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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esmadrid.com

https://esmadrid.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

esmadrid.com

Sponsored

Hosting Provider

Asac Comunicaciones S.L

IP Address

185.79.128.45

Server Location

🇪🇸 Llanera, Spain

ASN

AS200165

Nameservers

ns.transparentedge.eu.ns.transparentedge.es.

Performance

Page Speed

84 KB

70 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Asac Comunicaciones S.L

Detected API Sources

https://player.vimeo.com/api/p...

Technology Stack

7 Technologies Detected

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Meta Frameworks

Libraries

CSS Frameworks

Analytics

Advertising

SEO Analysis

A+100/100

esmadrid.comesmadrid.com

Turismo Madrid | Turismo Madrid

Página turística oficial del Ayuntamiento de Madrid, con toda la información para disfrutar al máximo de tu visita a nuestra ciudad.

Title Length31 chars

Recommended: 50-60 chars

Description Length132 chars

Recommended: 120-160 chars

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

303d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

17.11.2025

Valid Until

17.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.esmadrid.comesmadrid.com

SHA-256 Fingerprint

25:B8:97:4E:53:5D:2D:0D:92:98:32:95:B4:D2:69:E6:1B:9D:24:29...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

366

cache-control

🟡 1 Hours(max-age=3600, s-maxage=3600)

content-encoding

📦 Gzip(gzip)

content-length

38745

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

mx02.hornetsecurity.com

mx03.hornetsecurity.com

mx01.hornetsecurity.com

Domain Information

esmadrid.com

Domain Age

23y 8m

Created

28.06.2002

Expires

28.06.2026

Last Updated

19.11.2025

Registrar

Acens Technologies, S.L.U.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Typography & Readability

Helvetica

31/100

Readability

/30

12/40

12px · LH 1.30

Hierarchy

/20

18/25

2.5x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Helvetica

Sans30px

Body Font

Helvetica

Sans12px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

30px

32px

40px

12px

Major Second

Scale

❌ Critical: 12px body text is too small. Increase to at least 14px.

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

⚠️ Cramped layout: 27 elements lack adequate spacing.

AAdobe Fonts Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Facebook SDKFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

estaticos.esmadrid.com(10)esmadrid.com(4)youtube.com(2)securepubads.g.doubleclick.net(2)connect.facebook.net(1)

Website Identity

Facebook X (Twitter)Instagram YouTube

Sponsored

Last analyzed: 17 Feb 2026 at 20:44

Historical Analysis & Change Tracking