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

freenet.de

https://freenet.de· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

freenet.de

Mobile

Sponsored

Hosting Provider

freenet.de GmbH

IP Address

194.97.208.10

Server Location

🇩🇪 Hamburg, Germany

ASN

AS8648

Organization

freenet.de GmbH

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

mariah.ns.cloudflare.com.dylan.ns.cloudflare.com.

Performance

Page Speed

3.1 MB

155 requests

Image Optimization

Lazy LoadWebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

Frontend

Styling

Tailwind CSS

API

Data Source

Headless CMS

Contentful

Infrastructure

Hosting

freenet.de GmbH

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Detected API Sources

https://images.ctfassets.net/1...

Technology Stack

14 Technologies Detected

CSS Frameworks

Bootstrap

Tailwind CSS

Ant Design

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Analytics

Frameworks

Libraries

Other

UI Components

Icon Libraries

Tag Managers

CDN

SEO Analysis

C64/100

freenet.defreenet.de

freenet | Tarife in allen Netzen und günstige Handy-Angebote

Bei freenet findest Du Top-Tarife, Handys und Netze nach Deinen Bedürfnissen. Sichere Dir das passende Mobilfunk-Angebot und erlebe unsere Produktvielfalt.

Title Length60 chars

Recommended: 50-60 chars

Description Length155 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (30/44)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

508 URLs

robots.txt

32 rules

Sitemap reference found

Sponsored

Security Score

41%Poor

Interactive

HTTPS

WAF

224d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

26.09.2025

Valid Until

27.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.freenet.defreenet.de

SHA-256 Fingerprint

E4:BB:AE:A8:A0:A7:D1:12:8A:B1:8A:5F:90:FC:39:DE:D2:D6:4D:A5...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

date

Sun, 15 Feb 2026 03:35:00 GMT

content-type

text/html; charset=UTF-8

content-encoding

📦 Gzip(gzip)

x-forwarded-proto

https

cf-ray🇩🇪 Frankfurt

9ce1c0b1aaaf9f19-FRA

cf-cache-status

HIT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx.freenet.de

Domain Information

freenet.de

Last Updated

27.11.2025

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Open Sans + sans-serif

63/100

Readability

/30

32/40

14px · LH 1.40

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Body Font

sans-serif

Sans14px

Contrast Ratio

Reading Comfort

~56 CPL

Optimal (45–75)

14px

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

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

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

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

✅ Protected text on images: Using gradient for readability.

✅ Optimal line length: ~56 characters per line is comfortable to read.

AAdobe Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

freenet.de(8)local(5)static.md.de(3)cdn.privacy-mgmt.com(2)widgets.trustedshops.com(1)

Website Identity

Facebook Instagram YouTube

Sponsored

Last analyzed: 15 Feb 2026 at 03:35

Historical Analysis & Change Tracking