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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novinky.cz

https://novinky.cz· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

novinky.cz

Sponsored

Hosting Provider

Seznam - II

IP Address

77.75.78.151

Server Location

🇨🇿 Prague, Czechia

ASN

AS43037

Server

Envoy

Nameservers

ams.seznam.cz.ans.seznam.cz.

Performance

Page Speed

243 KB

67 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Seznam - II

Progressive Web App

Web ManifestApple Touch Icon

Detected API Sources

https://login.szn.cz/js/api/3/...

Technology Stack

4 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

SEO Analysis

A85/100

novinky.cznovinky.cz

Novinky.cz - nejčtenější zprávy na českém internetu

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Title Length51 chars

Recommended: 50-60 chars

Description Length136 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

30 rules

Sitemap reference found

Sponsored

Security Score

87%Very Good

Interactive

HTTPS

No WAF

57d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

16.01.2026

Valid Until

16.04.2026

Subject Alternative Names (2)

*.novinky.cznovinky.cz

SHA-256 Fingerprint

7B:FA:1F:17:A5:C0:2A:C5:38:A0:EA:87:F2:EB:E2:D2:E1:95:A7:0B...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self' www.seznam.cz share.seznam.cz search....

content-type

text/html; charset=utf-8

cross-origin-opener-policy

unsafe-none

cross-origin-resource-policy

same-origin

date

Wed, 18 Feb 2026 02:56:58 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

1e37bd9dc45a506b.mx1.emailprofi.seznam.cz

1e37bd9dc45a506b.mx2.emailprofi.seznam.cz

Domain Information

novinky.cz

Domain Age

28y 2m

Created

29.11.1997

Expires

19.10.2026

Last Updated

05.09.2022

Registrar

REG-SEZNAM

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Georgia

70/100

Readability

/30

25/40

16px · LH 1.13

Hierarchy

/20

18/25

2.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Georgia

Serif40px

Body Font

Georgia

Serif16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

40px

20px

34px

16px

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

⚠️ Tight line spacing (1.12). Consider 1.4-1.6 for better readability.

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

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

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

⚠️ Cramped layout: 90 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 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

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

d21-a.sdn.cz(11)d39-a.sdn.cz(2)local(2)h.seznam.cz(1)ssp.seznam.cz(1)

Website Identity

Facebook X (Twitter)

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Last analyzed: 18 Feb 2026 at 02:57

Historical Analysis & Change Tracking