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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desy.de

https://desy.de· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

desy.de

Mobile

Sponsored

Hosting Provider

Deutsches Elektronen-Synchrotron DESY

IP Address

131.169.5.106

Server Location

🇩🇪 Hamburg, Germany

ASN

AS1754

Organization

Deutsches Elektronen-Synchrotron DESY

CDN

Varnish

Nameservers

dwalin.nikhef.nl.ext-dns-2.cern.ch.way.desy.de.dns-2.dfn.de.+1 more

Performance

Page Speed

2.7 MB

38 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Deutsches Elektronen-Synchrotron DESY

CDN

Varnish

Technology Stack

6 Technologies Detected

CSS Frameworks

Meta Frameworks

Libraries

Icon Libraries

Analytics

SEO Analysis

D47/100

desy.dedesy.de

Deutsches Elektronen-Synchrotron DESY ·

No description available for this page.

Title Length39 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

2 URLs

robots.txt

Sponsored

A+

Security Score

100%Excellent

Static / Informational

HTTPS

No WAF

261d

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

08.11.2025

Valid Until

08.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.desy.dedesy.de

SHA-256 Fingerprint

82:99:FC:66:37:62:4A:A4:8D:97:35:C5:60:AA:CD:15:0F:C4:0B:D4...

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

100

connection

keep-alive

content-security-policy

upgrade-insecure-requests; frame-ancestors 'self';

content-type

text/html;charset=utf-8

date

Fri, 20 Feb 2026 01:35:41 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

c1721.mx.srv.dfn.de

a1721.mx.srv.dfn.de

b1721.mx.srv.dfn.de

Domain Information

desy.de

Last Updated

13.10.2017

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

DesySans-CnHeavy + DesySans-Regular

74/100

Readability

/30

40/40

21px · LH 1.61

Hierarchy

/20

18/25

2.86x ratio

WCAG

/25

11/15

Contrast: undefined

Performance

/25

10/20

4 fonts

Heading Font

DesySans-CnHeavy

Sans60px

Body Font

DesySans-Regular

Sans21px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

60px

36px

26px

21px

✅ Excellent readability: 21px body text is ideal for all devices.

✅ Optimal line spacing: 1.61 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.9x larger than body text.

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 12 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

desy.de(4)local(3)matomo.desy.de(1)

Website Identity

X (Twitter)Instagram LinkedIn YouTube

Sponsored

Last analyzed: 20 Feb 2026 at 01:35

Historical Analysis & Change Tracking