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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estranky.cz

https://estranky.cz· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

estranky.cz

Sponsored

Hosting Provider

Nethost s.r.o.

IP Address

81.0.235.78

Server Location

🇨🇿 Prague, Czechia

ASN

AS15685

Organization

Nethost s.r.o.

Nameservers

tns.nethost.cz.dns.nethost.cz.sns.nethost.sk.

Performance

Page Speed

54 KB

43 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Nethost s.r.o.

Technology Stack

8 Technologies Detected

CSS Frameworks

Analytics

Libraries

Icon Libraries

Fonts

Tag Managers

SEO Analysis

D44/100

estranky.czestranky.cz

Tvorba webových stránek zdarma a rychle - eStránky.cz

Tvorba webových stránek zdarma☝️ Vyzkoušejte eStránky.cz a založte si svůj web či blog snadno a rychle bez znalosti programování. Výběr z mnoha šablon. Podpo...

Description truncated.

Title Length53 chars

Recommended: 50-60 chars

Description Length173 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (16/17)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

103 URLs

robots.txt

6 rules

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

358d

Certificate Details

Type

Domain Validated (DV)

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

14.01.2026

Valid Until

10.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.estranky.czestranky.cz

SHA-256 Fingerprint

D3:9A:77:C9:AA:AB:D2:7A:69:2A:6B:17:DD:99:8A:CE:16:93:AE:8B...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔵 Public(public)

connection

Keep-Alive

content-length

33880

content-type

text/html; charset=UTF-8

date

Tue, 17 Feb 2026 06:11:25 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

sns.nethost.sk

mail.estranky.cz

Domain Information

estranky.cz

Domain Age

22y 2m

Created

10.12.2003

Expires

09.12.2026

Last Updated

23.06.2022

Registrar

REG-ACTIVE24

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

Arial

30/100

Readability

/30

20/40

13px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Arial

Sans

Body Font

Arial

Sans13px

Contrast Ratio

Reading Comfort

~49 CPL

Optimal (45–75)

17px

28px

24px

13px

Major Third

Scale

❌ Critical: 13px body text is too small. Increase to at least 14px.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

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

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

GGoogle Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

25 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.cpex.cz(6)googletagmanager.com(3)sdk.privacy-center.org(2)gstatic.com(2)google.com(2)

Website Identity

Facebook

Sponsored

Last analyzed: 17 Feb 2026 at 06:11

Historical Analysis & Change Tracking