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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rtl.fr

https://rtl.fr· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

rtl.fr

Mobile

Sponsored

Hosting Provider

Cyllene ITS

IP Address

185.151.191.59

Server Location

🇫🇷 La Madeleine, France

ASN

AS34993

Organization

Cyllene ITS

CDN

Fastly

Nameservers

ns.rtlnet.fr.ns.rtl.fr.

Performance

Page Speed

51 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

Infrastructure

Hosting

Cyllene ITS

CDN

Fastly

Technology Stack

5 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Tag Managers

SEO Analysis

C68/100

rtl.frrtl.fr

Toute l'actualité en direct et en vidéo sur RTL.fr : politique, int...

Consultez en temps réel toutes les informations sur RTL.fr : politique, international, faits divers, économie, sciences et environnement...

Title truncated.

Title Length94 chars

Recommended: 50-60 chars

Description Length139 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (93/97)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

13 URLs

robots.txt

33 rules

Sitemap reference found

Sponsored

A+

Security Score

93%Excellent

Static / Informational

HTTPS

No WAF

194d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

26.07.2025

Valid Until

27.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

*.rtl.fr

SHA-256 Fingerprint

EE:11:5C:9E:DC:ED:D0:BE:81:CB:4B:8D:85:F9:F1:A2:20:0A:46:A6...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

cache-control

🟡 60s(public, max-age=60)

content-encoding

📦 Gzip(gzip)

content-language

fr-FR

content-length

245336

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mx1.m6.fr

mx2.m6.fr

Domain Information

rtl.fr

Domain Age

28y 10m

Created

09.04.1997

Expires

27.11.2026

Last Updated

01.11.2025

Registrar

GANDI

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

sans-serif

87/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

sans-serif

Sans28px

Body Font

sans-serif

Sans14px

Contrast Ratio

Reading Comfort

~42 CPL

Needs attention

28px

35px

18px

40px

14px

Major Second

Scale

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

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

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

✅ Protected text on images: Using gradient for readability.

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

consent.rtl.fr(2)l.rtl.fr(1)tag.aticdn.net(1)googletagmanager.com(1)static.rtl.fr(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn TikTok

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Last analyzed: 14 Feb 2026 at 10:19

Historical Analysis & Change Tracking