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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renfe.com

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

Export

renfe.com

Sponsored

Hosting Provider

Adif

IP Address

213.144.49.50

Server Location

🇪🇸 Madrid, Spain

ASN

AS15937

Organization

Adif

Server

Apache

Nameservers

dns1.renfe.es.a24-67.akam.net.dns2.renfe.es.a7-64.akam.net.+4 more

Performance

Page Speed

3.8 MB

96 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Technology Stack

4 Technologies Detected

CSS Frameworks

Analytics

Advertising

Web Servers

SEO Analysis

B74/100

renfe.comrenfe.com

Renfe | Billetes de tren Ave, Avlo al mejor precio sin comisiones

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Title Length65 chars

Recommended: 50-60 chars

Description Length147 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (33/35)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

15%Critical

Critical / Transactional

HTTPS

No WAF

295d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.12.2025

Valid Until

09.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

www.renfe.comasistentevirtual.dev.renfe.comasistentevirtual.int.renfe.comasistentevirtual.renfe.comgrupo.renfe.comgrupo.renfe.eshorarios.renfe.comwww.prep.renfe.com+1 more

SHA-256 Fingerprint

3C:59:DC:DB:18:B6:40:D5:E0:B2:64:4C:C8:9D:C1:D2:3E:74:BE:D5...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

content-encoding

📦 Gzip(gzip)

content-length

17831

content-type

text/html;charset=utf-8

date

Tue, 17 Feb 2026 04:02:49 GMT

etag

"1d416-64af4af54138a-gzip"

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

renfe.com

Domain Age

24y 10m

Created

05.04.2001

Expires

05.04.2026

Last Updated

22.03.2025

Registrar

Interdominios, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

Alliance

78/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

15/25

1.25x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Alliance

Sans20px

Body Font

Alliance

Sans16px

Contrast Ratio

Reading Comfort

~33 CPL

Needs attention

20px

16px

24px

16px

Major Second

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

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

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

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

6 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(4)assets.adobedtm.com(3)youtube.com(2)cdn.cookielaw.org(2)connect.facebook.net(2)

Website Identity

Facebook Instagram LinkedIn TikTok

Sponsored

Last analyzed: 17 Feb 2026 at 04:03

Historical Analysis & Change Tracking