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

dukehealth.org

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

Export

dukehealth.org

Sponsored

Hosting Provider

Microsoft Azure

azure.microsoft.com

IP Address

150.171.109.34

Server Location

🇰🇪 Nairobi, Kenya

ASN

AS8075

Organization

Microsoft Corporation

CDN

Nameservers

ns4-05.azure-dns.info.ns1-05.azure-dns.com.ns2-05.azure-dns.net.ns3-05.azure-dns.org.

Performance

Page Speed

2.2 MB

53 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

8 Technologies Detected

Analytics

Meta Frameworks

Libraries

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

SEO Analysis

A+90/100

dukehealth.orgdukehealth.org

Duke Health | Connect with your health care at Duke Health

As a world-class academic and health care system, Duke Health strives to transform medicine and health locally and globally.

Title Length58 chars

Recommended: 50-60 chars

Description Length124 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

4 URLs

robots.txt

48 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

111d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Internet2

Key Algorithm

RSA (2048 bit)

Signature

SHA-384 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

11.06.2025

Valid Until

11.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

dukehealth.orgwww.dukehealth.org

SHA-256 Fingerprint

5B:CC:D0:28:00:0F:48:66:73:A4:77:85:6B:41:2C:61:C4:E6:37:D3...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

127

cache-control

🟡 6 Hours(max-age=21600, public)

cache-tags

fQEX 37Yf ct64 iHIB HXL2 _QdY -rz1 V-P3 9fG4 irgR Pa5X Gy79 ...

content-encoding

📦 Gzip(gzip)

content-language

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

dukehealth-org.mail.protection.outlook.com

Domain Information

dukehealth.org

Domain Age

27y 1m

Created

08.01.1999

Expires

08.01.2030

Last Updated

08.12.2025

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

Open Sans

68/100

Readability

/30

24/40

15px · LH 1.33

Hierarchy

/20

21/25

2.67x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Sans40px

Body Font

Open Sans

Sans15px

Contrast Ratio

Reading Comfort

~48 CPL

Optimal (45–75)

40px

30px

19px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

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

✅ Protected text on images: Using gradient for readability.

✅ Optimal line length: ~48 characters per line is comfortable to read.

⚠️ Cramped layout: 13 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)googletagmanager.com(3)cdn.callrail.com(1)cdn.cookielaw.org(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube

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Last analyzed: 20 Feb 2026 at 08:52

Historical Analysis & Change Tracking