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

rug.nl

https://rug.nl· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

rug.nl

Mobile

Sponsored

Hosting Provider

Rijksuniversiteit Groningen

IP Address

129.125.2.51

Server Location

🇳🇱 Groningen, The Netherlands

ASN

AS1103

Organization

Rijksuniversiteit Groningen

Nameservers

dns1.rug.nl.dns2.rug.nl.ns1.surfnet.nl.dns3.rug.nl.+1 more

Performance

Page Speed

4.7 MB

48 requests

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Directus

Infrastructure

Hosting

Rijksuniversiteit Groningen

Detected API Sources

/about-ug/images/homepage/item...

Technology Stack

7 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

SEO Analysis

D52/100

rug.nlrug.nl

Top 100 University | University of Groningen

The University of Groningen has a high reputation for academic teaching and research and a large international network and offers degree programmes at Bachel...

Description truncated.

Title Length44 chars

Recommended: 50-60 chars

Description Length208 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (13/14)

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

26 rules

Sitemap reference found

Sponsored

Security Score

66%Fair

Interactive

HTTPS

No WAF

291d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

01.12.2025

Valid Until

01.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (7)

www.rug.nlwww.groningenuniversity.nlwww.rijksuniversiteitgroningen.nlwww.universityofgroningen.nlrug.nlproduction.ucms.rug.nlwww.universiteitgroningen.nl

SHA-256 Fingerprint

B4:E3:BE:6E:16:94:A2:20:31:2D:23:4F:E2:87:28:43:46:19:C5:E0...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

cache-control

🟡 0s(max-age=0, must-revalidate, proxy-revalidate)

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self'

content-type

text/html;charset=UTF-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

ALT2.ASPMX.L.GOOGLE.COM

ALT1.ASPMX.L.GOOGLE.COM

ASPMX2.GOOGLEMAIL.COM

ASPMX.L.GOOGLE.COM

+1 more

Domain Information

rug.nl

Domain Age

37y 8m

Created

02.06.1988

Last Updated

16.12.2025

Registrar

Rijksuniversiteit Groningen

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Open Sans Semi-Bold + Open Sans

61/100

Readability

/30

32/40

18px · LH 1.25

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Open Sans Semi-Bold

Sans

Body Font

Open Sans

Sans18px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

32px

23px

✅ Excellent readability: 18px body text is ideal for all devices.

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

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 15 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

Matomo (Piwik)Mid-Market

User behavior and product analytics

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(15)rug.containers.piwik.pro(2)googletagmanager.com(2)google-analytics.com(1)

Website Identity

Facebook Instagram

Sponsored

Last analyzed: 12 Feb 2026 at 16:21

Historical Analysis & Change Tracking