhere in the world. That’s the whole ballgame. A year ago Comet was an aspirational $200/month product. Today it’s a free download on every device you own.
Where money starts to matter is if you lean on premium models all day. The ceiling shows up when you want things done autonomously. Agent tasks (form fills, purchases, email drafting, travel booking) burn credits, and the free tier’s allocation is small. You’ll also hit rate limits if you use the assistant hard. The free allowance is more “daily driver with some AI augmentation” than “replace all your research tools.” Perplexity Pro at $20/month gets you the Claude Sonnet 4.6-powered agent by default, higher limits, and Comet Plus (a bundle of premium news sources) thrown in. Max at $200/month is for people running agent flows all day who want Opus 4.6 doing the driving. For 90% of readers, free is the right answer. For the rest, Pro pays for itself the first week.
The bottom line
Comet is the first AI browser I’ve kept using after the novelty wore off. The sidebar Assistant genuinely changes how fast you can read and synthesize the web, agent mode is a legitimately useful planner for bounded tasks, and the price dropped from $200/month to free in the last twelve months without losing the features that made it interesting. The agent still takes wrong turns you have to catch, the ad-targeting data model is a real trade-off, and Linux users are out of luck for now. Those keep it out of Editors’ Choice territory. But if you read and write for a living and you’re still on vanilla Chrome, install Comet, give it a week, and see if you miss the old workflow. Most people won’t. It’s the AI browser to beat, and it earns its 87.