Performance monitoring that does'nt cost you performance.
A ~5kb heartbeat for your web app. Capture Web Vitals, API latencies, and user environment data with zero overhead—enriched at the edge and built for the modern developer.
Lightweight Script (~5kb)
Our tracking script is optimized for performance. It wont affect your Lighthouse scores or LCP.
Core Web Vitals
Capture LCP, CLS, and INP from actual user sessions to see your site's true performance floor.
Request Interception
Automatically intercept fetch and XHR calls, capturing API latency, status codes, and payload sizes without manual instrumenting.
Geo & ISP Enrichment
Analyze performance by country, city, and ISP. Understand how global network conditions impact your app.
Integrated in 60 seconds.
No SDK required.
Stop wrestling with complex configurations. rum-core is a drop-in solution that works with any framework.
The Script
Add our ~5kb vanilla JS snippet to your <head>.
The Key
Provide your unique project API key.
The Insight
Get insights and analytics for events.
Simple, transparent pricing.
Scale your monitoring as you grow.