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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uni-bielefeld.de

https://uni-bielefeld.de· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

uni-bielefeld.de

Mobile

Sponsored

Hosting Provider

Universitaet Bielefeld

IP Address

129.70.240.4

Server Location

🇩🇪 Bielefeld, Germany

ASN

AS680

Organization

Universitaet Bielefeld

Server

Roxen/6.1.248-r5

Nameservers

dns-2.dfn.de.ns1.uni-bielefeld.de.ns2.uni-bielefeld.de.

Performance

Page Speed

1.3 MB

25 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

B76/100

uni-bielefeld.deuni-bielefeld.de

Bielefeld University

As a university internationally regarded for its top-level research and innovative teaching concepts, Bielefeld University makes a significant contribution t...

Description truncated.

Title Length20 chars

Recommended: 50-60 chars

Description Length401 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

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Crawlability

Sitemap

robots.txt

26 rules

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

269d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

11.11.2025

Valid Until

11.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

www.uni-bielefeld.deuni-bielefeld.dewwwfo.uni-bielefeld.de

SHA-256 Fingerprint

60:1E:13:91:FF:8B:1C:10:03:CB:67:D1:45:B9:35:6F:8C:04:9A:0F...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-length

30014

content-type

text/html; charset=UTF-8

date

Sat, 14 Feb 2026 12:43:02 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

b2631.mx.srv.dfn.de

a2631.mx.srv.dfn.de

c2631.mx.srv.dfn.de

Domain Information

uni-bielefeld.de

Last Updated

25.11.2024

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Lelo

88/100

Readability

/30

40/40

16px · LH 1.60

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Lelo

Sans32px

Body Font

Lelo

Sans16px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

32px

55px

24px

16px

Minor Second

Scale

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

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than 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: 59 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

11 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)uni-bielefeld.de(1)

Website Identity

Facebook X (Twitter)Instagram YouTube TikTok

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Last analyzed: 14 Feb 2026 at 12:43

Historical Analysis & Change Tracking