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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belastingdienst.nl

https://belastingdienst.nl· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

belastingdienst.nl

Mobile

Sponsored

Hosting Provider

Netbnd

IP Address

85.159.98.33

Server Location

🇳🇱 Amsterdam, The Netherlands

ASN

AS24595

Organization

Netbnd

Nameservers

ns3.belastingdienst.nl.ns4.belastingdienst.nl.ns2.belastingdienst.nl.

Performance

Page Speed

1.4 MB

46 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Netbnd

Technology Stack

5 Technologies Detected

Libraries

CSS Frameworks

Other

SEO Analysis

C68/100

belastingdienst.nlbelastingdienst.nl

Belastingdienst Nederland | Belastingdienst

Startpunt voor belastingen. Lees hoe u aangifte doet en wanneer wij uw voorlopige aanslag uitbetalen. Of vind het antwoord op uw vraag in het menu en bij bel...

Description truncated.

Title Length43 chars

Recommended: 50-60 chars

Description Length174 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

43 rules

Sitemap reference found

Sponsored

Security Score

55%Poor

Critical / Transactional

HTTPS

No WAF

77d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Ireland Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

02.04.2025

Valid Until

03.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.belastingdienst.nlbelastingdienst.nl

SHA-256 Fingerprint

FE:E8:CE:8E:B0:F7:8F:23:7F:A1:3E:6F:A0:85:26:15:04:C4:32:45...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

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HTTP Headers

Developer Console

accept-ranges

bytes

connection

Keep-Alive

content-length

25320

content-security-policy

default-src https://*.belastingdienst.nl https://vinden.bela...

content-type

text/html; charset=utf-8

date

Sun, 15 Feb 2026 00:37:42 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

smtp2.belastingdienst.nl

smtp1.belastingdienst.nl

Domain Information

belastingdienst.nl

Domain Age

30y 3m

Created

02.11.1995

Last Updated

11.10.2025

Registrar

Belastingdienst

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Segoe UI

59/100

Readability

/30

25/40

20px · LH 1.00

Hierarchy

/20

13/25

1.7x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Segoe UI

Sans34px

Body Font

Segoe UI

Sans20px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

34px

21px

18px

21px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

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

✅ Good hierarchy: Clear distinction between headlines and body text.

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

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

✅ Protected text on images: Using text-shadow for readability.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

A/B Testing & Optimization

AB TastyMid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(14)pwa001.belastingdienst.nl(4)try.abtasty.com(1)download.belastingdienst.nl(1)

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Last analyzed: 15 Feb 2026 at 00:37

Historical Analysis & Change Tracking