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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urssaf.fr

https://urssaf.fr· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

urssaf.fr

Sponsored

Hosting Provider

CERTI-UR

IP Address

193.178.136.246

Server Location

🇫🇷 Villeneuve-d'Ascq, France

ASN

AS48140

Organization

CERTI-UR

Nameservers

dns4.acoss.fr.dns3.acoss.fr.dns1.acoss.fr.dns2.acoss.fr.

Performance

Page Speed

4.7 MB

60 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

Infrastructure

Hosting

CERTI-UR

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

Libraries

UI Components

CSS Frameworks

Analytics

SEO Analysis

D47/100

urssaf.frurssaf.fr

Accueil - Urssaf.fr

Le site officiel de l’Urssaf propose un accompagnement personnalisé : retrouvez les informations nécessaires, découvrez nos services, réalisez vos déclaratio...

Description truncated.

Title Length19 chars

Recommended: 50-60 chars

Description Length161 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (59/69)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

2 URLs

robots.txt

9 rules

Sitemap reference found

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

64d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

Valid From

23.04.2025

Valid Until

22.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

urssaf.frwww.urssaf.fr

SHA-256 Fingerprint

FA:54:7B:6A:D0:17:6F:EF:F3:7A:F9:FE:C5:5A:A0:4E:F6:C7:0E:7F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

access-control-allow-headers

DNT,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since...

access-control-allow-methods

GET, PUT, POST, DELETE, PATCH, OPTIONS

access-control-allow-origin

access-control-max-age

1728000

cache-control

🔴 No Cache(no-cache, no-store, must-revalidate, proxy-revalidate, max-a...)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (6)

mx21.urssaf.fr

mx31.urssaf.fr

mx41.urssaf.fr

mx61.urssaf.fr

+2 more

Domain Information

urssaf.fr

Domain Age

30y 1m

Created

27.12.1995

Expires

28.06.2027

Last Updated

04.08.2025

Registrar

NAMESHIELD

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

montserratbold + robotoregular

70/100

Readability

/30

40/40

16px · LH 1.60

Hierarchy

/20

25/25

2x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

montserratbold

Sans32px

Body Font

robotoregular

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

32px

18px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

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

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

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

⚠️ Cramped layout: 51 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)res.tmg.urssaf.fr(2)cdn.doyoudreamup.com(2)res.tmg.urssaf.org(1)

Website Identity

X (Twitter)Instagram LinkedIn YouTube TikTok

Sponsored

Last analyzed: 17 Feb 2026 at 18:22

Historical Analysis & Change Tracking