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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fes.de

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

Export

fes.de

Mobile

Sponsored

Hosting Provider

Friedrich Ebert Stiftung e.V.

IP Address

195.243.222.30

Server Location

🇩🇪 Cologne, Germany

ASN

AS3320

Organization

Friedrich Ebert Stiftung e.V.

Server

Nginx

Nameservers

ns2.fes.de.pns.dtag.de.ns.fes.de.

Performance

Page Speed

925 KB

26 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

CMS

TYPO3

Infrastructure

Hosting

Friedrich Ebert Stiftung e.V.

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

5 Technologies Detected

Other

CSS Frameworks

Icon Libraries

Analytics

Web Servers

SEO Analysis

A84/100

fes.defes.de

Friedrich-Ebert-Stiftung

Wir als FES stehen für Freiheit, Gerechtigkeit & Solidarität in unserer Arbeit im In- und Ausland, der politischen Bildung und Beratung und der Studienförder...

Description truncated.

Title Length24 chars

Recommended: 50-60 chars

Description Length161 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Crawlability

Sitemap

Type: index

17 URLs

robots.txt

5 rules

Sponsored

Security Score

65%Fair

Critical / Transactional

HTTPS

No WAF

301d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

10.11.2025

Valid Until

11.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.fes.defes.de

SHA-256 Fingerprint

F5:0B:55:AE:BB:AD:80:55:0F:CC:FB:52:A7:FE:F0:00:0A:12:7F:4E...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

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HTTP Headers

Developer Console

access-control-allow-origin

cache-control

🔴 No Cache(private, no-store)

content-encoding

📦 Gzip(gzip)

content-language

de-DE

content-security-policy

frame-ancestors 'self' https://*.fes.de

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mail1.fes.de

Domain Information

fes.de

Last Updated

14.01.2021

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Ebert + Helvetica

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

4x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Ebert

Sans64px

Body Font

Helvetica

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

64px

42px

24px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

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

⚠️ Cramped layout: 34 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

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Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

9 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(5)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube TikTok Bluesky

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Last analyzed: 13 Feb 2026 at 22:07

Historical Analysis & Change Tracking