Cloudflare launches Kitesurf, a browser built for AI agents

Cloudflare has introduced Kitesurf, a cloud-hosted browser designed specifically for AI agents, making it the latest company to enter the browser market, though it targets developers rather than consumers. Unlike traditional browsers built for humans, Kitesurf does not focus on visual elements like themes, tabs, or extensions; instead, it manages context windows, performance, token costs, and scalability, and addresses threats like prompt injection attacks. With Kitesurf, AI developers can build software that navigates websites, fills out forms, and performs other browser-based tasks without building their own browser. The browser was built in 12 weeks, runs on Cloudflare's serverless Workers platform, and is free while in beta through Browser Run, which allows programmatic control of headless browsers. Cloudflare claims Kitesurf uses significantly less CPU and memory than Chromium for tasks like screenshots and HTML extraction, and it is built using technologies including Blitz's modular rendering engine, Firefox's Stylo CSS parser, and Boa JS, a Rust ECMAScript engine. The open source Rust headless engine Obscura inspired Kitesurf, with the proof of concept being a port of Obscura to Workers. Kitesurf passes over 215,000 web platform tests and renders pages like TodoMVC, Wikipedia, Hacker News, and the Cloudflare Blog.