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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edf.fr

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

Export

edf.fr

Sponsored

Hosting Provider

Electricite de France SA

IP Address

163.62.76.152

Server Location

🇫🇷 Nanterre, France

ASN

AS1301

Organization

Electricite de France SA

Server

Apache

CDN

Akamai

WAF

Akamai

Nameservers

ns1.edf.fr.ns2.edf.fr.

Performance

Page Speed

657 KB

24 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Electricite de France SA

CDN

Akamai

Technology Stack

5 Technologies Detected

Libraries

CSS Frameworks

Analytics

Web Servers

Customer Support

SEO Analysis

C67/100

edf.fredf.fr

EDF France | EDF FR

No description available for this page.

Title Length19 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (17/19)

3 issues found

Upgrade to view details

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Security Score

81%Very Good

Interactive

HTTPS

WAF

232d

Certificate Details

Type

Extended Validation (EV)

Certificate Authority

DigiCert Ireland Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

08.10.2025

Valid Until

07.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

edf.frchile.edf-powersolutions.comcotedivoire.edf.comwww.czech-republic.edf.comwww.edf.mqwww.nuward.comwww.poland.edf.comksa.edf-powersolutions.com+12 more

SHA-256 Fingerprint

3A:DB:1A:F7:7D:4C:AB:91:02:AB:E7:7D:15:FA:3F:E3:9C:D5:9E:C5...

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 5 Hours(public, max-age=21141)

content-encoding

📦 Gzip(gzip)

content-language

content-length

14063

content-security-policy

object-src 'none'; frame-ancestors 'self'

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

mx1.hc2212-17.eu.iphmx.com

mx2.hc2212-17.eu.iphmx.com

Domain Information

edf.fr

Domain Age

31y 1m

Created

31.12.1994

Expires

15.06.2026

Last Updated

02.07.2025

Registrar

NAMESHIELD

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

EDF-Bold + EDF-Regular

81/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

18/25

3x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

EDF-Bold

Sans48px

Body Font

EDF-Regular

Sans16px

Contrast Ratio

Reading Comfort

~42 CPL

Needs attention

48px

32px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

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

⚠️ Cramped layout: 7 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

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

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)cdn.trustcommander.net(2)cdn.tagcommander.com(2)tag.aticdn.net(1)

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Last analyzed: 17 Feb 2026 at 05:23

Historical Analysis & Change Tracking