D/01
Core Web Vitals
LCP, CLS, INP measured on real pages with expected impact deltas per fix.
PERF · SPEED→
Scanning · Core Web Vitals · SEO · A11y
v2026.04 · Realtime audit
See exactly
why your site
is slow.
VitalsLens audits Core Web Vitals, technical SEO, on-page SEO, and accessibility — then hands you a prioritised, code-level fix list with expected LCP, CLS, and INP impact.
LCPCLSINPTTFBFCPTBTSEOA11y
Live · audit.yoursite.com
12s ago78
2.1s
LCP
△ Work
92
0.04
CLS
✓ Good
65
180ms
INP
✕ Poor
88
0.8s
TTFB
✓ Good
Overall · 8117 fixes queued →
Spectrum covers every metric
§ 01 · The signal
Every metric Google
measures.
Every fix you need.
Not a generic score. Not a 40-point PDF. A prioritised, commit-ready fix list keyed to the exact file, line, and expected metric delta.
LCP
< 2.5sLargest Contentful Paint — how fast main content loads for the user.
CLS
< 0.1Cumulative Layout Shift — visual stability while the page paints.
INP
< 200msInteraction to Next Paint — responsiveness under real user input.
TTFB
< 0.8sTime to First Byte — server response and edge-cache performance.
§ 02 · Coverage
What we audit.
All at once.
Six audit domains in one pass. Cross-referenced, deduplicated, and ranked by expected business impact.
D/02
Technical SEO
Meta, canonical, robots, sitemaps, internal links, crawl depth — all audited.
CRAWL · INDEX→
D/03
Schema markup
Validates structured data and flags missing schema for rich-result content.
SEO · RICH→
D/04
Accessibility
WCAG 2.2 compliance checks with per-element recommendations — not just a score.
A11Y · WCAG→
D/05
Asset hygiene
Oversized images, render-blocking scripts, unused CSS, and poor font loading.
BUNDLE · IMG→
D/06
Regression tracking
Commit-by-commit monitoring with alerts when a PR degrades your metrics.
CI · MONITOR→
§ 03 · Continuous
Audit once.
Monitor forever.
Scheduled audits across staging and production. Regressions tracked commit-by-commit. Meta-tag mistakes flagged before they ship.
Explore all features →origin/main · vitalslens monitor
a3f2b1cfeat: add hero image lazy loadingLCP ↓ 280ms
9e4d2a8fix: update hero background imageLCP ↑ 340ms
b71f3c9chore: upgrade Next.js 14.2INP ↓ 45ms
c2a0e5ffeat: implement ISR for blog postsTTFB ↑ 90ms
d580a4bperf: remove unused Tailwind classesCLS → 0.02
4 commits · 1 regression caught
all clear →Stop guessing.
Start fixing.
Point VitalsLens at your site. Get a prioritised, code-level fix list in under 60 seconds.
Get Early Access →60-second first audit · Free core scan · Commit-integrated monitoring