TL;DRCloudflare launched Kitesurf, an agent-first browser on Workers. Uses 3-7x less CPU/memory than Chromium. Passes 215K+ WPT tests. Built in Rust/Wasm in 12 weeks. Free in beta via Browser Run. Will be open sourced.
Cloudflare built a browser from scratch for AI agents and launched it today as a free beta inside its Browser Run product. Kitesurf runs entirely on Cloudflare Workers, uses Rust compiled to WebAssembly, and strips out everything a human browser needs but an agent does not: tabs, extensions, themes, pixel-perfect rendering, and 60-fps scrolling. What remains is a lightweight engine optimised for the things agents actually care about, structured content extraction, screenshots, and isolation between sessions.
The performance numbers are the headline. On a 14-URL test corpus, Kitesurf used 3.1x less CPU for screenshots and 3.8x less for HTML extraction compared to Chromium. Memory consumption was 4.7x lower for screenshots and 7x lower for HTML extraction. Chromium is still faster on wall-clock time by about 1.7x because its JIT compiler outpaces a cold software renderer, but CPU and memory are what drive infrastructure bills. Lower resource usage means more concurrent agent sessions at lower cost.
