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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zoll.de

https://zoll.de· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

zoll.de

Sponsored

Hosting Provider

ZIVIT B

IP Address

80.245.156.44

Server Location

🇩🇪 Troisdorf, Germany

ASN

AS35704

Server

Apache

Nameservers

secondary006.dtag.net.ns1.itzbund.de.ns2.itzbund.de.pns.dtag.de.

Performance

Page Speed

1.6 MB

54 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

ZIVIT B

Technology Stack

4 Technologies Detected

Libraries

CSS Frameworks

Analytics

Web Servers

SEO Analysis

C64/100

zoll.dezoll.de

Zoll online - Startseite

No description available for this page.

Title Length38 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (21/25)

3 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

9 rules

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

352d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

D-Trust GmbH

Key Algorithm

RSA (4096 bit)

Signature

SHA-512 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

06.02.2026

Valid Until

07.02.2027

Subject Alternative Names (20)

www.zoll.dezollverwaltung.dezoll-online.dezollmuseum.dezollkriminalamt.euzollkriminalamt.dezoll-koblenz.dezoll-karriere.de+12 more

SHA-256 Fingerprint

87:0F:77:D9:D2:87:74:C6:93:3A:A5:86:31:CF:96:2E:E2:69:99:5C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-origin

https://zollweb-editor.preview.zoll.intranet.bund.de

cache-control

🟡 0s(max-age=0)

connection

Keep-Alive

content-language

content-security-policy

default-src 'self' 'unsafe-inline' zollweb.preview.zoll.intr...

content-type

text/html;charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

lxmxext1.bfinv.de

lxmxext2.bfinv.de

Domain Information

zoll.de

Last Updated

01.11.2024

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Roboto Slab + Roboto

93/100

Readability

/30

40/40

18px · LH 1.60

Hierarchy

/20

25/25

2.89x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Roboto Slab

Sans52px

Body Font

Roboto

Sans18px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

52px

30px

32px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

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

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 19 elements lack adequate spacing.

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

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

dashboard.stage.bio(1)SiteGlobals(1)

Website Identity

Facebook X (Twitter)Bluesky

Sponsored

Last analyzed: 19 Feb 2026 at 16:20

Historical Analysis & Change Tracking