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.lu

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

Export

rtl.lu

Sponsored

Hosting Provider

BCE Webhosting

IP Address

81.92.238.106

Server Location

🇱🇺 Luxembourg, Luxembourg

ASN

AS25273

Organization

BCE Webhosting

CDN

CloudFront

Nameservers

ns-907.awsdns-49.net.ns-1363.awsdns-42.org.ns-1637.awsdns-12.co.uk.ns-175.awsdns-21.com.

Performance

Page Speed

1.5 MB

185 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Infrastructure

Hosting

BCE Webhosting

CDN

CloudFront

Technology Stack

3 Technologies Detected

Meta Frameworks

Next.js Astro

CSS Frameworks

Tailwind CSS

SEO Analysis

B72/100

rtl.lurtl.lu

Den Noriichteportal fir Lëtzebuerg, d’Groussregioun an d’Welt

Aktuell Noriichten zu a vu Lëtzebuerg: RTL.lu ass déi éischt Adress fir alles, wat am Land an doriwwer eraus geschitt. Mir informéiere ronderëm d'Auer – aktu...

Description truncated.

Title Length61 chars

Recommended: 50-60 chars

Description Length782 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (100/140)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

129 URLs

robots.txt

11 rules

Allows all crawlers

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

298d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

16.11.2025

Valid Until

15.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

rtl.lu*.rtl.lu

SHA-256 Fingerprint

E7:62:15:F1:2E:78:0B:6E:72:7B:41:A8:8B:1E:02:8C:40:B3:DB:1E...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

cache-control

🟡 60s(public, max-age=60, s-maxage=60, stale-while-revalidate=30)

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self' https://*.rtl.lu https://*.feedit.lu ...

content-type

text/html; charset=utf-8

date

Fri, 20 Feb 2026 09:21:55 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

rtl-lu.mail.protection.outlook.com

Domain Information

rtl.lu

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

rtlUnited + RTL United Text

55/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

20/25

1.6x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

rtlUnited

Sans24px

Body Font

RTL United Text

Sans15px

Contrast Ratio

Reading Comfort

~48 CPL

Optimal (45–75)

24px

23px

17px

15px

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

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

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

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

✅ 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

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

26 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)gstatic.com(3)sdk.privacy-center.org(2)cdn.onesignal.com(2)gabe.hit.gemius.pl(1)

Website Identity

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 20 Feb 2026 at 09:22

Historical Analysis & Change Tracking