10 Best Core Web Vitals Tools for Founders [2026 Updated]

1. PageSpeed Insights

• Type: Free
• URL: https://pagespeed.web.dev/
• Overview: Google's PageSpeed Insights provides lab-based Lighthouse audits plus field Core Web Vitals metrics from CrUX to show LCP, INP (or FID), and CLS scores and actionable diagnostics. It highlights specific render-blocking resources and offers prioritized recommendations to improve Core Web Vitals for a single URL.

2. Lighthouse

• Type: Free
• URL: https://developers.google.com/web/tools/lighthouse
• Overview: Lighthouse is an open-source automated auditing tool that runs lab tests to measure performance including metrics that map to Core Web Vitals, then generates detailed diagnostics and improvement suggestions. It can be run in Chrome DevTools, from the command line, or integrated into CI to catch regressions before deployment.

3. WebPageTest

• Type: Free
• URL: https://www.webpagetest.org
• Overview: WebPageTest performs advanced lab testing from multiple locations and browsers, providing filmstrips, LCP/CLS traces, interaction-to-next-paint analysis, and third-party breakdowns to diagnose Core Web Vitals issues. Its waterfall, visual progression, and trace-based metrics make root-cause analysis of LCP and layout shift straightforward.

4. GTmetrix

• Type: Paid
• URL: https://gtmetrix.com
• Overview: GTmetrix combines Lighthouse and Web Vitals reporting with timed tests, historical monitoring, and waterfall visualizations to track LCP, CLS, and INP across pages and over time. It offers alerts, scheduled tests, and recommendations tuned for web performance improvements that impact Core Web Vitals.

5. SpeedCurve

• Type: Paid
• URL: https://speedcurve.com
• Overview: SpeedCurve focuses on continuous monitoring of Core Web Vitals with both synthetic and RUM data, visual LCP frames, CLS diagnostics, and distribution charts to correlate UX metrics with business KPIs. It supports performance budgets, deployment annotations, and competitive benchmarking to prevent regressions.

6. Calibre

• Type: Paid
• URL: https://calibreapp.com
• Overview: Calibre offers Core Web Vitals monitoring using synthetic tests and CrUX-sourced field data, with dashboards, alerts, and pull-request checks to stop regressions before release. It surfaces actionable insights (LCP element identification, CLS causes, INP hotspots) and integrates with CI/CD and collaboration tools.

7. Dareboost

• Type: Paid
• URL: https://www.dareboost.com
• Overview: Dareboost analyzes page performance and provides Core Web Vitals-focused audits including LCP, CLS, and interaction responsiveness plus prioritized fixes and third-party impact analysis. It also offers monitoring, historical comparisons, and competitive benchmarking to guide optimizations.

8. Chrome UX Report (CrUX)

• Type: Free
• URL: https://developer.chrome.com/docs/crux
• Overview: The Chrome UX Report is Google's public dataset of real-user metrics that underpins Core Web Vitals field data; it provides origin- and URL-level LCP, INP/FID, and CLS distributions derived from real Chrome users. Teams use CrUX to validate lab findings against real-world user experience and to feed dashboards and custom analyses.

9. Google Search Console — Core Web Vitals report

• Type: Free
• URL: https://search.google.com/search-console
• Overview: The Core Web Vitals report in Google Search Console surfaces origin-level field statuses (Good / Needs improvement / Poor) for LCP, INP, and CLS across mobile and desktop and lists affected URL groups with diagnostics. It helps SEO and dev teams prioritize pages that impact search performance and shows trends over time.

10. New Relic Browser (Web Vitals monitoring)

• Type: Paid
• URL: https://newrelic.com
• Overview: New Relic Browser includes Core Web Vitals as built-in RUM metrics and offers dashboards to drill into page-level LCP, CLS, and INP, plus instrumentation to trace which resources and JS tasks cause regressions. It integrates with alerts and distributed tracing to connect front-end vitals to backend and deployment events.