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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zcu.cz

https://zcu.cz· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

zcu.cz

Sponsored

Hosting Provider

Zapadoceska univerzita v Plzni

IP Address

147.228.6.224

Server Location

🇨🇿 Pilsen, Czechia

ASN

AS2852

Organization

Zapadoceska univerzita v Plzni

Server

OpenCms/16.0.0

Nameservers

hera.zcu.cz.erebos.zcu.cz.nsa.ces.net.

Performance

Page Speed

1.8 MB

55 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Zapadoceska univerzita v Plzni

Technology Stack

5 Technologies Detected

Libraries

CSS Frameworks

Analytics

Tag Managers

SEO Analysis

A80/100

zcu.czzcu.cz

Západočeská univerzita v Plzni

Západočeská univerzita v Plzni má více než 300 studijních programů na devíti fakultách. Spojte život s jednou z nich a rozhodněte se pro studium v Plzni.

Title Length30 chars

Recommended: 50-60 chars

Description Length153 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

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Crawlability

Sitemap

Type: index

2 URLs

robots.txt

4 rules

Sitemap reference found

Allows all crawlers

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Security Score

76%Good

Interactive

HTTPS

No WAF

68d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

29.01.2026

Valid Until

29.04.2026

Subject Alternative Names (2)

www.zcu.czzcu.cz

SHA-256 Fingerprint

8C:EE:91:3C:76:61:7B:FF:D2:D0:F1:B7:04:23:B3:80:E5:D2:17:85...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 0s(public, max-age=0)

content-encoding

📦 Gzip(gzip)

content-security-policy

base-uri 'self'; default-src 'self' data: https://dumbledore...

content-type

text/html;charset=UTF-8

date

Thu, 19 Feb 2026 17:39:27 GMT

last-modified

Thu, 19 Feb 2026 17:39:27 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

fred.zcu.cz

Domain Information

zcu.cz

Domain Age

29y 3m

Created

10.11.1996

Expires

19.10.2027

Last Updated

23.06.2022

Registrar

REG-ACTIVE24

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Roboto Condensed + Open Sans

73/100

Readability

/30

30/40

16px · LH --

Hierarchy

/20

25/25

3x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Roboto Condensed

Sans48px

Body Font

Open Sans

Sans16px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

48px

40px

20px

16px

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

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

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

⚠️ Cramped layout: 13 elements lack adequate spacing.

⚠️ Inconsistent alignment: Mix of left/center/right creates visual noise.

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Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

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Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(20)

Website Identity

Facebook Instagram YouTube Bluesky

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Last analyzed: 19 Feb 2026 at 17:39

Historical Analysis & Change Tracking