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

elcorteingles.es

https://elcorteingles.es· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

elcorteingles.es

Sponsored

Hosting Provider

ECI

IP Address

185.90.81.234

Server Location

🇪🇸 Madrid, Spain

ASN

AS204643

Organization

ECI

CDN

Akamai

WAF

Akamai

Nameservers

dns5.elcorteingles.es.dns4.elcorteingles.es.dns6.elcorteingles.es.dns3.elcorteingles.es.

Performance

Page Speed

558 KB

220 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

HubSpot CMS

Technology Stack

26 Technologies Detected

Analytics

Amplitude Heap Analytics Plausible Analytics Matomo FullStory PostHog Heap Plausible

Advertising

Pinterest Tag TikTok Pixel Microsoft Advertising Criteo

Other

Optimizely VWO AB Tasty

Customer Support

CSS Frameworks

Tag Managers

Marketing

Email Marketing

SEO Analysis

A82/100

elcorteingles.eselcorteingles.es

El Corte Inglés: Comprar moda, electrónica, informática, libros online

Compra en El Corte Inglés las últimas novedades en moda, electrónica, informática, libros, deportes y mucho más de las mejores marcas al mejor precio.

Title Length70 chars

Recommended: 50-60 chars

Description Length150 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

2 issues found

Upgrade to view details

Sponsored

A+

Security Score

92%Excellent

Interactive

HTTPS

WAF

128d

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

10.02.2026

Valid Until

24.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

grupoeci.elcorteingles.esaccount.elcorteingles.comanalitica.seguros.elcorteingles.esapi.elcorteingles.esbackend.elcorteingles.esbitbucket.almeci.iocdn.grupoelcorteingles.escheckoutentradas3.elcorteingles.es+12 more

SHA-256 Fingerprint

E3:29:F8:B9:8C:AD:71:7B:D5:99:C5:4E:37:8F:B1:4C:17:51:1D:9F...

Upgrade to view header details

HTTP Headers

Developer Console

content-security-policy

frame-ancestors https://*.eci.geci http://*.eci.geci:* https...

cross-origin-opener-policy

same-origin-allow-popups

cross-origin-resource-policy

same-origin

origin-agent-cluster

referrer-policy

strict-origin-when-cross-origin

strict-transport-security

max-age=63072000; includeSubDomains; preload

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

elcorteingles-es.mail.protection.outlook.com

Domain Information

elcorteingles.es

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Typography & Readability

ECI-TITLE + ECI-TEXT

48/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

ECI-TITLE

Sans

Body Font

ECI-TEXT

Sans14px

Contrast Ratio

Reading Comfort

~129 CPL

Needs attention

40px

16px

14px

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

✅ Protected text on images: Using gradient for readability.

❌ Very long lines: ~129 chars/line causes eye strain. Use max-width: 65ch.

⚠️ Cramped layout: 40 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.grupoelcorteingles.es(8)googletagmanager.com(3)cdn.equalweb.com(2)cdn.cookielaw.org(2)bat.bing.com(1)

Sponsored

Last analyzed: 16 Feb 2026 at 10:32

Historical Analysis & Change Tracking