For Web Developers
Catch performance regressions in hours, not after the deployment is long gone
Your Lighthouse score is 95, but users are complaining about slow performance. Sound familiar? VitalSentinel gives you real user monitoring data alongside synthetic testing, so you can see what's actually happening in production, catch regressions immediately, and prove that your optimizations work.
Everything in one dashboard
Stop jumping between tools. See your entire website health at a glance.
Lab tests pass. Production users are having a different experience
Lighthouse runs in an ideal environment. Your users don't. They're on slow networks, old devices, and across the world from your servers.
Lab testing shows perfect scores, but real users report completely different experiences
You can't reproduce the performance issues users are complaining about
It's impossible to tell if your optimizations actually made a difference in production
Performance regressions ship to production and go unnoticed for days or weeks
You don't know which specific pages, devices, or regions are having problems
Without production data, you're optimizing blind
Solutions for your daily challenges
Real User Monitoring (RUM)
Capture Core Web Vitals from every real visitor. See actual LCP, INP, CLS, and other metrics from production - not just lab conditions.
Deployment Tracking
Compare performance before and after deployments. See immediately if a release caused a regression. Correlate performance changes with specific commits.
Segmentation & Filtering
Drill down by device type, browser, network connection, geographic region, or specific pages. Find exactly where and why performance is degraded.
Synthetic + RUM Together
Run scheduled Lighthouse tests alongside real user data. Understand when lab results don't match production reality and investigate why.
Percentile Distribution
Your median might look fine while your p75 users have a terrible experience. See the full distribution to understand your worst-case scenarios.
Automated Regression Alerts
Get notified when performance degrades after deployments. Set thresholds for Core Web Vitals and get alerts when metrics exceed acceptable levels.
Why teams choose VitalSentinel
Debug faster with production data
Stop trying to reproduce issues locally. See exactly what happened for the users who complained, with full device and network context.
Catch regressions immediately
Know within hours - not weeks - when a deployment impacts performance. Roll back quickly or hotfix before it affects more users.
Prove your optimizations work
Show stakeholders real data proving that your performance work delivered measurable improvements in production, not just lab scores.
Prioritize with confidence
Focus optimization efforts on the pages, devices, and regions that actually matter for your users. Data-driven prioritization.
How developers use VitalSentinel
Add the RUM script
A single lightweight script (~11KB) captures Core Web Vitals from real users. Works with any framework. Takes minutes to integrate.
Set up synthetic monitoring
Configure scheduled Lighthouse tests for your key pages. Choose frequency and geographic locations. Results are stored automatically.
Set performance thresholds
Define acceptable ranges for Core Web Vitals. Get alerts when metrics exceed thresholds so you can catch regressions quickly.
Debug with real data
When issues arise, drill down by any dimension. Find the root cause with actual production data, not guesswork.
Add the RUM script
A single lightweight script (~11KB) captures Core Web Vitals from real users. Works with any framework. Takes minutes to integrate.
Set up synthetic monitoring
Configure scheduled Lighthouse tests for your key pages. Choose frequency and geographic locations. Results are stored automatically.
Set performance thresholds
Define acceptable ranges for Core Web Vitals. Get alerts when metrics exceed thresholds so you can catch regressions quickly.
Debug with real data
When issues arise, drill down by any dimension. Find the root cause with actual production data, not guesswork.
Tools built for your needs
Stop guessing. Start measuring.
Get production performance data alongside lab testing. Debug faster, ship with confidence.
Trusted by developers, SEO pros, and agencies who catch issues in hours, not weeks