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

fu-berlin.de

https://fu-berlin.de· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

fu-berlin.de

Mobile

Sponsored

Hosting Provider

Freie Universitaet Berlin

IP Address

160.45.170.10

Server Location

🇩🇪 Berlin, Germany

ASN

AS680

Organization

Freie Universitaet Berlin

Server

Apache

Nameservers

atalante.stanford.edu.ns2.fu-berlin.de.ns1.fu-berlin.de.dns-2.dfn.de.+1 more

Performance

Page Speed

1.3 MB

24 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Freie Universitaet Berlin

Technology Stack

5 Technologies Detected

Libraries

UI Components

CSS Frameworks

Icon Libraries

Web Servers

SEO Analysis

B74/100

fu-berlin.defu-berlin.de

Freie Universität Berlin: Startseite

Die Freie Universität Berlin gehört seit 2007 zu den Exzellenzuniversitäten in Deutschland – sie ist führend in Wissenschaft und Lehre, in der Region vielfäl...

Description truncated.

Title Length36 chars

Recommended: 50-60 chars

Description Length291 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

200 URLs

robots.txt

16 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

251d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

21.10.2025

Valid Until

21.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

fu-berlin.dewww.freie-universitaet.dewww.xn--freieuniversitt-elb.dewww.freie-universitaet-berlin.berlinxn--freieuniversitt-elb.deuni-berlin.dewww.freie-universitaet.berlinxn--freie-universitt-9nb.de+12 more

SHA-256 Fingerprint

19:B3:2C:0F:B1:3B:28:99:EB:6B:27:13:C9:28:65:5A:7C:F9:BE:CB...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 0s(max-age=0, private, must-revalidate)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

11961

content-type

text/html; charset=utf-8

date

Thu, 12 Feb 2026 13:47:30 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mail.fu-berlin.de

Domain Information

fu-berlin.de

Last Updated

18.10.2019

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

SourceSansPro

74/100

Readability

/30

40/40

17px · LH 1.50

Hierarchy

/20

13/25

1.59x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

SourceSansPro

Sans27px

Body Font

SourceSansPro

Sans17px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

27px

23px

21px

17px

✅ Excellent readability: 17px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

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

⚠️ Cramped layout: 10 elements lack adequate spacing.

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Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)

Website Identity

Facebook Instagram YouTube Bluesky

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Last analyzed: 12 Feb 2026 at 13:47

Historical Analysis & Change Tracking