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

ru.nl

https://ru.nl· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

ru.nl

Mobile

Sponsored

Hosting Provider

Radboud Universiteit Nijmegen

IP Address

131.174.78.60

Server Location

🇳🇱 Wijchen, The Netherlands

ASN

AS1103

Organization

Radboud Universiteit Nijmegen

Server

Nginx

Nameservers

ns1.zurich.surf.net.ns1.surfnet.nl.ns4.ru.nl.ns3.ru.nl.

Performance

Page Speed

1.3 MB

29 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

Analytics

Libraries

CSS Frameworks

Icon Libraries

Tag Managers

Advertising

Web Servers

SEO Analysis

C68/100

ru.nlru.nl

Radboud Universiteit

De Radboud Universiteit draagt bij aan een gezonde, vrije wereld met gelijke kansen voor iedereen en is zowel regionaal als internationaal van betekenis.

Title Length20 chars

Recommended: 50-60 chars

Description Length153 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

4 issues found

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Crawlability

Sitemap

Type: index

robots.txt

71 rules

Sitemap reference found

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

353d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

02.02.2026

Valid Until

02.02.2027

OCSP Stapling

Enabled

Subject Alternative Names (20)

wwwproxy.ru.nlverkiezingen.ru.nlzelfservice.ru.nltopdesk.ru.nlportal.ru.nlrbstst.hosting.ru.nlalumniweb.ru.nlontwikkeling.ru.nl+12 more

SHA-256 Fingerprint

1C:B9:FA:F4:CC:22:FF:2C:52:07:27:46:C1:2A:4D:80:13:4C:19:AB...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔵 1 Days(max-age=86400, public)

content-encoding

📦 Gzip(gzip)

content-language

content-length

11767

content-security-policy

img-src 'self' *.googletagmanager.com *.google-analytics.com...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

ru-nl.m-v1.mx.microsoft

Domain Information

ru.nl

Domain Age

26y 5m

Created

17.09.1999

Last Updated

23.01.2026

Registrar

Stichting Radboud Universiteit

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Typography & Readability

Open Sans

71/100

Readability

/30

40/40

22px · LH 1.45

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Open Sans

Sans

Body Font

Open Sans

Sans22px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

15px

22px

Perfect Fifth

Scale

✅ Excellent readability: 22px body text is ideal for all devices.

✅ Optimal line spacing: 1.45 ratio ensures comfortable reading.

✅ 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.

⚠️ Cramped layout: 30 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(2)local(1)

Website Identity

Facebook Instagram YouTube TikTok

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Last analyzed: 13 Feb 2026 at 21:00

Historical Analysis & Change Tracking