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

web.de

https://web.de· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

web.de

$Desktop screenshot of web.de$

$Mobile screenshot of web.de$

Mobile

Sponsored

Hosting Provider

IONOS (1&1)

ionos.com

IP Address

82.165.229.138

Server Location

🇩🇪 Karlsruhe, Germany

ASN

AS8560

Organization

Ionos Inf

Server

Apache

Nameservers

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

Performance

Page Speed

72 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

3 Technologies Detected

Meta Frameworks

Astro

Advertising

Criteo

Web Servers

Apache

SEO Analysis

D50/100

web.deweb.de

WEB.DE - kostenlose E-Mail-Adresse, FreeMail & Nachrichten

Sichere Kommunikation, aktuelle Nachrichten und nützliche Online-Services - alles an einem Ort. Einfach, kostenlos und zuverlässig.

Title Length58 chars

Recommended: 50-60 chars

Description Length131 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Missing viewport meta tag - page may not be mobile-friendly

6 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

32 rules

Sponsored

Security Score

86%Very Good

Interactive

HTTPS

No WAF

65d

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)

*.web.deweb.de

SHA-256 Fingerprint

35:FB:30:58:9F:2F:F2:2A:4B:32:4C:ED:B2:B1:38:31:35:20:BF:8F...

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

Fri, 13 Feb 2026 09:39:38 GMT

expires

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mx-ha02.web.de

mx-ha03.web.de

Domain Information

web.de

Last Updated

11.04.2016

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

webdesans

56/100

Readability

/30

25/40

16px · LH 1.17

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

webdesans

Sans

Body Font

webdesans

Sans16px

Contrast Ratio

Reading Comfort

~71 CPL

Optimal (45–75)

34px

24px

16px

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

⚠️ Tight line spacing (1.17). Consider 1.4-1.6 for better readability.

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

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

✅ Optimal line length: ~71 characters per line is comfortable to read.

⚠️ Cramped layout: 191 elements lack adequate spacing.

Buy on MyFonts

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

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Last analyzed: 13 Feb 2026 at 09:40

Historical Analysis & Change Tracking