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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mzv.cz

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

Export

mzv.cz

Sponsored

Hosting Provider

Etnetera

IP Address

185.145.160.111

Server Location

🇨🇿 Praha 3, Czechia

ASN

AS24971

Organization

Etnetera

Server

EWA/3.0

Nameservers

ns1.f5clouddns.com.ns2.mzv.cz.ns1.mzv.cz.ns2.f5clouddns.com.

Performance

Page Speed

5 MB

63 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Etnetera

Technology Stack

3 Technologies Detected

Analytics

Google Analytics

Segment

Libraries

jQuery

SEO Analysis

D52/100

mzv.czmzv.cz

Ministerstvo zahraničních věcí České republiky

Prezentace MZV ČR, poskytující aktuální informace o ministerstvu, cestách do zahraničí, diplomatických misích, úřadech v zahraničí

Title Length46 chars

Recommended: 50-60 chars

Description Length130 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Missing viewport meta tag - page may not be mobile-friendly

6 issues found

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Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

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Security Score

46%Poor

Interactive

HTTPS

No WAF

286d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

05.11.2025

Valid Until

02.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (5)

www.mzv.czedit.mzv.czedit.mzv.gov.czmzv.czmzv.gov.cz

SHA-256 Fingerprint

5A:70:17:97:1E:15:AE:F9:45:D0:B1:34:5F:52:8A:56:A0:62:F8:AB...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟣 Private(private)

content-encoding

📦 Gzip(gzip)

content-length

12916

content-type

text/html;charset=utf-8

date

Thu, 19 Feb 2026 19:09:25 GMT

last-modified

Wed, 18 Feb 2026 08:44:03 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mzvczemta06.mzv.cz

mzvczemta05.mzv.cz

Domain Information

mzv.cz

Domain Age

29y 2m

Created

27.12.1996

Expires

20.10.2026

Last Updated

24.01.2024

Registrar

REG-ACTIVE24

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Georgia + Arial

28/100

Readability

/30

10/40

10px · LH --

Hierarchy

/20

8/25

1x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Georgia

Serif10px

Body Font

Arial

Sans10px

Contrast Ratio

Reading Comfort

~61 CPL

Optimal (45–75)

10px

18px

20px

10px

Augmented Fourth

Scale

❌ Critical: 10px body text is too small. Increase to at least 14px.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

⚠️ Risky: Text appears on background images without overlay protection.

✅ Optimal line length: ~61 characters per line is comfortable to read.

⚠️ Cramped layout: 18 elements lack adequate spacing.

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Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(16)google.com(1)ssl.google-analytics.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

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Last analyzed: 19 Feb 2026 at 19:09

Historical Analysis & Change Tracking