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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taschen.com

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

Export

taschen.com

Sponsored

Hosting Provider

OPENIT

IP Address

46.163.122.12

Server Location

🇩🇪 Cologne, Germany

ASN

AS61157

Organization

OPENIT

Nameservers

ns.udag.org.ns.udag.de.ns.udag.net.

Performance

Page Speed

3.1 MB

113 requests

Image Optimization

Lazy LoadResponsiveCloudinary

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Infrastructure

Hosting

OPENIT

CDN

Cloudinary

Technology Stack

6 Technologies Detected

Meta Frameworks

CSS Frameworks

Icon Libraries

Tag Managers

Analytics

SEO Analysis

B74/100

taschen.comtaschen.com

Books for Optimists Since 1980. TASCHEN

TASCHEN is a leading art-book publisher known for its dazzling and audacious world of eye-catching coffee table books.

Title Length39 chars

Recommended: 50-60 chars

Description Length118 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

5 URLs

robots.txt

41 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

23d

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

15.12.2025

Valid Until

15.03.2026

Subject Alternative Names (2)

data.taschen.comwww.taschen.com

SHA-256 Fingerprint

25:69:E9:A8:21:F0:B2:FA:0C:CC:FC:5F:7D:7C:73:EA:D2:E7:F4:C9...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

cache-control

🔴 No Cache(max-age=0, no-cache, no-store)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Thu, 19 Feb 2026 09:55:57 GMT

expires

Thu, 19 Feb 2026 09:55:57 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

taschen-com.mail.protection.outlook.com

Domain Information

taschen.com

Domain Age

29y 8m

Created

03.06.1996

Expires

02.06.2026

Last Updated

27.01.2026

Registrar

united-domains GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Typography & Readability

FoundersGroteskCondensed + Inter

61/100

Readability

/30

32/40

15px · LH 1.49

Hierarchy

/20

8/25

1.2x ratio

WCAG

/25

11/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

FoundersGroteskCondensed

Sans18px

Body Font

Inter

Sans15px

Contrast Ratio

Reading Comfort

~42 CPL

Needs attention

18px

22px

16px

14px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.49 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

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

⚠️ Cramped layout: 11 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

HotjarMid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

static.hotjar.com(12)local(6)tags.creativecdn.com(1)data.taschen.com(1)

Website Identity

Facebook Instagram TikTok

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Last analyzed: 19 Feb 2026 at 09:56

Historical Analysis & Change Tracking