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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gmx.net

https://gmx.net· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

gmx.net

Mobile

Sponsored

Hosting Provider

IONOS (1&1)

ionos.com

IP Address

82.165.229.87

Server Location

🇩🇪 Karlsruhe, Germany

ASN

AS8560

Organization

Ionos Inf

Server

Apache

Nameservers

ns-gmx.ui-dns.org.ns-gmx.ui-dns.de.ns-gmx.ui-dns.biz.ns-gmx.ui-dns.com.

Performance

Page Speed

65 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

IONOS (1&1)

Progressive Web App

Service Worker

Technology Stack

4 Technologies Detected

Meta Frameworks

Analytics

Advertising

Web Servers

SEO Analysis

C62/100

gmx.netgmx.net

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Title Length54 chars

Recommended: 50-60 chars

Description Length129 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

33 rules

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

No WAF

64d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Deutsche Telekom Security GmbH

Key Algorithm

RSA (3072 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

15.04.2025

Valid Until

19.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.gmx.netgmx.net

SHA-256 Fingerprint

AD:10:FF:35:56:95:F2:5A:D5:1D:B0:E5:67:29:C5:D9:7C:50:31:1A...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

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

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self' www.united-internet-media.de adimg.ui...

content-type

text/html;charset=UTF-8

date

Sat, 14 Feb 2026 04:29:00 GMT

expires

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mx01.emig.gmx.net

mx00.emig.gmx.net

Domain Information

gmx.net

Domain Age

27y 2m

Created

09.12.1998

Expires

08.12.2026

Last Updated

09.12.2025

Registrar

World4You Internet Services GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Roboto

80/100

Readability

/30

32/40

16px · LH 1.25

Hierarchy

/20

18/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Roboto

Sans32px

Body Font

Roboto

Sans16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

32px

14px

16px

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

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Cramped layout: 140 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

dl.gmx.net(5)js.ui-portal.de(4)s.uicdn.com(3)img.ui-portal.de(1)

Website Identity

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 14 Feb 2026 at 04:29

Historical Analysis & Change Tracking