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.

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uni-marburg.de

https://uni-marburg.de· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

uni-marburg.de

Mobile

Sponsored

Hosting Provider

Philipps-Universitaet Marburg

IP Address

137.248.1.74

Server Location

🇩🇪 Marburg, Germany

ASN

AS680

Organization

Philipps-Universitaet Marburg

Server

Nginx

Nameservers

DNSp.uni-marburg.de.dns-1.dfn.de.DNSs1.uni-marburg.de.dns-2.dfn.de.+1 more

Performance

Page Speed

4.3 MB

57 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Philipps-Universitaet Marburg

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

4 Technologies Detected

Libraries

CSS Frameworks

Analytics

Web Servers

SEO Analysis

D58/100

uni-marburg.deuni-marburg.de

Philipps-Universität Marburg

Herzlich willkommen an der Philipps-Universität Marburg! Die Philipps-Universität, 1527 gegründet, gehört zu den traditionsreichsten Hochschulen Deutschlands...

Description truncated.

Title Length28 chars

Recommended: 50-60 chars

Description Length511 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (43/44)

5 issues found

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Crawlability

Sitemap

robots.txt

19 rules

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

No WAF

206d

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

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.09.2025

Valid Until

09.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (6)

www.uni-marburg.dewww.fotomarburg.dejupyter.uni-marburg.defotomarburg.dewww2.hrz.uni-marburg.deuni-marburg.de

SHA-256 Fingerprint

31:2A:14:1F:99:87:BB:A9:FF:5A:DD:C7:39:C1:68:49:9A:D5:B6:E6...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

age

761

cache-control

🟡 0s(max-age=0, s-maxage=3600, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-language

content-security-policy

default-src 'self' https://www.youtube.com https://www.youtu...

content-type

text/html;charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (3)

c2111.mx.srv.dfn.de

b2111.mx.srv.dfn.de

a2111.mx.srv.dfn.de

Domain Information

uni-marburg.de

Last Updated

02.12.2016

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Noto Sans Display + Noto Sans

74/100

Readability

/30

40/40

18px · LH 1.78

Hierarchy

/20

16/25

1.67x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Noto Sans Display

Sans30px

Body Font

Noto Sans

Sans18px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

30px

24px

22px

18px

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

✅ Optimal line spacing: 1.78 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

✅ Good performance: Using 2 font families keeps load times fast.

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

⚠️ Cramped layout: 57 elements lack adequate spacing.

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

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

webtrack.uni-marburg.de(1)local(1)uni-marburg.de(1)

Website Identity

Facebook Instagram YouTube

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Last analyzed: 15 Feb 2026 at 02:12

Historical Analysis & Change Tracking