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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louvre.fr

https://louvre.fr· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

louvre.fr

Mobile

Sponsored

Hosting Provider

Netscalibur UK Ltd

IP Address

195.157.4.130

Server Location

🇬🇧 Ashford, United Kingdom

ASN

AS8426

Organization

Netscalibur UK Ltd

Server

wadp2

CDN

Nameservers

ns1.fr.claradns.net.ns0.fr.claradns.net.ns2.fr.claradns.net.

Performance

Page Speed

601 KB

78 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

CMS

Drupal

Infrastructure

Hosting

Netscalibur UK Ltd

CDN

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

5 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Tag Managers

SEO Analysis

C64/100

louvre.frlouvre.fr

Site officiel du musée du Louvre

Préparez votre visite, découvrez les lieux emblématiques du palais et les collections du musée et suivez l'actualité du Louvre et des Tuileries.

Title Length32 chars

Recommended: 50-60 chars

Description Length144 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (59/60)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

2,902 URLs

robots.txt

53 rules

Sponsored

A+

Security Score

92%Excellent

Interactive

HTTPS

No WAF

348d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Gandi

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

26.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.louvre.frlouvre.fr

SHA-256 Fingerprint

4E:19:C7:5F:D2:F2:39:84:8B:FD:1B:94:75:18:C7:67:4E:F7:BB:55...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-headers

Origin, Accept, Content-Type, X-Requested-With, X-CSRF-Token...

access-control-allow-methods

GET, OPTIONS

access-control-allow-origin

https://www.louvre.fr

age

1341

cache-control

🟡 0s(s-maxage=1800, public, max-age=0, stale-while-revalidate=60)

Good Warning Issue

Email Infrastructure

Barracuda

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

d349869a.ess.barracudanetworks.com

d349869b.ess.barracudanetworks.com

Domain Information

louvre.fr

Domain Age

30y 7m

Created

16.07.1995

Expires

30.12.2026

Last Updated

07.12.2025

Registrar

GANDI

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Roboto

70/100

Readability

/30

32/40

14px · LH 1.57

Hierarchy

/20

8/25

1.14x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Roboto

Sans16px

Body Font

Roboto

Sans14px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

16px

14px

24px

14px

Perfect Fourth

Scale

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

✅ Optimal line spacing: 1.57 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ 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.

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Microsoft ClarityFree

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(19)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube

Sponsored

Last analyzed: 12 Feb 2026 at 13:36

Historical Analysis & Change Tracking