Comet Browser Review 2026: Features, Safety & Verdict
Comet was one of the first AI browsers to reach a wide audience, built by Perplexity. Here's what it actually does, and a real security concern worth knowing before you make it your daily browser.
Last checked: September 2026
What Comet actually does
Launched in July 2025 by Perplexity, Comet is a Chromium-based browser with an AI assistant built directly into the interface, capable of summarizing the page you're on, answering questions about its content, and performing some multi-step tasks on your behalf without switching tabs or tools. It expanded to Android and iPhone in subsequent months, and competes with other AI-native browsers like OpenAI's ChatGPT Atlas.
A real security concern worth knowing
Security researchers at LayerX documented a vulnerability nicknamed "CometJacking" in 2026, a form of prompt injection where a specially crafted malicious link could potentially manipulate Comet's AI assistant into taking actions the user didn't intend. This isn't a Comet-specific flaw so much as a documented risk category across AI browsers generally, giving an AI assistant the ability to act on your behalf inside a browser creates a new kind of attack surface that traditional browsers don't have. It's a genuine reason for caution, particularly around clicking unfamiliar links while the AI assistant is actively engaged, not a reason to dismiss the product outright.
Who it's actually built for
Comet is strongest for people who already use Perplexity for search and want that same AI-assisted research experience built into their everyday browsing, rather than switching between a search tool and a separate browser. If AI-assisted summarization and in-browser task automation aren't things you'd actually use regularly, a standard browser remains the simpler, lower-risk choice.
Pros and cons
| Pros | Cons |
|---|---|
| Genuinely useful AI summarization and in-browser assistance | Documented "CometJacking" prompt injection vulnerability |
| Available across desktop, Android, and iPhone | Newer product, less battle-tested than established browsers |
| Strong fit for existing Perplexity users | AI browsers as a category carry new, still-evolving security risks |
Our verdict
Comet delivers on its AI-assisted browsing pitch genuinely well, but the documented security research around prompt injection in AI browsers is a real factor, not a hypothetical one. If you adopt it, stay cautious about unfamiliar links while the AI assistant is active, the same instinct that protects you from phishing elsewhere applies here too.
Frequently asked questions
What is Comet?
An AI-powered browser from Perplexity with a built-in assistant that summarizes pages and performs tasks directly in the browser.
Is it safe to use?
Researchers documented a "CometJacking" prompt injection vulnerability in 2026, a real, publicly known concern across AI browsers as a category, worth factoring into how cautiously you click unfamiliar links.