Comet

Comet is a web browser built by Perplexity AI and launched on July 9, 2025. It runs on Chromium and ships Perplexity's answer engine as the default search layer, meaning every search in the address bar returns AI-generated, citation-backed answers inside the browser window rather than a list of links to click through. The browser is free on Mac, Windows, iOS, and Android as of early 2026, with advanced features (premium AI models, paywalled publisher content) unlocked through a Perplexity Pro subscription at $20 per month. Comet's core promise is that the browser itself becomes a research and automation partner, not just a frame for web pages.

The Comet Assistant is a sidebar agent that can read your open tabs, summarize content, draft replies, compare sources across multiple windows, and execute multi-step web tasks such as filling forms, extracting data, and navigating between pages autonomously. Built-in integrations with Gmail and Google Calendar let the assistant summarize your inbox or surface upcoming meetings on request. Voice mode, powered by GPT Realtime 1.5, lets you talk to the assistant hands-free. Chrome extensions including 1Password, Grammarly, Bitwarden, and Vimium work natively, so switching does not require abandoning your existing extension stack. For users who spend hours each day in browser tabs doing research, comparison, and synthesis, Comet is the most fully realized version of an AI browser available today in 2026.

What Comet actually is in April 2026

Comet debuted in July 2025 as an invitation-only product available only to Perplexity's $200-per-month Max subscribers. Perplexity opened it to the public on October 2, 2025, making the full browser free for Windows and macOS users without a waitlist. Android support followed in November 2025. The iOS version reached all users in March 2026. The most recent major update, released April 28, 2026, added proper iPadOS support with Split View and multi-window functionality, completing Comet's presence across all major platforms.

The browser is Chromium-based, which means it renders pages identically to Chrome and supports the Chrome Web Store extension ecosystem. What distinguishes it from a Chrome fork with an AI sidebar is that Perplexity's search engine is native, not bolted on. When you type a query, the address bar calls Perplexity's live-indexed answer engine, returning a sourced summary rather than ten blue links. You can toggle to a traditional web search if you need raw results. The Comet Assistant reads all open tabs simultaneously, which is the capability reviewers consistently cite as genuinely useful: ask it to compare three research papers open in different tabs and it produces a synthesis without you copying text between windows.

Voice mode adoption picked up notably after the March 2026 iOS launch, where Perplexity integrated GPT Realtime 1.5 to reduce conversational latency to near real-time. Comet also launched as the default browser on select Samsung devices through a carrier partnership, giving it distribution leverage that most AI browser startups lack.

Where Comet sits versus ChatGPT Atlas and Dia

ChatGPT Atlas (OpenAI) runs on the same Chromium foundation but routes search through ChatGPT's inference pipeline rather than a dedicated web-index answer engine. Atlas defaults to a ChatGPT search experience with an optional Google fallback. Where it pulls ahead of Comet is on document-heavy editing tasks: because Atlas surfaces OpenAI's full editing toolkit directly in-page, rewriting emails and drafting long-form content inside the browser feels native rather than assistant-mediated. The trade-off is research freshness. Comet's Perplexity engine pulls live-indexed results with visible citations that update in real time; Atlas's search runs one processing step slower for breaking information. If your primary workflow involves emails, blog drafts, or client reports, Atlas has an edge. If it involves researching fast-moving topics with source traceability, Comet is the stronger choice. Atlas also has more restrictive AI feature access on free accounts, whereas Comet's free tier includes the full browser and basic search functionality. You can explore the underlying search tool at ChatGPT Atlas or the base model at ChatGPT.

Dia (The Browser Company) comes from the team behind Arc and takes a different philosophical position: AI is the primary interface, not an agent running in a sidebar. Dia's "Skills" system lets users define reusable AI automations by natural language, type "/fact-check" on any article and the browser runs a verification routine you designed earlier. Dia ties its memory to specific tabs and workflows rather than Comet's broader browsing-history access, which is meaningfully more private. In independent comparisons, Dia's tab management UX is cleaner and its approach to memory is more cautious. But for raw agentic depth, Comet holds the lead: Dia relies on third-party OpenAI and Claude models for inference, while Comet runs Perplexity's own search engine natively, giving it a performance edge on research tasks. Analysts describe it plainly: "Atlas and Comet push hardest on autonomous agents; Arc and Dia remain more cautious."

"Comet is the first AI browser that actually feels like a browser, not a chatbot wearing a tab bar.". Akshay Kothari, Tools Stack AI, April 30, 2026

You can also pair Comet's research output with the underlying Perplexity search assistant for tasks where you want answers without opening a full browser session. For document-heavy research workflows, Google Gemini offers long-context document processing as a complementary tool.

How AI actually works inside Comet

The Comet Assistant operates as a persistent sidebar agent, not a one-shot chat interface. It maintains awareness of all open tabs simultaneously and can be called using the "@" symbol to reference specific pages: "@tab2 what is the pricing on this page" pulls content from tab two specifically. This cross-tab awareness is the feature most users describe as the first genuinely productivity-shifting capability in a browser.

