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

uspreventiveservicestaskforce.org

https://uspreventiveservicestaskforce.org· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

Sponsored

Hosting Provider

U.S. Dept. of Health and Human Services

IP Address

162.99.46.40

Server Location

🇺🇸 Rockville, United States

ASN

AS26810

Organization

U.S. Dept. of Health and Human Services

Server

Apache

CDN

Azure Cdn

Nameservers

ns2-03.azure-dns.net.ns3-03.azure-dns.org.ns4-03.azure-dns.info.ns1-03.azure-dns.com.

Performance

Page Speed

757 KB

24 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

6 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

Web Servers

SEO Analysis

C64/100

uspreventiveservicestaskforce.orguspreventiveservicestaskforce.org

Home page | United States Preventive Services Taskforce

No description available for this page.

Title Length55 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

15 rules

Sponsored

Security Score

61%Fair

Interactive

HTTPS

No WAF

41d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

04.03.2025

Valid Until

02.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

www.uspreventiveservicestaskforce.orguspreventiveservicestaskforce.orgdata.uspreventiveservicestaskforce.org

SHA-256 Fingerprint

6A:5A:A3:5F:FE:01:D7:4E:32:BA:E2:2B:0B:DC:3E:C5:84:A3:9F:4F...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(must-revalidate, no-cache, private)

content-encoding

📦 Gzip(gzip)

content-language

content-length

8892

content-type

text/html; charset=UTF-8

date

Fri, 20 Feb 2026 03:18:45 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

uspreventiveservicestaskforce.org

Domain Age

15y 7m

Created

01.07.2010

Expires

01.07.2026

Last Updated

04.09.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Montserrat

71/100

Readability

/30

40/40

16px · LH 1.70

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Montserrat

Sans

Body Font

Montserrat

Sans16px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

30px

18px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.70 ratio ensures comfortable reading.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(3)google-analytics.com(1)gateway.foresee.com(1)dap.digitalgov.gov(1)local(1)

Website Identity

Sponsored

Last analyzed: 20 Feb 2026 at 03:18

Historical Analysis & Change Tracking