ProjectsDecember 3, 2025next-cwv-monitor
Google's Core Web Vitals directly impact SEO rankings and user experience. Yet existing monitoring solutions are either expensive, lack deep Next.js integration, or don't provide route-level insights.
next-cwv-monitor is a free, self-hosted alternative purpose-built for Next.js developers. Built at Blazity, it captures real user performance data and correlates it with business events.
- Real User Monitoring - Capture LCP, INP, CLS, TTFB, and FCP from actual visitors
- Next.js Router Integration - Automatic route detection and normalization (/blog/[slug])
- Device Segmentation - Filter metrics by desktop vs. mobile
- Percentile Analysis - View p50, p75, p90, p95, p99 distributions
- Custom Events - Track business events and correlate with web vitals
- Page Views - Automatic tracking for conversion analysis
- Privacy-first - No cookies, no personal data, GDPR-compliant by design
- Lightweight SDK - Under 5 kB gzipped, zero impact on app performance
- Next.js 16 - Dashboard and monitoring UI
- ClickHouse - High-performance analytics database
- React - Interactive dashboard components
- TypeScript - Fully typed SDK and dashboard
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