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

frebsite.nl

https://frebsite.nl· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

frebsite.nl

Mobile

Sponsored

Hosting Provider

Combell Network

IP Address

83.217.70.28

Server Location

🇧🇪 Ghent, Belgium

ASN

AS34762

Server

Nginx

Nameservers

ns1.combell.eu.ns3.combell.net.ns4.combell.net.

Performance

Page Speed

313 KB

4 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Combell Network

Technology Stack

4 Technologies Detected

Icon Libraries

Fonts

Web Servers

CSS Frameworks

SEO Analysis

D50/100

frebsite.nlfrebsite.nl

FrebSite / Personal website for Fred Heusschen

FrebSite, personal website for Fred Heusschen, a front-end developer who likes JS and CSS, a lot.

Title Length46 chars

Recommended: 50-60 chars

Description Length97 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

59d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

15.01.2026

Valid Until

15.04.2026

Subject Alternative Names (2)

frebsite.nlwww.frebsite.nl

SHA-256 Fingerprint

1E:1A:6D:D8:03:2B:2D:DD:32:C5:4E:23:9A:0C:FC:71:83:1C:59:93...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Sat, 14 Feb 2026 13:25:04 GMT

server

nginx

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (2)

mx.backup.mailprotect.be

mx.mailprotect.be

Domain Information

frebsite.nl

Domain Age

17y 3m

Created

19.11.2008

Last Updated

29.10.2025

Registrar

Combell B.V.

DNSSEC

Not Enabled

Typography & Readability

Kanit + sans-serif

93/100

Readability

/30

40/40

30px · LH 1.50

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Kanit

Sans60px

Body Font

sans-serif

Sans30px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

60px

30px

✅ Excellent readability: 30px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x 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.

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

GGoogle Fonts

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

Sponsored

Last analyzed: 14 Feb 2026 at 13:25

Historical Analysis & Change Tracking