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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vutbr.cz

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

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vutbr.cz

Sponsored

Hosting Provider

VUTBR

IP Address

147.229.2.90

Server Location

🇨🇿 Brno, Czechia

ASN

AS197451

Organization

VUTBR

Server

Nginx

Nameservers

rhino.cis.vutbr.cz.pipit.cis.vutbr.cz.

Performance

Page Speed

1.4 MB

49 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

VUTBR

Technology Stack

9 Technologies Detected

Analytics

Libraries

UI Components

Other

CSS Frameworks

Tag Managers

Advertising

Web Servers

SEO Analysis

D44/100

vutbr.czvutbr.cz

Vysoké učení technické v Brně

Vysoké učení technické v Brně je česká vysoká škola s více než 120letou tradicí, která neustále posiluje svou pozici špičkové vědecko-výzkumné instituce. Tec...

Description truncated.

Title Length29 chars

Recommended: 50-60 chars

Description Length261 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (8/14)

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

29 rules

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

66d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.01.2026

Valid Until

25.04.2026

Subject Alternative Names (1)

www.vut.cz

SHA-256 Fingerprint

02:EE:23:D9:5C:EC:42:49:75:06:A0:32:A3:51:0F:EC:02:65:3E:DE...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-length

13557

content-security-policy

default-src * data: blob: filesystem: about: ws: wss: 'unsaf...

content-type

text/html; charset=utf-8

date

Tue, 17 Feb 2026 12:31:12 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mailgw1.ro.vutbr.cz

Domain Information

vutbr.cz

Domain Age

31y 9m

Created

19.05.1994

Expires

11.10.2026

Last Updated

18.11.2022

Registrar

REG-INTERNET-CZ

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Vafle + Open Sans

51/100

Readability

/30

32/40

14px · LH 1.79

Hierarchy

/20

18/25

2.57x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Vafle

Sans36px

Body Font

Open Sans

Sans14px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

36px

13px

24px

18px

14px

Minor Second

Scale

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.79 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.6x larger than body text.

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

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

⚠️ Cramped layout: 60 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(10)googletagmanager.com(4)cdn.cookiehub.eu(1)

Website Identity

Facebook X (Twitter)Instagram Threads Bluesky

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Last analyzed: 17 Feb 2026 at 12:31

Historical Analysis & Change Tracking