Kitesurf: Cloudflare built a browser for agents in V8 isolates that uses 7x less memory than Chromium
Announced August 6, Kitesurf is a stateless browser running entirely on Workers — an Engine handling CDP WebSocket/REST and session state, a PageScript spinning up an isolated Dynamic Worker per page, and a Rust-based PageRenderer (Blitz, Stylo) returning pixels over RPC, with all network egress funneled through a single SandboxOutbound that enforces CORS. Against Chromium across 14 test URLs it used 4.7x less memory for screenshots and 7.0x less for HTML extraction, and 3.1x/3.8x less CPU respectively, while Chromium keeps a ~1.7x wall-time edge from JIT. It passes roughly 215,000 WPT tests, speaks CDP so Puppeteer and Playwright clients work unchanged, is free in beta through Browser Run, and Cloudflare says it intends to open-source it so customers can run their own instances.
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