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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planet.nl

https://planet.nl· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

planet.nl

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

52.18.216.171

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS EC2 (eu-west-1)

CDN

CloudFront

Nameservers

ns13.kpn.net.ns14.kpn.net.

Performance

Page Speed

1 MB

46 requests

Image Optimization

WebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Nuxt.js

API

Data Source

Headless CMS

Contentful

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Detected API Sources

//images.ctfassets.net/zuadwp3...

Technology Stack

3 Technologies Detected

Meta Frameworks

Nuxt.js

CSS Frameworks

Tailwind CSS

Analytics

Google Analytics

SEO Analysis

D47/100

planet.nlplanet.nl

Pagina niet gevonden | KPN

Pagina niet gevonden

Title Length26 chars

Recommended: 50-60 chars

Description Length20 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (9/10)

7 issues found

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A+

Security Score

92%Excellent

Interactive

HTTPS

No WAF

211d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

18.08.2025

Valid Until

18.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (4)

www.kpn.comkpn.comkpn.nlwww.kpn.nl

SHA-256 Fingerprint

29:18:89:D4:83:D0:69:53:72:93:00:1F:D0:5D:B8:9B:5C:AC:69:17...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

cache-control

🔴 No Cache(no-cache)

content-encoding

⚡ Brotli(br)

content-security-policy

connect-src 'self' *.kpn.com kpn.com *.kpn.org *.adobetm.com...

content-type

text/html;charset=utf-8

cross-origin-opener-policy

same-origin

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mx.kpnmail.nl

Domain Information

planet.nl

Domain Age

29 years

Created

13.02.1997

Last Updated

31.07.2025

Registrar

KPN

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

-apple-system

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

4.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

-apple-system

Sans72px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

72px

20px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.5x 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.

⚠️ Cramped layout: 19 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)assets.adobedtm.com(4)static.kpn.com(3)deploy.mopinion.com(1)kpn.com(1)

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Last analyzed: 19 Feb 2026 at 11:22

Historical Analysis & Change Tracking