Cloudflare's Real User Monitoring (RUM) / web analytics product. Available for free as a standalone product — does not require using Cloudflare's CDN. Measures core web vitals (LCP, INP, CLS) as experienced by actual visitors on real devices. Ryan Townsend is Principal Product Manager for this product as of March 2026 and recommends it as the first step when migrating an old SPA toward no-build (you can't optimize what you don't measure). Gets unique visibility because Cloudflare powers over 20% of the web.