Built for AI agents: Cloudflare launches Kitesurf

"Kitesurf is significantly more efficient in CPU and memory consumption than Chromium for common agentic tasks like screenshots and HTML extraction," the company said in a statement.

The company claimed it decided to build its own browser 12 weeks ago.

The company said it runs entirely on top of the company’s serverless platform, called Workers.

" Kitesurf is significantly more efficient in CPU and memory consumption than Chromium for common agentic tasks like screenshots and HTML extraction. What follows is the story of how we built it. Buckle up, it’s going to get technical — but we promise to keep it interesting," the company said in a statement.

Cloudflare has been working on providing great support for WebAssembly (Wasm) in Workers for quite some time.

"This is great because we can use high-performance C, C++, and Rust packages and compile them to Wasm. If we use Emscripten (for example) and its many layers of mocked dependencies, the compiled binary can get bulky and slow," the statement said.

The company said: " So we built this browser on the assumption that every page load is untrusted input and every session starts fresh. Each component is isolated and has access only to the resources strictly necessary for its function."

" This seems like a perfect fit for Cloudflare Workers, whose security model is built around isolation by design. But the platform only gets us the boundary between isolates. We still have to enforce the same principle at the application level, deciding what each component is allowed to touch and making sure nothing leaks across a page it shouldn't," it said.