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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universiteitleiden.nl

https://universiteitleiden.nl· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

Mobile

Sponsored

Hosting Provider

Universiteit Leiden

IP Address

132.229.29.70

Server Location

🇳🇱 Oegstgeest, The Netherlands

ASN

AS1103

Organization

Universiteit Leiden

Nameservers

ns3.surfnet.nl.ns2.surfnet.nl.ns1.surfnet.nl.

Performance

Page Speed

689 KB

32 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Universiteit Leiden

Technology Stack

5 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

SEO Analysis

C64/100

universiteitleiden.nluniversiteitleiden.nl

Home - Universiteit Leiden

De Universiteit Leiden is een internationaal georiënteerde universiteit met een breed palet aan talentgericht onderwijs voor goede en gemotiveerde studenten,...

Description truncated.

Title Length26 chars

Recommended: 50-60 chars

Description Length213 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (6/7)

4 issues found

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Crawlability

Sitemap

Type: index

46 URLs

robots.txt

5 rules

Sitemap reference found

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

185d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

18.08.2025

Valid Until

18.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

cms.universiteitleiden.nlwww.bibliotheek.universiteitleiden.nlorganisatiegids.universiteitleiden.nlwww.luf.nlwww.medewerkers.universiteitleiden.nlbibliotheek.universiteitleiden.nlmedewerkers.universiteitleiden.nlluf.nl+12 more

SHA-256 Fingerprint

85:90:A2:14:6C:CF:D2:E8:D5:E3:05:04:E0:02:84:21:91:2A:51:35...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-methods

GET

access-control-allow-origin

access-control-max-age

3600

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self' https://leidenuniv.libwizard.com http...

content-type

text/html;charset=UTF-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

universiteitleiden-nl.k-v1.mx.microsoft

Domain Information

universiteitleiden.nl

Domain Age

25 years

Created

09.02.2001

Last Updated

19.12.2024

Registrar

team.blue nl B.V.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

georgia + vestula

75/100

Readability

/30

32/40

21px · LH 1.31

Hierarchy

/20

20/25

1.52x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

georgia

Serif32px

Body Font

vestula

Sans21px

Contrast Ratio

Reading Comfort

Serif Headlines + Sans Body

left aligned

32px

27px

21px

✅ Excellent readability: 21px body text is ideal for all devices.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

✅ Protected text on images: Using text-shadow for readability.

⚠️ Cramped layout: 13 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Microsoft ClarityFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)googletagmanager.com(3)

Website Identity

Facebook Instagram LinkedIn YouTube Mastodon Bluesky

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Last analyzed: 14 Feb 2026 at 00:54

Historical Analysis & Change Tracking