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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utwente.nl

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

Export

utwente.nl

Mobile

Sponsored

Hosting Provider

Universiteit Twente

IP Address

130.89.12.12

Server Location

🇳🇱 Hengelo, The Netherlands

ASN

AS1133

Organization

Universiteit Twente

Server

Nginx

Nameservers

ns3.utwente.nl.ns2.utwente.nl.ns1.utwente.nl.

Performance

Page Speed

19 requests

Image Optimization

Lazy LoadAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Universiteit Twente

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

CSS Frameworks

Analytics

Tag Managers

Web Servers

SEO Analysis

D55/100

utwente.nlutwente.nl

Universiteit Twente (UT) | Enschede

Volg wetenschappelijk onderwijs (wo) aan een technische onderzoeksuniversiteit met de enige all-in campus in Nederland. Bekijk onze bachelor- en masteropleid...

Description truncated.

Title Length35 chars

Recommended: 50-60 chars

Description Length163 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (5/8)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

11 rules

Sitemap reference found

Sponsored

Security Score

66%Fair

Interactive

HTTPS

No WAF

329d

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/2

Valid From

08.01.2026

Valid Until

08.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (3)

webhare.utwente.nlwww.utwente.nlutwente.nl

SHA-256 Fingerprint

23:21:CB:10:4C:44:4F:0F:54:FE:AE:8A:8C:2F:6D:BD:FD:CF:F8:13...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-length

13734

content-security-policy

frame-ancestors 'self' https://webhare.utwente.nl https://po...

content-type

text/html; charset=UTF-8

date

Thu, 12 Feb 2026 23:47:12 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

utwente-nl.mail.protection.outlook.com

Domain Information

utwente.nl

Domain Age

39y 4m

Created

16.10.1986

Last Updated

03.11.2020

Registrar

Universiteit Twente

DNSSEC

Not Enabled

Typography & Readability

Arial

56/100

Readability

/30

25/40

18px · LH 1.00

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Arial

Sans

Body Font

Arial

Sans18px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

26px

18px

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

⚠️ Tight line spacing (1.00). Consider 1.4-1.6 for better readability.

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

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

⚠️ Cramped layout: 7 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

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

5 Resources

Scripts

Styles

Async

Defer

Top Script Sources

tagging.utwente.nl(2)utwente.becdn.net(1)analytics.silktide.com(1)

Website Identity

Facebook Instagram TikTok

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Last analyzed: 12 Feb 2026 at 23:47

Historical Analysis & Change Tracking