Core Web Vitals from the lab and the field.
Synthetic lab runs and real-user CrUX data, side by side for every vital. When they diverge, that divergence is the diagnosis — and CheckVibe flags it for you.
Four steps. One pasted URL away.
- 01
Scan your site
A lab audit measures LCP, INP, CLS, and TTFB on your real pages — no tooling to install.
- 02
Field data joins automatically
Where Google has real-user CrUX data for your origin, it lands next to the lab numbers at p75.
- 03
Divergence gets flagged
Lab fast but users slow? Cache misses, device gap, or geography — the fused panel points at why.
- 04
Budgets watch your back
Set thresholds per vital and get alerted when a deploy pushes a metric over budget.
Built by people who shipped vibe-coded apps and broke them.
Real users, not just robots
CrUX field data reflects what your actual visitors experience across devices and networks.
Regression-first design
Every scan is compared against your history, so a slow deploy shows up as a delta, not a mystery.
Route-level lab audits
Vitals are measured on discovered routes — not just the homepage.
One score with your security
Performance sits in the same dashboard and report as security, SEO, and uptime. One place to look.
Check your vitals. Free until you find something.
Check your vitalsKeep exploring.
Paste any URL — production app, staging build, vibe-coded prototype.
One scan grades both halves of being found in 2026: classic search (SEO — 68 checks on indexability, metadata, structured data, content, and Core Web Vitals) and AI answer engines (AEO — 46 checks on whether ChatGPT, Claude, Perplexity, and Google AI can crawl, parse, and cite your site).
Every CheckVibe finding ships with a copy-paste prompt engineered for Claude, Cursor, and Windsurf — context, file paths, the exact diff.
Watch the traffic hitting your live app, classify suspicious patterns, and surface real threats — credential stuffing, scraping, prompt-injection probes — without flooding your inbox with noise.
Set a project up once.
Branded, executive-style PDFs and shareable dashboards for stakeholders, clients, and security reviewers — without writing a single sentence yourself.
Plug CheckVibe into Claude Desktop, Cursor, or any MCP-compatible client.
Cookie consent, privacy policy, terms, and GDPR signals — audited on your live site, tracked over time, and explained in plain language.
Automated WCAG 2.
SPF, DKIM, and DMARC graded in one pass — plus continuous DMARC report monitoring and blocklist checks, so deliverability problems surface before your users stop hearing from you.
Domain expiry, DNS hygiene, nameserver health, and TLS certificates — monitored continuously, with alerts long before anything bites.