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

rtl.be

https://rtl.be· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

rtl.be

Sponsored

Hosting Provider

Broadcasting Center Europe (an RTL Group Company)

IP Address

2.57.173.54

Server Location

🇱🇺 Luxembourg, Luxembourg

ASN

AS25273

Organization

Broadcasting Center Europe (an RTL Group Company)

Nameservers

ns0.be.colt.net.ns1.be.colt.net.

Performance

Page Speed

208 KB

56 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Progressive Web App

Web ManifestTheme Color

Technology Stack

11 Technologies Detected

Advertising

Google Ads Google AdSense Outbrain

CSS Frameworks

Analytics

Meta Frameworks

Libraries

Tag Managers

Customer Support

SEO Analysis

D52/100

rtl.bertl.be

RTL Info

Le site du journal RTL Info, premier site d'information en Belgique francophone. Actu en continu, archives gratuites, galeries photos, podcast, vidéos, blogs...

Description truncated.

Title Length8 chars

Recommended: 50-60 chars

Description Length204 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

21 URLs

robots.txt

123 rules

Sitemap reference found

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

65d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

26.01.2026

Valid Until

26.04.2026

Subject Alternative Names (4)

eng.rtl.beig.rtl.rosselcdn.netrtleng.rosselcdn.netwww.rtl.be

SHA-256 Fingerprint

7D:FC:1B:36:C7:32:1F:CE:F9:C4:6A:74:8F:DD:42:D3:7F:3F:32:52...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🔴 No Cache(private, no-cache)

content-encoding

📦 Gzip(gzip)

content-language

content-length

84613

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

rtl-be.mail.protection.outlook.com

Domain Information

rtl.be

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

roboto

70/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

roboto

Sans

Body Font

roboto

Sans15px

Contrast Ratio

Reading Comfort

~46 CPL

Optimal (45–75)

38px

26px

15px

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

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

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

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

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

✅ Protected text on images: Using gradient for readability.

Business & Marketing Stack

6 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

rtleng.rosselcdn.net(4)sso.rtl.be(3)local(3)sdk.privacy-center.org(2)tag.aticdn.net(1)

Website Identity

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 20 Feb 2026 at 10:10

Historical Analysis & Change Tracking