Launched December 23, 2025.png?width=160)
Core Web Vitals Test
Check Core Web Vitals and compare metrics for desktop and mobile devices.
FreeAnalyticsMonitoringMarketing1,201 impressions#12 of its week
Test your website performance using our Chrome extension. Check Core Web Vitals and compare metrics for desktop and mobile devices. Optimize your website performance, improve user experience and achieve SEO goals.
✨ How to use this extension
1. 🛠️ Install the extension.
2. 🌐 Navigate to the web page you want to analyze.
3. 🖱️ Click on the extension icon.
4. 💻 The Core Web Vitals test will calculate metrics for desktop.
5. 📱 Click the "Mobile" button to calculate metrics for mobile devices.
6. 🔄 Click the "Desktop" or "Mobile" button to recalculate the metrics.
Core Web Vitals Test is a Chrome extension that measures and compares key performance metrics for desktop and mobile pages.
- for
- SEO specialists, web developers, UI/UX designers, digital marketers, product managers, QA engineers
- pricing
- free
Key features
6 features of Core Web Vitals Test
- Metric calculation — Shows LCP, CLS, INP, FCP, TTFB for the current page on desktop and mobile.
- One-click analysis — Calculate metrics by clicking the extension icon without leaving the page.
- Mobile/desktop toggle — Switch between mobile and desktop results instantly.
- Competitor comparison — View Core Web Vitals of any competitor page for SEO benchmarking.
- Real-time monitoring — Track performance changes as you develop or update a site.
- Multi-language UI — Interface available in 55 languages.
Use cases
- Check page performance before a release to catch LCP or CLS regressions
- Compare your site’s Core Web Vitals with a competitor’s to inform SEO strategy
- Validate that recent design changes didn’t degrade mobile responsiveness
Core Web Vitals Test vs alternatives
.png?width=64) Core Web Vitals Test |  Google Analytics |  Plausible |  Umami |  PostHog | |
|---|---|---|---|---|---|
| Best for | Instant Core Web Vitals metrics in Chrome | Comprehensive web and app analytics | Privacy-first web analytics | Lightweight, privacy-focused analytics | Product usage analytics |
| Pricing | Free | Free | Subscription | Free | Subscription |
| DevHunt upvotes | 1 | 0 | 0 | 0 | 0 |
| Launched | Dec 2025 | — | — | — | — |
- Core Web Vitals Test vs Google Analytics: Google Analytics provides broader traffic analytics but not instant Core Web Vitals per page in the browser
- Core Web Vitals Test vs Plausible: Plausible focuses on privacy-friendly site traffic stats, not real-time Core Web Vitals metrics
- Core Web Vitals Test vs Umami: Umami offers simple analytics without the built-in Core Web Vitals calculations of this extension
- Core Web Vitals Test vs PostHog: PostHog includes product analytics and session replay, not a Chrome-based Core Web Vitals checker
Core Web Vitals Test FAQ
Do I need a Google account to use the extension?+
No, the extension works directly in Chrome after installation.
Which Core Web Vitals does it measure?+
It reports LCP, CLS, INP, FCP, and TTFB.
Can I see metrics for both mobile and desktop?+
Yes, use the Mobile and Desktop buttons to toggle views.
Is any of my data collected?+
The developer states no data is collected or sold.
Does it work on any website?+
It calculates metrics for any page you navigate to, including competitor sites.
Summarized by DevHunt from chromewebstore.google.com · Oct 1, 2026. Details may change; check the official site.
