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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tudelft.nl

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

Export

tudelft.nl

Mobile

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Hosting Provider

Technische Universiteit Delft

IP Address

130.161.128.82

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS1128

Organization

Technische Universiteit Delft

Nameservers

ns1.surfnet.nl.ns1.tudelft.nl.ns2.surfnet.nl.ns2.tudelft.nl.+1 more

Performance

Page Speed

410 KB

67 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

TYPO3

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

Libraries

Other

CSS Frameworks

Payments

SEO Analysis

B72/100

tudelft.nltudelft.nl

TU Delft | Technische Universiteit Delft | Challenge. Change. Impact!

Top onderwijs- en onderzoek staan centraal bij de oudste en grootste technische universiteit van Nederland. Onze 8 faculteiten bieden 16 bachelor- en meer da...

Description truncated.

Title Length69 chars

Recommended: 50-60 chars

Description Length347 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (76/78)

3 issues found

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Crawlability

Sitemap

Type: standard

212 URLs

robots.txt

8 rules

Sitemap reference found

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Security Score

65%Fair

Critical / Transactional

HTTPS

No WAF

30d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

ZeroSSL

Key Algorithm

RSA (2048 bit)

Signature

SHA-384 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

14.12.2025

Valid Until

14.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.tudelft.nl

SHA-256 Fingerprint

41:0D:43:07:24:B4:D7:56:27:7D:5F:8E:DA:0C:CD:D6:1D:18:AF:22...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

age

cache-control

🔴 No Cache(no-cache)

content-encoding

⚡ Brotli(br)

content-language

nl-NL

content-security-policy

default-src 'self'; script-src 'strict-dynamic' 'nonce-d0a06...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

tudelft-nl.mail.protection.outlook.com

Domain Information

tudelft.nl

Domain Age

38y 7m

Created

23.07.1987

Last Updated

09.10.2025

Registrar

Technische Universiteit Delft

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Legitimate interest basis mentioned

Typography & Readability

Roboto Slab + sans-serif

60/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

21/25

3.2x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Roboto Slab

Sans48px

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~46 CPL

Optimal (45–75)

48px

21px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.2x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Risky: Text appears on background images without overlay protection.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)consent.cookiebot.eu(2)browsealoud.com(2)siteimproveanalytics.com(1)

Website Identity

Facebook X (Twitter)Instagram YouTube GitHub

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Last analyzed: 12 Feb 2026 at 15:30

Historical Analysis & Change Tracking