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.

Back to Search

proxmox.com

https://proxmox.com· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

proxmox.com

Mobile

Sponsored

Hosting Provider

First Colo GmbH

IP Address

212.224.123.69

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS44066

Organization

First Colo GmbH

Nameservers

ns6.kapper.net.ns1.kapper.net.ns2.kapper.net.ns5.kapper.net.+4 more

Performance

Page Speed

676 KB

51 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Joomla!

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

4 Technologies Detected

Frameworks

CSS Frameworks

Icon Libraries

Analytics

SEO Analysis

B78/100

proxmox.comproxmox.com

Proxmox - Powerful open-source server solutions

Proxmox develops powerful and efficient open-source server solutions like the Proxmox VE platform, Proxmox Backup Server, and Proxmox Mail Gateway.

Title Length47 chars

Recommended: 50-60 chars

Description Length147 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (20/29)

2 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

18 rules

Sitemap reference found

Sponsored

Security Score

84%Very Good

Interactive

HTTPS

No WAF

87d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

12.02.2026

Valid Until

13.05.2026

Subject Alternative Names (7)

maurer-it.comnewsletter.proxmox.comproxmox.comproxmox.itwww.maurer-it.comwww.proxmox.comwww.proxmox.it

SHA-256 Fingerprint

E6:32:02:97:35:FB:53:40:B2:B2:96:F4:87:09:2C:8C:D7:0E:5B:C7...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate, post-check=0, pre-check...)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self'

content-type

text/html; charset=utf-8

date

Sun, 15 Feb 2026 00:16:21 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.proxmox.com

Domain Information

proxmox.com

Domain Age

21y 11m

Created

08.03.2004

Expires

08.03.2027

Last Updated

07.02.2026

Registrar

eNom, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Lato + Open Sans

59/100

Readability

/30

40/40

16px · LH 1.62

Hierarchy

/20

18/25

3.19x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Lato

Sans51px

Body Font

Open Sans

Sans16px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

51px

36px

23px

16px

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

✅ Optimal line spacing: 1.62 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.2x 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: 11 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(14)piwik.proxmox.com(1)

Website Identity

X (Twitter)LinkedIn

Sponsored

Last analyzed: 15 Feb 2026 at 00:16

Historical Analysis & Change Tracking