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

uni-heidelberg.de

https://uni-heidelberg.de· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

uni-heidelberg.de

Mobile

Sponsored

Hosting Provider

UNI-HEIDELBERG

IP Address

129.206.13.71

Server Location

🇩🇪 Eppelheim, Germany

ASN

AS553

Organization

UNI-HEIDELBERG

Server

Nginx

CDN

Varnish

Nameservers

dns2.uni-heidelberg.de.dns1.belwue.de.dns.uni-heidelberg.de.dns3.belwue.de.

Performance

Page Speed

1.3 MB

23 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

4 Technologies Detected

CSS Frameworks

Analytics

Web Servers

Frameworks

SEO Analysis

D58/100

uni-heidelberg.deuni-heidelberg.de

Heidelberg University

Title Length21 chars

Recommended: 50-60 chars

Description Length2 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (19/20)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

12 URLs

robots.txt

41 rules

Sponsored

Security Score

76%Good

Static / Informational

HTTPS

No WAF

302d

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

12.12.2025

Valid Until

12.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

*.ocp-west.urz.uni-heidelberg.deocp-west.urz.uni-heidelberg.deub.uni-heidelberg.deecho-wall.infowww.hse-heidelberg.dewww.urz.uni-heidelberg.de*.ocp-nord.urz.uni-heidelberg.deocp-nord.urz.uni-heidelberg.de+12 more

SHA-256 Fingerprint

67:1F:0F:E2:C2:9E:E0:B0:D5:71:C8:C3:66:EC:A4:42:0A:12:1C:08...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

3459

cache-control

🟡 0s(public, max-age=0, s-maxage=2628000)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Thu, 12 Feb 2026 14:26:45 GMT

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

relay.uni-heidelberg.de

relay3.uni-heidelberg.de

relay2.uni-heidelberg.de

Domain Information

uni-heidelberg.de

Last Updated

19.09.2023

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Roboto

80/100

Readability

/30

25/40

16px · LH 1.00

Hierarchy

/20

25/25

4.62x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Roboto

Sans74px

Body Font

Roboto

Sans16px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

74px

36px

16px

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

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

✅ Strong hierarchy: Headlines are 4.6x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

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

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

FathomSMB

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

4 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)cdn-eu.usefathom.com(1)

Website Identity

Facebook Instagram Bluesky

Sponsored

Last analyzed: 12 Feb 2026 at 14:26

Historical Analysis & Change Tracking