Cloudflare has introduced Kitesurf, a cloud-hosted browser designed specifically for AI agents to navigate the web and complete tasks on behalf of users.

Unlike traditional browsers built for humans, Kitesurf ignores visual elements like themes, tabs, and extensions, focusing instead on context window management, performance, token costs, and scalability.

It also accounts for a different threat model, including prompt injection attacks. The browser runs entirely on Cloudflare‘s serverless platform, Workers, and was built in just 12 weeks.

It incorporates a modular rendering engine from Blitz, Firefox’s CSS parser Stylo, and the Rust ECMAScript engine Boa JS, with everything else running inside Workers.

Kitesurf is available for free while in beta under the name Browser Run, which allows developers to programmatically control headless browser instances on Cloudflare‘s network.

The company claims Kitesurf is significantly more efficient in CPU and memory consumption than Chromium for common agentic tasks like screenshots and HTML extraction, keeping operational costs down.

According to Cloudflare, Kitesurf already passes around 215,000+ web platform tests and is adding hundreds more each week.

The first proof of concept was a port of the open-source Rust headless engine Obscura to Workers.

Cloudflare notes that Kitesurf correctly renders pages like TodoMVC, Wikipedia, Hacker News, the Cloudflare Blog, and much of the Cloudflare dashboard.

The browser is early-stage and in beta, with the company acknowledging the challenging threat model for AI browsers.

Kitesurf does not aim to replace consumer browsers like Chrome but rather provides a purpose-built runtime for AI agents that can navigate websites, fill out forms, and complete browser-based tasks without developers needing to build their own browser software.