Real User Monitoring
Know exactly how your users experience your website
Lab testing only tells part of the story. RUM captures performance data from every real visitor, revealing the actual experience across different devices, browsers, networks, and geographic locations. Catch performance regressions the moment they happen - not weeks later when your rankings drop.
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All your Core Web Vitals in one place
Track LCP, CLS, INP, FCP, and TTFB from real users. See trends, segment by device and location, and identify performance issues instantly.
RUM Monitoring
example.com
Lab tests look great, but users are complaining
Your Lighthouse score is 95+, yet users on mobile networks are bouncing. Lab tests run in controlled conditions - real users don't have that luxury.
Your 3G users in Southeast Asia have a completely different experience than your lab tests suggest
Performance regressions slip into production and go unnoticed for weeks
You can't reproduce the slow performance users are reporting
Google's Core Web Vitals assessment uses field data, not your lab tests
Third-party scripts behave differently in production than in testing
You're making optimization decisions based on incomplete data
What you can monitor
All Core Web Vitals
Track every metric that matters: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), CLS (Cumulative Layout Shift), FCP (First Contentful Paint), and TTFB (Time to First Byte). See exactly what Google sees.
Device & Browser Segmentation
Break down performance by device type (mobile, desktop, tablet), browser (Chrome, Safari, Firefox, Edge), and operating system. Identify which combinations cause issues.
Geographic Performance
See how performance varies by country. Identify if slow CDN nodes or regional network issues are affecting specific user groups.
Page-Level Insights
Don't settle for site-wide averages. Drill down to individual pages to find specific bottlenecks. Your checkout page might be fast while your product pages suffer.
Connection Type Analysis
Understand how your site performs on 3G, 4G, 5G, and WiFi connections. Many users are on slower connections than your testing environment simulates.
Historical Trends & Comparisons
Track performance over time with up to 36 months of data retention. Compare periods to measure the impact of deployments, optimizations, or third-party changes.
Percentile Distribution
See the full picture with p75 percentile - the same standard Google uses for Core Web Vitals assessment. Understand how 75% of your users experience your site.
Session-Level Analysis
When a user reports a problem, review their session data. See which pages they visited, performance metrics for each page view, and the device and network conditions they experienced.
Engagement Correlation
See how performance impacts user behavior. Correlate Core Web Vitals with scroll depth, bounce rate, clicks per session, and time on page to understand the real cost of slow performance.
Start collecting real user data in minutes
Add a lightweight script to your site
Copy and paste a single script tag into your HTML. At ~11KB gzipped, it won't impact your page performance. Works with any framework or CMS.
Real users start sending data immediately
As visitors browse your site, their Core Web Vitals are collected and sent to VitalSentinel. No sampling - you get data from every page view.
Analyze, segment, and compare
Use the dashboard to slice data by device, browser, location, and more. Set up alerts for performance regressions. Track improvements over time.
Get alerts when issues arise
Configure thresholds for each Core Web Vital. When real users start experiencing problems, you'll know immediately - not when your search rankings drop.
Add a lightweight script to your site
Copy and paste a single script tag into your HTML. At ~11KB gzipped, it won't impact your page performance. Works with any framework or CMS.
Real users start sending data immediately
As visitors browse your site, their Core Web Vitals are collected and sent to VitalSentinel. No sampling - you get data from every page view.
Analyze, segment, and compare
Use the dashboard to slice data by device, browser, location, and more. Set up alerts for performance regressions. Track improvements over time.
Get alerts when issues arise
Configure thresholds for each Core Web Vital. When real users start experiencing problems, you'll know immediately - not when your search rankings drop.
Problems we help you prevent
Get alerted before issues impact your users
Real scenarios, real solutions
"Conversion rates are down but you can't figure out why. Lab tests look fine."
RUM reveals that mobile users on slower connections are experiencing 4+ second LCP times, causing them to abandon before checkout loads.
"Google Search Console shows failing Core Web Vitals but you can't reproduce the issue."
RUM data shows which specific pages and user segments are failing, letting you prioritize fixes that will actually move the needle.
"After a deployment, users complain about slowness but your monitoring shows green."
RUM catches the regression immediately, showing exactly which metric degraded and on which pages, letting you hotfix before it impacts more users.
See your real user experience
Start collecting Core Web Vitals from actual visitors today. Our lightweight script won't slow you down.
Trusted by developers and SEO professionals worldwide