Pricing

Pay per usage

Web Vitals Reporter

Measures Core Web Vitals (LCP, CLS, INP, FCP, TTFB) for any URL using a real Chromium browser. Returns Google pass/needs-improvement/poor classification per metric plus an overall A-F grade.

Pricing

Pay per usage

Rating

0.0

(0)

Developer

Coleton Patton

Actor stats

Bookmarked

Total users

Monthly active users

3 days ago

Last modified

What it does

Loads the URL in headless Chromium, injects Google's web-vitals library, simulates user scroll + mouse movement to trigger INP measurement, and returns a structured report.

Each metric is classified per Google's 2026 thresholds:

Metric	Good	Needs improvement	Poor
LCP	≤ 2.5 s	≤ 4.0 s	> 4.0 s
CLS	≤ 0.1	≤ 0.25	> 0.25
INP	≤ 200 ms	≤ 500 ms	> 500 ms
FCP	≤ 1.8 s	≤ 3.0 s	> 3.0 s
TTFB	≤ 0.8 s	≤ 1.8 s	> 1.8 s

Input

{ "url": "https://example.com" }

Batch mode:

{ "urls": ["https://a.com", "https://b.com"] }

Output

{
  "url": "https://example.com",
  "grade": "B",
  "percentage": 75,
  "lcp": 1850, "lcpStatus": "good",
  "cls": 0.08, "clsStatus": "good",
  "inp": 220, "inpStatus": "needs-improvement",
  "fcp": 1200, "fcpStatus": "good",
  "ttfb": 450, "ttfbStatus": "good",
  "measuredAt": "2026-06-17T04:30:00.000Z",
  "durationMs": 14500
}

Use cases

Performance CI — schedule a daily run against your production pages, alert if grade drops
Competitive analysis — measure your top 10 competitors weekly
Lead enrichment — find sites failing Web Vitals (they need a perf consultant)
SEO audits — Web Vitals is a Google ranking signal

Pricing model (when published)

Pay-per-result: $0.15 per URL measured. Each measurement takes ~15-20 seconds (real Chromium).

Why this instead of PageSpeed Insights API?

No quota cap — PSI is rate-limited; this Actor scales horizontally
Custom interactions — extend main.js to scroll a specific way, click a CTA, then measure post-interaction vitals
Includes TTFB and FCP — PSI only reports the Core 3
Real browser — no estimated lab metrics; field-style measurement on each run

Author note

Built by Peak Post — solo developer running 22 Chrome extensions. Ports the always-visible Web Vitals badge from the Web Vitals Lite Chrome extension into a programmatic API.

Roadmap

v1.1: throttling presets (slow 3G, fast 3G, no throttle)
v1.2: device emulation (mobile / desktop / tablet)
v1.3: filmstrip screenshots at LCP / FCP timestamps
v2.0: sitemap-aware batch with parallel browser pool

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