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

uni-duesseldorf.de

https://uni-duesseldorf.de· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

uni-duesseldorf.de

Sponsored

Hosting Provider

Unid LAN

IP Address

134.99.128.238

Server Location

🇩🇪 Düsseldorf, Germany

ASN

AS680

Organization

Unid LAN

Server

Apache

Nameservers

dns-1.dfn.de.dns-2.dfn.de.sirene.rz.uni-duesseldorf.de.selene.rz.uni-duesseldorf.de.+1 more

Performance

Page Speed

5.4 MB

41 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

TYPO3

Technology Stack

11 Technologies Detected

UI Components

Slick Carousel Fancybox

CSS Frameworks

Frameworks

Meta Frameworks

Libraries

Other

Icon Libraries

Analytics

Web Servers

SEO Analysis

B74/100

uni-duesseldorf.deuni-duesseldorf.de

HHU

Die Heinrich-Heine-Universität Düsseldorf ist eine der jüngeren Hochschulen des Landes NRW – gegründet 1965. Seit 1988 trägt die Universität den Namen des gr...

Description truncated.

Title Length3 chars

Recommended: 50-60 chars

Description Length179 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

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Crawlability

Sitemap

robots.txt

33 rules

Sponsored

Security Score

31%Critical

Interactive

HTTPS

No WAF

335d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

21.01.2026

Valid Until

21.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

hhu.dewww.hera.hhu.dewww.gffu.hhu.decedus.hhu.dewww.science-fight.hhu.dehaus-der-universitaet.hhu.dewww.sbv.hhu.dewww.igrad.hhu.de+12 more

SHA-256 Fingerprint

21:F6:C6:CB:FD:0A:CE:E6:2C:7E:10:F8:F2:92:0E:96:A8:8C:56:CC...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

age

192

cache-control

🟡 3405s(max-age=3405)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-language

de-DE

content-length

62246

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

b2881.mx.srv.dfn.de

a2881.mx.srv.dfn.de

c2881.mx.srv.dfn.de

Domain Information

uni-duesseldorf.de

Last Updated

09.01.2020

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Lato

81/100

Readability

/30

40/40

18px · LH 1.50

Hierarchy

/20

18/25

2.22x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Lato

Sans40px

Body Font

Lato

Sans18px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

40px

28px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

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

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

✅ Protected text on images: Using text-shadow for readability.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(10)matomo.hhu.de(1)

Website Identity

Facebook Instagram YouTube Bluesky

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Last analyzed: 19 Feb 2026 at 21:22

Historical Analysis & Change Tracking