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

bertelsmann-stiftung.de

https://bertelsmann-stiftung.de· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

Sponsored

Hosting Provider

Iquer

IP Address

185.57.241.76

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS201955

Organization

Iquer

Server

Nginx

CDN

Nameservers

ns2.iquer.net.ns1.iquer.net.ns0.iquer.net.

Performance

Page Speed

653 KB

26 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

TYPO3

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Other

lazysizes

CSS Frameworks

Tailwind CSS

Web Servers

Nginx

SEO Analysis

B76/100

bertelsmann-stiftung.debertelsmann-stiftung.de

Startseite

Mit ihren Projekten, Studien und Veranstaltungen regt die Bertelsmann Stiftung Debatten an und gibt Impulse für gesellschaftliche Veränderungen. Gemeinnützig...

Description truncated.

Title Length10 chars

Recommended: 50-60 chars

Description Length368 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

15 rules

Sitemap reference found

Sponsored

Security Score

31%Critical

Interactive

HTTPS

No WAF

266d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

10.10.2025

Valid Until

10.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.bertelsmann-stiftung.debertelsmann-stiftung.de

SHA-256 Fingerprint

7A:FC:B0:6C:59:2E:3B:AC:65:48:08:32:B9:00:DC:34:11:79:25:1F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

cache-control

🔴 No Cache(private, no-store, max-age=0)

content-encoding

📦 Gzip(gzip)

content-language

de-DE

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

bertelsmannstiftung-de02i.mail.protection.outlook.com

Domain Information

bertelsmann-stiftung.de

Last Updated

07.10.2019

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Lucida Grande

73/100

Readability

/30

25/40

30px · LH 1.00

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Lucida Grande

Sans60px

Body Font

Lucida Grande

Sans30px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

60px

12px

20px

30px

✅ Excellent readability: 30px body text is ideal for all devices.

⚠️ Tight line spacing (1.00). Consider 1.4-1.6 for better readability.

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

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

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

✅ Protected text on images: Using gradient for readability.

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

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets21.bertelsmann-stiftung.de(3)insights.bertelsmann-stiftung.de(3)local(1)

Website Identity

Facebook Instagram LinkedIn YouTube Bluesky

Sponsored

Last analyzed: 17 Feb 2026 at 18:18

Historical Analysis & Change Tracking