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Head-to-head · Core Web Vitals Monitoring Tools

Sentry Web Vitals vs GTmetrix

  • Updated Nov 2026
  • Both researched from official sources
  • 2 checks side by side
Higher score Sentry Web Vitals #1 in Core Web Vitals Monitoring Tools 9.3/10 Free plan · 14-day trial Free planFree trial✓ 1 of 3 features Visit Sentry
GTmetrix #2 in Core Web Vitals Monitoring Tools 9.1/10 Paid ✓ 0 of 3 features Visit GTmetrix

Sentry Web Vitals leads on 1 check, GTmetrix on 0, and 1 is even. Who comes out ahead on the 2 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSentry Web Vitals · 9.3/10
  • Free planonly Sentry Web Vitals
  • Free trialonly Sentry Web Vitals
  • Most featuresSentry Web Vitals · 1 of 3

Sentry Web Vitals scores higher on our rubric for core web vitals monitoring tools: 9.3 against 9.1 out of 10; our editors rank them #1 and #2.

Sentry Web Vitals offers free plan; GTmetrix doesn't.

Sentry Web Vitals is the better fit for teams needing production RUM and deep debugging. GTmetrix is the better fit for teams wanting synthetic and scheduled Web Vitals testing.

  • Sentry Web Vitals fits best

    Teams needing production RUM and deep debugging

  • GTmetrix fits best

    Teams wanting synthetic and scheduled Web Vitals testing

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Sentry Web Vitals 9.3/10 Visit ↗ GTmetrix 9.1/10 Visit ↗
At a glance
Editor score 9.3 9.1
Ranking #1 in Core Web Vitals Monitoring Tools #2 in Core Web Vitals Monitoring Tools
Best for Teams needing production RUM and deep debugging Teams wanting synthetic and scheduled Web Vitals testing
Pricing model Free plan + paid Paid
Starting price $26/mo —
Free plan ✓ (best) —
Free trial 14 days —
Deployment Cloud Cloud, Browser extension
Platforms Web Web
Support Email, Community Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Sentry Web Vitals 1/3 · GTmetrix 0/3
Real-user monitoring ✓ (best) Not checked yet
Synthetic monitoring Not checked yet Not checked yet
CI budget checks Not checked yet Not checked yet
Specs
Alert channels Email Not checked yet
Data retention 90 days Not checked yet
Synthetic test locations Not checked yet Not checked yet
Our review
Pros
  • Collects production LCP, INP and CLS in a weighted performance score
  • Span waterfalls help investigate expensive operations
  • Profiling and flame graphs trace slow loads to contributing functions
  • Lighthouse reports include Web Vitals and detailed waterfall charts.
  • Schedules, alerts and history support ongoing performance tracking.
  • Global locations, mobile simulation, REST API and MCP access.
Cons
  • Requires Sentry SDK configuration for browser apps and frameworks
  • The feature is presented within Sentry, not as a separately priced product
  • Advanced dashboards and SAML/SCIM support require Business
  • No perpetual free plan; access is paid after the free trial.
  • Monitoring frequency and capacity vary by plan.
  • Focused on page performance, not SSL, status-page, ping, DNS or keyword monitoring.
Our verdict

Sentry Web Vitals is a real-user performance monitoring feature for developers who need to understand page loading, interactivity and visual stability in production. Browser transactions provide LCP, INP and CLS measurements, which Sentry…

Read the review →

GTmetrix is a web-based website performance testing and monitoring platform for website owners, developers, marketers, agencies and teams of different sizes. It runs tests in real Chrome browsers from global locations, measuring Lighthouse…

Read the review →
  1. Sentry Web VitalsCore Web Vitals Monitoring Tools 9.3Free plan · 14-day trial
  2. GTmetrixCore Web Vitals Monitoring Tools 9.1Paid

Strengths and trade-offs

  • Sentry Web Vitals — where it wins

    • Collects production LCP, INP and CLS in a weighted performance score
    • Span waterfalls help investigate expensive operations
    • Profiling and flame graphs trace slow loads to contributing functions

    Where it doesn't

    • Requires Sentry SDK configuration for browser apps and frameworks
    • The feature is presented within Sentry, not as a separately priced product
    • Advanced dashboards and SAML/SCIM support require Business

  • GTmetrix — where it wins

    • Lighthouse reports include Web Vitals and detailed waterfall charts.
    • Schedules, alerts and history support ongoing performance tracking.
    • Global locations, mobile simulation, REST API and MCP access.

    Where it doesn't

    • No perpetual free plan; access is paid after the free trial.
    • Monitoring frequency and capacity vary by plan.
    • Focused on page performance, not SSL, status-page, ping, DNS or keyword monitoring.
  • Sentry Web Vitals9.3/10 · Free plan · 14-day trial

    Production browser metrics connect web vitals to trace and code-level debugging.

    Visit SentryFull verdict →
  • GTmetrix9.1/10 · Paid

    GTmetrix pairs real Chrome tests and Web Vitals reports with scheduled monitoring.

    Visit GTmetrixFull verdict →

More comparisons

All core web vitals monitoring tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

Last updated · How we research and update