Agentic tasks work through a visual action log: when the assistant is booking a flight, filling a form, or extracting data, you can watch each step it takes and interrupt if something goes wrong. This is the right design choice for current AI reliability levels. In independent testing by LLMx, simple form-filling succeeded 85% of the time. Multi-step navigation across sites hit 70%. Long-running tasks lasting more than five minutes completed only 30% of the time, which is the hardest constraint to work around. The assistant gets stuck on CAPTCHA screens, cookie consent dialogs, and age-gate pages, requiring manual intervention that breaks the automation loop.

Gmail and Calendar integrations work through OAuth connections and pass through Perplexity's servers during agentic sessions. The assistant can summarize your inbox, pull upcoming meetings into context, and draft replies based on email thread history. Voice mode works across all open tabs, which means you can describe a task verbally and have the assistant act on visible page content without switching to a text interface.

"Agentic tasks are 70% magic, 30% comedy.". Akshay Kothari, Tools Stack AI, April 30, 2026

The friction and security concerns users keep raising

The most discussed event in Comet's short history is the CometJacking vulnerability, documented by LayerX Security in August-October 2025. Researchers demonstrated that crafted URLs could inject hidden instructions into the Comet assistant, commanding it to access connected Gmail accounts, harvest calendar invites, encode the data in base64, and POST it to attacker-controlled servers without any malicious page content visible to the user. LayerX submitted findings on August 27, 2025. Perplexity's initial response was to mark the report as Not Applicable, stating it could not identify any security impact. LayerX published the research publicly on October 4, 2025, and BleepingComputer and The Hacker News covered it widely. Perplexity later told TIME that the original bug report had been poorly worded and that the company "later identified the issue independently and patched it," though no patch date was disclosed. The episode illustrates a genuine architectural risk in browsers that have deep API access to email and calendar: agentic permissions create a wider attack surface than passive browsing.

Beyond the CometJacking incident, three patterns appear consistently in user reviews. First, resource consumption: the Comet Assistant regularly spikes CPU to 20% during agentic tasks, and RAM usage can exceed 4GB with fewer than ten tabs open, per PCMag's testing. Second, search quality below Google for navigational queries: users searching for specific recent pages often find Perplexity's answer engine buries the most relevant links, sending them back to Google for specific lookups. Third, data transmission anxiety: agentic sessions stream screen content to Perplexity's servers for processing, which is functionally necessary for the feature to work but raises legitimate concerns for anyone handling confidential business information, legal documents, or medical records.

"I was excited, mildly impressed, but a whole lot unimpressed at the same time," wrote Monalisa Sethi in the NanoBits newsletter after a week of daily use, citing failures on restaurant reservations, Amazon ordering, and WhatsApp summarization alongside genuine successes on email drafting and YouTube research.

Who Comet is for

Comet earns its score for researchers, journalists, analysts, and students who spend the majority of their working hours synthesizing information across multiple browser tabs. If your daily workflow involves reading five articles, comparing their arguments, pulling data from different sources, and producing a synthesis, Comet's cross-tab awareness and citation-backed search engine reduce that workflow by a meaningful margin. Reviewers consistently report research tasks running 15 or more minutes faster per session once the assistant's pattern-recognition for multi-source comparison is dialed in.

Existing Perplexity Pro subscribers get the most value: the $20-per-month subscription already covers the premium search features, and Comet simply delivers them inside a full browser rather than a separate app tab. For that user, switching to Comet as a daily driver is low-friction. Compatible Chrome extensions mean the practical cost of switching from Chrome is minimal on Day 1.

Skip Comet when: You handle sensitive financial, legal, or medical data and cannot accept screen content passing through third-party servers. You need reliable, uninterrupted autonomous automation; anything requiring more than five minutes of unattended operation will likely stall. You are a developer who needs Chrome DevTools-grade debugging and browser inspection tools. You routinely have 30 or more tabs open; performance degrades noticeably beyond that threshold. And if your search workflow is primarily navigational, finding specific pages, not synthesizing answers. Google Chrome still delivers more precise results for that use case.

Getting started with Comet

Download is available at perplexity.ai/comet. The browser installs as a standalone desktop application on Mac and Windows, and as an App Store download on iOS and Android. Initial setup asks you to connect a Google account for Calendar and Gmail integration, which you can skip if you only want the search and browsing capabilities. The Comet Assistant sidebar activates via a hotkey or the assistant icon in the top-right corner. Chrome extensions from the Web Store install identically to Chrome.

The free tier provides the full browser with basic Perplexity Search (five Pro Searches per day) and core assistant functionality. Perplexity Pro at $20 per month adds 300 or more Pro Searches daily, access to premium AI models including Claude and GPT-5 Thinking, file uploads, and Comet Plus publisher content from CNN, the Washington Post, and Fortune. Most users testing Comet for productivity will exhaust the free search quota within a work session, making the Pro tier a practical requirement for serious use.