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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idnes.cz

https://idnes.cz· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

idnes.cz

Mobile

Sponsored

Hosting Provider

MAFRA

IP Address

185.17.117.32

Server Location

🇨🇿 Prague, Czechia

ASN

AS38952

Organization

MAFRA

Nameservers

ns.mafracz.net.ns.mafra.cz.ns2.mafra.cz.

Performance

Page Speed

71 KB

250 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

MAFRA

Technology Stack

7 Technologies Detected

Analytics

Advertising

CSS Frameworks

Tag Managers

Customer Support

SEO Analysis

B78/100

idnes.czidnes.cz

iDNES.cz – s námi víte víc

Nejnovější zprávy z vašeho kraje, České republiky a celého světa.

Title Length26 chars

Recommended: 50-60 chars

Description Length65 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

73 URLs

robots.txt

52 rules

Sitemap reference found

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

361d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

ECDSA (secp384r1) (384 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

13.01.2026

Valid Until

08.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.idnes.czidnes.cz

SHA-256 Fingerprint

F8:4F:93:10:A4:71:7D:F0:55:18:08:3C:25:4B:53:5F:98:24:F6:09...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 0s(private,max-age=0)

connection

content-encoding

📦 Gzip(gzip)

content-length

57989

content-security-policy

upgrade-insecure-requests; default-src 'self' https: data: b...

content-type

text/html; charset=windows-1250

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (4)

smtp2.mafra.cz

smtp3.mafra.cz

smtp1.mafra.cz

smtp4.mafra.cz

Domain Information

idnes.cz

Domain Age

28y 2m

Created

30.11.1997

Expires

19.10.2026

Last Updated

27.05.2019

Registrar

REG-INTERNET-CZ

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

Fira Sans + sans-serif

80/100

Readability

/30

32/40

16px · LH 1.25

Hierarchy

/20

25/25

2.12x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Fira Sans

Sans34px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

34px

28px

14px

10px

16px

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

✅ Strong hierarchy: Headlines are 2.1x larger than body text.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 197 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

CriteoEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Reviews & Social Proof

TrustpilotMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.cpex.cz(4)1gr.cz(3)googletagmanager.com(2)privacy.1gr.cz(2)delivery.r2b2.cz(2)

Website Identity

Facebook X (Twitter)Instagram TikTok Telegram

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Last analyzed: 12 Feb 2026 at 21:29

Historical Analysis & Change Tracking