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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rozhlas.cz

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

Export

rozhlas.cz

Sponsored

Hosting Provider

ALGOTECH, s.r.o

IP Address

91.241.10.4

Server Location

🇨🇿 Prague, Czechia

ASN

AS35236

Organization

ALGOTECH, s.r.o

Server

Nginx

Nameservers

ns1.cro.cz.ns2.cro.cz.nsa.ces.net.

Performance

Page Speed

4.1 MB

100 requests

Image Optimization

Lazy LoadAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupalv7

Technology Stack

11 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Microsoft Clarity Segment

Libraries

Meta Frameworks

Other

CSS Frameworks

Tag Managers

Web Servers

SEO Analysis

C62/100

rozhlas.czrozhlas.cz

Portál Českého rozhlasu

Nejrychlejší zpravodajství a vysílání online. Stanice, program, podcasty, nové rozhovory, rozhlasové hry a audioknihy.

Title Length23 chars

Recommended: 50-60 chars

Description Length118 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

robots.txt

87 rules

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

114d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

13.05.2025

Valid Until

13.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.rozhlas.czrozhlas.cz

SHA-256 Fingerprint

29:FB:67:81:0E:8E:A6:9A:8E:A3:04:C3:E6:50:37:21:E7:48:A7:F1...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-origin

cache-control

🔴 No Cache(no-cache, must-revalidate)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-language

content-security-policy

upgrade-insecure-requests

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (3)

ddei1.cro.cz

ddei2.cro.cz

rs.cesnet.cz

Domain Information

rozhlas.cz

Domain Age

28y 2m

Created

17.12.1997

Expires

20.10.2032

Last Updated

13.11.2018

Registrar

REG-INTERNET-CZ

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

rozhlas_medium + rozhlas_regular

63/100

Readability

/30

32/40

16px · LH 1.38

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

rozhlas_medium

Sans

Body Font

rozhlas_regular

Sans16px

Contrast Ratio

Reading Comfort

~40 CPL

Needs attention

15px

16px

Minor Second

Scale

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

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

✅ Protected text on images: Using overlay for readability.

⚠️ Cramped layout: 139 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Enterprise

Behavior Analytics

Microsoft ClarityFree

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(14)googletagmanager.com(3)scripts.clarity.ms(1)clarity.ms(1)google-analytics.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube

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Last analyzed: 19 Feb 2026 at 17:11

Historical Analysis & Change Tracking