An AI browser is a browser with an agentic AI assistant built in. Where an ordinary browser just renders pages, an AI browser can understand the content, navigate between pages and perform tasks for you: compare products, fill in forms, book a trip or complete a purchase. It is no longer just a window onto the web — it is an agent acting on the web.
How they work
Most AI browsers are built on Chromium with an agent layer on top. The assistant sees what you see, but can reason across tabs, interpret the content and take actions step by step. You give a goal — "find the cheapest merino wool sweater with free shipping and add it to the cart" — and the agent navigates the pages, reads, chooses and acts. It is the same agentic logic behind Deep Research, but aimed at doing things on websites, not just reading them.
Who leads: Atlas, Comet — and Cite Browser
- OpenAI Atlas — launched October 2025, a Chromium-based browser with ChatGPT woven into every interaction. Strongest at task automation like booking and shopping across sites.
- Perplexity Comet — the first agentic browser to reach a broad audience. Perplexity dropped the paywall in March 2026, so the sidebar assistant, cross-tab reasoning and agent mode are now free on Mac, Windows, iOS and Android.
- Dia and Arc (The Browser Company) and Brave Leo compete for the same position.
- Cite Browser — CitationLab's own Chromium-based browser with a built-in Cite Score that measures how visible and citable the page you are on really is to AI models, as you browse.
The field is young and contested: Amazon sued Perplexity in November 2025 over how Comet's agent accessed password-protected pages — a reminder that the rules for agentic browsing are still taking shape.
What it changes for your website
The shift is fundamental: a growing share of the visits to your website are made by agents, not humans. An agent does not scroll, is not impressed by a beautiful hero section, and does not guess its way through an unclear menu. It reads the structure, follows the links and performs the actions — if the site is built so it can. Machine-readable content, clear entities, structured data, stable links and action flows an agent can complete become the difference between being used and being skipped.
How CitationLab makes your site agent-ready
CitationLab's Citation Sites are websites (built in Astro) made for exactly this: fast, structured and machine-readable, with schema, clear entities, llms.txt and agents.md, so both AI crawlers and agentic browsers understand, navigate and choose the pages. Want to know whether your website is ready for the agents already browsing? Start with a review of your AI visibility.
Frequently asked questions
What is an AI browser?
Which AI browsers exist in 2026?
What do AI browsers change for my website?
Is an AI browser the same as an AI crawler?
Definitions used in this article
- AI browser
- An AI browser is a browser with an agentic AI assistant built in that can navigate, read and perform tasks on websites on the user's behalf, instead of just displaying them. Examples are OpenAI Atlas, Perplexity Comet and CitationLab's Cite Browser.
- AI agent
- An AI agent is software that plans and executes multiple steps itself to reach a goal — for example navigating a website, comparing options and completing a purchase. In an AI browser, the agent is what actually visits and uses your pages.
- Cite Browser
- Cite Browser is CitationLab's own Chromium-based browser with a built-in Cite Score that measures how visible and citable any web page is to AI models like ChatGPT, Gemini, Claude and Perplexity — while you browse.