What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

census.gov

https://census.gov· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

census.gov

Mobile

Sponsored

Hosting Provider

National Oceanic and Atmospheric Administration

IP Address

148.129.75.166

Server Location

🇺🇸 Boulder, United States

ASN

AS7764

Organization

National Oceanic and Atmospheric Administration

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns2e.census.gov.ns1e.census.gov.

Performance

Page Speed

6.8 MB

89 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Technology Stack

10 Technologies Detected

Libraries

CSS Frameworks

Icon Libraries

Font Awesome Ionicons

Other

Other

CDN

Customer Support

SEO Analysis

C62/100

census.govcensus.gov

Census.gov | U.S. Census Bureau Homepage

The Census Bureau's mission is to serve as the nation's leading provider of quality data about its people and economy.

Title Length40 chars

Recommended: 50-60 chars

Description Length118 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (6/11)

4 issues found

Upgrade to view details

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

WAF

56d

Upgrade to view header details

HTTP Headers

Developer Console

date

Wed, 11 Feb 2026 00:22:52 GMT

content-type

text/html; charset=UTF-8

content-encoding

📦 Gzip(gzip)

set-cookie

HttpOnly

x-content-type-options

nosniff

content-security-policy

default-src 'self' 'unsafe-inline' 'unsafe-eval' mailto: dat...

Good Warning Issue

Typography & Readability

serif + sans-serif

23/100

Readability

/30

5/40

13px · LH 1.10

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

serif

Serif

Body Font

sans-serif

Sans13px

Contrast Ratio

Reading Comfort

~80 CPL

Optimal (45–75)

45px

18px

13px

❌ Critical: 13px body text is too small. Increase to at least 14px.

⚠️ Tight line spacing (1.10). Consider 1.4-1.6 for better readability.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ Risky: Text appears on background images without overlay protection.

✅ Optimal line length: ~80 characters per line is comfortable to read.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(11)assets.adobedtm.com(5)google.com(2)census.gov(2)

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Last analyzed: 11 Feb 2026 at 00:23

Historical Analysis & Change Tracking