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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gwdg.de

https://gwdg.de· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

gwdg.de

Sponsored

Hosting Provider

Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH

IP Address

134.76.9.48

Server Location

🇩🇪 Göttingen, Germany

ASN

AS207592

Organization

Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH

Server

Apache

Nameservers

dns3.gwdg.de.dns2.gwdg.de.dns1.gwdg.de.

Performance

Page Speed

697 KB

18 requests

Image Optimization

WebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Gesellschaft fuer wissenschaftliche Datenverarbeitung mbH

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Icon Libraries

Font Awesome

Web Servers

Apache

SEO Analysis

D58/100

gwdg.degwdg.de

GWDG | GWDG - IT in der Wissenschaft

No description available for this page.

Title Length36 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (9/12)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

2 URLs

robots.txt

Sponsored

Security Score

86%Very Good

Static / Informational

HTTPS

No WAF

262d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (3072 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

07.11.2025

Valid Until

07.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

gwdg.depasswort.gwdg.defaq.gwdg.deantivir.gwdg.dewww.gwdg.euwww-portal.gwdg.dexn--gttinger-rechenzentrum-uhc.decdn.gwdg.de+12 more

SHA-256 Fingerprint

68:C9:B9:AE:84:BE:08:70:26:83:FB:6A:E4:36:A1:7B:9D:4F:5F:6E...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔴 No Cache(no-cache)

content-encoding

📦 Gzip(gzip)

content-length

5511

content-security-policy

frame-ancestors 'self'; default-src 'none'; media-src *.gwdg...

content-type

text/html

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

a1234.mx.srv.dfn.de

c1234.mx.srv.dfn.de

b1234.mx.srv.dfn.de

Domain Information

gwdg.de

Last Updated

19.01.2021

DNSSEC

Not Enabled

Typography & Readability

universcom + Arimo

75/100

Readability

/30

32/40

14px · LH 1.71

Hierarchy

/20

18/25

2.29x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

universcom

Sans32px

Body Font

Arimo

Sans14px

Contrast Ratio

Reading Comfort

~45 CPL

Optimal (45–75)

32px

21px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.71 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.3x larger than body text.

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

✅ Optimal line length: ~45 characters per line is comfortable to read.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(1)

Website Identity

Facebook Instagram LinkedIn

Sponsored

Last analyzed: 17 Feb 2026 at 14:54

Historical Analysis & Change Tracking