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

free.fr

https://free.fr· First analyzed 10 Feb 2026· Updated 10 Feb 2026

Export

free.fr

Mobile

Sponsored

Hosting Provider

ProXad network / Free SA

IP Address

212.27.48.10

Server Location

🇫🇷 Paris, France

ASN

AS12322

Organization

ProXad network / Free SA

Server

Nginx

Nameservers

freens3-scw.free.fr.freens1-g20.free.fr.freens2-g20.free.fr.

Performance

Page Speed

6.5 MB

79 requests

0–49

50–89

90–100

Architecture Stack

Hybrid

⚡ SSG

Frontend

Framework

Next.js

Styling

Tailwind CSS

Infrastructure

Hosting

ProXad network / Free SA

Technology Stack

4 Technologies Detected

Meta Frameworks

CSS Frameworks

Icon Libraries

Web Servers

SEO Analysis

B76/100

free.frfree.fr

Free : offres internet Fibre, Wi-Fi 7, TV et ligne fixe sans engage...

Passez à la Fibre ultra rapide dès 24,99€/mois. Très Haut Débit, Wi-Fi 7 dernière génération, Box 5G et forfaits mobiles 5G, sans engagement.

Title truncated.

Title Length71 chars

Recommended: 50-60 chars

Description Length141 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Sponsored

Security Score

86%Very Good

Static / Informational

HTTPS

No WAF

155d

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Tue, 10 Feb 2026 20:29:14 GMT

etag

W/"6981d855-286d8"

last-modified

Tue, 03 Feb 2026 11:13:25 GMT

server

nginx/1.22.1

Good Warning Issue

Typography & Readability

Iliad + Montserrat

58/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

2.67x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Iliad

Sans40px

Body Font

Montserrat

Sans15px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

40px

28px

32px

15px

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

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

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

⚠️ Risky: Text appears on background images without overlay protection.

⚠️ Cramped layout: 88 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

PlausibleSMB

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(17)sdk.privacy-center.org(2)pm.web.proxad.net(1)

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Last analyzed: 10 Feb 2026 at 20:29

Historical Analysis & Change Tracking