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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cea.fr

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

Export

cea.fr

Sponsored

Hosting Provider

CEA-RENATER

IP Address

132.167.224.6

Server Location

🇫🇷 Clamart, France

ASN

AS2200

Server

Microsoft IIS

Nameservers

oxalide.extra.cea.fr.cirse.extra.cea.fr.sainfoin.extra.cea.fr.

Performance

Page Speed

4.5 MB

98 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

CEA-RENATER

Technology Stack

8 Technologies Detected

CSS Frameworks

Meta Frameworks

Libraries

Analytics

Web Servers

Frameworks

Customer Support

SEO Analysis

D58/100

cea.frcea.fr

Recherche et innovation - Le CEA, acteur majeur de la recherche au ...

Le CEA est un acteur majeur de la recherche, au service de l'État, de l'économie et des citoyens. Il apporte des solutions concrètes à leurs besoins dans qua...

Title truncated. Description truncated.

Title Length116 chars

Recommended: 50-60 chars

Description Length289 chars

Recommended: 120-160 chars

Issues (1)

• Missing viewport meta tag - page may not be mobile-friendly

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

2 URLs

robots.txt

87 rules

Sponsored

Security Score

61%Fair

Interactive

HTTPS

No WAF

29d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

18.03.2025

Valid Until

18.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (3)

www.cea.frwww.www.cea.frcea.fr

SHA-256 Fingerprint

D0:22:80:A0:04:CB:5D:87:CF:06:28:FC:B3:EA:E3:00:4F:45:60:24...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 0s(private, max-age=0)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

36897

content-security-policy

frame-ancestors 'self' teams.microsoft.com *.teams.microsoft...

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (3)

cirse-smtp-in.extra.cea.fr

sainfoin-smtp-in.extra.cea.fr

oxalide-smtp-in.extra.cea.fr

Domain Information

cea.fr

Domain Age

31y 1m

Created

31.12.1994

Expires

31.12.2026

Last Updated

31.01.2026

Registrar

GIP RENATER

DNSSEC

Not Enabled

Typography & Readability

RobotoSlab-Thin + FontFace

51/100

Readability

/30

40/40

16px · LH 1.70

Hierarchy

/20

13/25

1.62x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

10/20

4 fonts

Heading Font

RobotoSlab-Thin

Sans26px

Body Font

FontFace

Sans16px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

26px

52px

20px

15px

16px

Minor Second

Scale

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

✅ Optimal line spacing: 1.70 ratio ensures comfortable reading.

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

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

⚠️ Cramped layout: 19 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(17)gstatic.com(1)cdn.matomo.cloud(1)cea.matomo.cloud(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

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Last analyzed: 17 Feb 2026 at 04:00

Historical Analysis & Change Tracking