Inspector
The deepest technical SEO & web performance audit you can run on any URL
Inspector runs 130+ rules across technical SEO, Core Web Vitals, security, infrastructure, and availability – in parallel – so no issue stays hidden. Paste any public URL, pick mobile or desktop, and in under a minute you get a single 0-100 Inspector Score, detailed charts and waterfalls, raw data from every check, and a prioritized fix list written for engineers.
- Prioritized Issues Panel
- Inspector Score (0-100)
- Six Parallel Checks
- CrUX Field Data
The issues that hurt rankings and performance are the ones that hide best
Render-blocking scripts. Noindex tags added by JavaScript. Missing security headers. Expired certificates. Mixed content. Lighthouse alone won't catch them, and neither will your field-data dashboard. Inspector runs every check in parallel so nothing stays hidden.
Lighthouse reports miss server-side issues like SSL, WHOIS, and robots.txt
Field-data tools only show what real users already saw – never what Google might see on its next crawl
Technical SEO regressions (post-JS noindex flips, robots.txt blocks) hide behind clean-looking pages
Lab wins don't always show up in CrUX – and CrUX wins don't always hold up in the lab
Every extra tool means another tab, another login, another report to reconcile
Audit PDFs are useless when engineers need a one-line fix with evidence attached
130+ rules. 6 parallel data sources. One score.
Real-user CrUX (Chrome User Experience Report) data, a full Chrome lab audit, uptime, SSL, WHOIS, and robots.txt verdicts – every rule evaluated, every issue surfaced, every recommendation written for the team that will ship the fix.
Prioritized Issues Panel
130+ issue rules across performance, SEO, security, infrastructure, and availability – sorted by severity, base deduction, and estimated savings.
Inspector Score (0-100)
A single weighted score across five pillars: Performance (40), SEO (25), Security (20), Infrastructure (10), and Availability (5) – so you can see health at a glance and drill into any pillar.
Six Parallel Checks
CrUX field data, Chrome headless lab audit, uptime, SSL, WHOIS, and robots.txt – all run in parallel against any public URL.
CrUX Field Data
Real-user Core Web Vitals at the 75th percentile, pulled from Google Chrome over the last 28 days: LCP, INP, CLS, FCP, and TTFB for the device profile you select.
Chrome Lab Audit
Headless Chromium load that captures lab Core Web Vitals, rendering filmstrip, network waterfall, metadata, structured data, security headers, and console errors.
SSL & WHOIS
Certificate validity, issuer, TLS protocol version, and chain completeness alongside domain registrar, expiry, and TLD details.
robots.txt Analysis
Parses robots.txt to determine whether the URL is crawlable by search engines and AI bots like GPTBot and ClaudeBot.
Severity & Fatal Penalties
Critical, Warning, and Info tiers with diminishing-returns deductions. Fatal issues like expired SSL or noindex apply a cross-pillar 15% penalty – so a broken page can never earn an A.
Historical Comparison
Results are retained for 12 months. Re-run the same URL and see exactly which metrics and issues moved between inspections.
Any URL, No Domain Setup
Audit any URL on the public internet – competitors, staging, client prospects, or sites you don't own. No domain registration, no tracking script, no DNS verification required.
Mobile or Desktop
Pick the device profile that matches how your users (or Google) experience the page. Toggle and re-run in seconds.
Engineer-Ready Recommendations
Every issue comes with the raw evidence that triggered it, plus a recommendation that points to the subsystem to fix – written for the team that will ship the change.
Five pillars roll up into one Inspector Score
Inspector weights Performance, SEO, Security, Infrastructure, and Availability into a single 0-100 score, so one number tells you where the page stands and you can open any pillar for the detail behind it. Fatal issues like expired SSL or noindex apply a cross-pillar penalty, so a broken page can never earn an A.
- 0-100 score weighted across five pillars
- Drill from the headline number into any pillar
- Fatal issues trigger a cross-pillar 15% penalty
One weighted 0-100 score rolls up 130+ rules across five pillars, so page health is clear at a glance.
Every rule evaluated across all five pillars
Inspector runs 130+ rules across technical SEO, Core Web Vitals, security, infrastructure, and availability in parallel, then separates what passes from what needs a fix, pillar by pillar.
- 130+ checks spanning all five pillars
- Percentage and points scored for every pillar
- Issues sorted by severity and estimated savings
Critical failing checks, ranked with evidence
Inspector surfaces the issues single-tool audits miss – expired certificates, post-JS noindex flips, missing security headers, and robots.txt blocks – each ranked by severity with the raw triggering evidence attached. Every recommendation points engineers to the subsystem to fix.
- Critical, Warning, and Info severity tiers
- Raw triggering evidence attached to each issue
- Recommendations written for the team that ships
Paste a URL, get the verdict
Paste any public URL
No tracking script, no domain verification, no DNS changes. Works for competitors, staging environments, and client prospects – anything on the public internet.
Pick mobile or desktop
Choose the device profile that matches your audience. Inspector runs a fresh Chromium session against that profile.
Six checks run in parallel
CrUX, Chrome lab audit, uptime, SSL, WHOIS, and robots.txt all run at the same time, and they typically finish in under a minute.
Review score, charts, and issues
Get the 0-100 Inspector Score, pillar breakdowns, the network waterfall, the rendering filmstrip, and CrUX and lab metric charts. Then work through the prioritized issues panel, filtered by severity or category.
Real scenarios, real fixes
"A prospect asks you to audit their site before the first call – you need a defensible overview, not a 40-tab deep dive."
Run Inspector, screenshot the score and the top critical issues, and walk into the call with a concrete fix list.
"Staging is up and you want a sanity check before merging – but you don't want to wire monitoring to a URL that'll be gone next week."
Paste the staging URL into Inspector. Catch regressions, missing headers, or a broken robots.txt before the release goes live.
"A new lead wants to know how bad it is. You need an answer in minutes, with evidence they can't argue with."
Inspector produces a single Inspector Score plus a prioritized issues list – the kind of deliverable that turns a discovery call into a signed proposal.
"You suspect something changed after a recent deploy but you don't have time to dig through five dashboards."
Re-run Inspector on the impacted page. The 12-month history shows exactly which metrics or issues moved between runs.
Every module included. You only choose your coverage
All plans include every monitor and analytics module. Start free, upgrade only when you need wider coverage.
Free
Perfect for trying out VitalSentinel
- 1 domain
- 25K RUM page views/mo
- 100K analytics events/mo
- 6 months data retention
Lite
For consultants and growing businesses
- 5 domains
- 250K RUM page views/mo
- 5M analytics events/mo
- 16 months data retention
Uncover every issue on any URL in under a minute
The deepest technical SEO and web performance audit you can run on demand. No tracking script, no domain verification – paste any public URL and see every fixable issue, with evidence engineers can act on. Free plan includes 3 inspections every month.