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

hogrefe.com

https://hogrefe.com· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

hogrefe.com

Sponsored

Hosting Provider

maxcluster GmbH

IP Address

194.6.208.155

Server Location

🇩🇪 Paderborn, Germany

ASN

AS47447

Organization

maxcluster GmbH

Server

Nginx

Nameservers

a.ns14.net.d.ns14.net.b.ns14.net.c.ns14.net.

Performance

Page Speed

1.1 MB

23 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

maxcluster GmbH

Technology Stack

6 Technologies Detected

Libraries

UI Components

Fonts

Web Servers

Languages

SEO Analysis

D50/100

hogrefe.comhogrefe.com

Etusivu - Hogrefe.fi

Hogrefe Psykologien Kustannus on tarjonnut korkealaatuisia testivälineitä, täydennyskoulutusta ja kirjallisuutta suomalaisille psykologeille jo 50 vuoden aja...

Description truncated.

Title Length20 chars

Recommended: 50-60 chars

Description Length420 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Missing viewport meta tag - page may not be mobile-friendly

7 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

167 rules

Sponsored

Security Score

31%Critical

Interactive

HTTPS

No WAF

47d

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

08.01.2026

Valid Until

08.04.2026

Subject Alternative Names (2)

hogrefe.fiwww.hogrefe.fi

SHA-256 Fingerprint

19:BB:F6:C7:15:76:2F:03:6D:30:2F:45:A2:BE:02:C1:A4:AC:E0:0F...

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, post-chec...)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Thu, 19 Feb 2026 20:24:10 GMT

expires

Thu, 19 Feb 2026 20:24:10 GMT

last-modified

Thu, 19 Feb 2026 20:24:10 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx.hogrefe.de

Domain Information

hogrefe.com

Domain Age

29y 5m

Created

09.09.1996

Expires

08.09.2026

Last Updated

09.09.2025

Registrar

InterNetX GmbH

DNSSEC

Not Enabled

Typography & Readability

IBM Plex Serif + sans-serif

53/100

Readability

/30

24/40

14px · LH 1.30

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

IBM Plex Serif

Serif

Body Font

sans-serif

Sans14px

Contrast Ratio

Reading Comfort

~61 CPL

Optimal (45–75)

20px

18px

14px

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

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

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

✅ Optimal line length: ~61 characters per line is comfortable to read.

⚠️ Cramped layout: 15 elements lack adequate spacing.

GGoogle Fonts

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdnjs.cloudflare.com(5)local(2)

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Last analyzed: 19 Feb 2026 at 20:24

Historical Analysis & Change Tracking