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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ceskatelevize.cz

https://ceskatelevize.cz· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

ceskatelevize.cz

Mobile

Sponsored

Hosting Provider

Ceska televize

IP Address

85.239.69.9

Server Location

🇨🇿 Prague, Czechia

ASN

AS6855

CDN

Nameservers

ceskatelevize2.ns.nic.cz.ceskatelevize1.ns.nic.cz.

Performance

Page Speed

33 KB

112 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Ceska televize

CDN

Technology Stack

9 Technologies Detected

Analytics

Libraries

Other

CSS Frameworks

Tag Managers

Advertising

SEO Analysis

D56/100

ceskatelevize.czceskatelevize.cz

Česká televize

Sledujte ČT on-line. Zpravodajství, publicistika, sport, počasí, pořady od A do Z. Programy ČT1, ČT2, ČT24, ČT sport a videoarchiv iVysílání. Česká veřejnopr...

Description truncated.

Title Length14 chars

Recommended: 50-60 chars

Description Length171 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

21 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

132d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

27.05.2025

Valid Until

27.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.ceskatelevize.czceskatelevize.cz

SHA-256 Fingerprint

C9:A7:76:ED:D9:7B:95:E3:3C:E8:7C:E4:46:89:E7:9C:13:36:AC:A2...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🟡 120s(max-age=120, must-revalidate)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Sun, 15 Feb 2026 10:45:37 GMT

transfer-encoding

chunked

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mail3.czech-tv.cz

mail4.czech-tv.cz

Domain Information

ceskatelevize.cz

Domain Age

25y 8m

Created

04.06.2000

Expires

04.06.2027

Last Updated

27.09.2025

Registrar

REG-CZNIC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Verdana + sans-serif

61/100

Readability

/30

30/40

16px · LH --

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Verdana

Sans

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

24px

22px

16px

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

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

⚠️ Cramped layout: 17 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

imgct.ceskatelevize.cz(5)googletagmanager.com(4)ctfs.ceskatelevize.cz(4)spir.hit.gemius.pl(1)scripts.clarity.ms(1)

Website Identity

Facebook X (Twitter)Instagram Threads

Sponsored

Last analyzed: 15 Feb 2026 at 10:45

Historical Analysis & Change Tracking