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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eur.nl

https://eur.nl· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

eur.nl

Mobile

Sponsored

Hosting Provider

Erasmus Universiteit Rotterdam

IP Address

145.5.1.13

Server Location

🇳🇱 Rotterdam, The Netherlands

ASN

AS1103

Organization

Erasmus Universiteit Rotterdam

CDN

Nameservers

ns1.surfnet.nl.ns2.surfnet.nl.ns1.zurich.surf.net.ns3.surfnet.nl.

Performance

Page Speed

1.4 MB

42 requests

Image Optimization

Lazy LoadAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Erasmus Universiteit Rotterdam

CDN

Technology Stack

6 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

SEO Analysis

A82/100

eur.nleur.nl

Erasmus University Rotterdam

Erasmus Universiteit Rotterdam (EUR) formuleert oplossingen voor de maatschappij van de toekomst. Bekijk onze bachelor- en masteropleidingen.

Title Length28 chars

Recommended: 50-60 chars

Description Length141 chars

Recommended: 120-160 chars

Issues (0)

2 issues found

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Crawlability

Sitemap

Type: index

11 URLs

robots.txt

66 rules

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

251d

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

25.10.2025

Valid Until

25.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (17)

www.mastercitydeveloper.nlmaritimeeconomics.comcms-prod-single.eur.nlwww.risbo.nliss.nlstyleguide.eur.nlmastercitydeveloper.nlstorybook.eur.nl+9 more

SHA-256 Fingerprint

0E:37:0A:36:9A:87:AA:85:FE:FC:CC:0D:86:25:D9:2D:10:7E:54:E1...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔵 1 Days(max-age=86400, public)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-src 'self' https://eur.nl https://www.eur.nl https://s...

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

eur-nl.mail.protection.outlook.com

Domain Information

eur.nl

Domain Age

38y 1m

Created

13.01.1988

Last Updated

04.11.2025

Registrar

SURF B.V.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

MuseoSans

88/100

Readability

/30

40/40

17px · LH 1.53

Hierarchy

/20

25/25

2.35x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

MuseoSans

Sans40px

Body Font

MuseoSans

Sans17px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

40px

23px

20px

17px

✅ Excellent readability: 17px body text is ideal for all devices.

✅ Optimal line spacing: 1.53 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

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Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)googletagmanager.com(1)cdn.cookielaw.org(1)data.eur.nl(1)cdnjs.cloudflare.com(1)

Website Identity

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 15 Feb 2026 at 01:26

Historical Analysis & Change Tracking