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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jcyl.es

https://jcyl.es· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

jcyl.es

Sponsored

Hosting Provider

JCyL Network

IP Address

217.71.16.29

Server Location

🇪🇸 Valladolid, Spain

ASN

AS29481

Server

Apache

Nameservers

dns1.jcyl.es.dns2.jcyl.es.ns1.f5clouddns.com.ns2.f5clouddns.com.

Performance

Page Speed

1.5 MB

62 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

JCyL Network

Technology Stack

7 Technologies Detected

CSS Frameworks

Meta Frameworks

Libraries

UI Components

Analytics

Web Servers

SEO Analysis

D55/100

jcyl.esjcyl.es

Página principal de la Junta de Castilla y León | Junta de Castilla...

Página principal de la Junta de Castilla y León

Title truncated.

Title Length74 chars

Recommended: 50-60 chars

Description Length47 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (26/37)

5 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

66 rules

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

260d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Ireland Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

05.11.2025

Valid Until

04.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.jcyl.esjcyl.es

SHA-256 Fingerprint

58:52:B6:CB:58:E4:1D:40:2F:4D:33:16:B1:91:0E:49:44:37:2B:BD...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-store)

connection

content-type

text/html;charset=UTF-8

date

Tue, 17 Feb 2026 17:17:15 GMT

keep-alive

timeout=2, max=99

last-modified

Tue, 17 Feb 2026 17:17:41 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

correo2.jcyl.es

correo1.jcyl.es

Domain Information

jcyl.es

DNSSEC

Not Enabled

Typography & Readability

lora

75/100

Readability

/30

25/40

16px · LH 1.15

Hierarchy

/20

25/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

lora

Serif32px

Body Font

lora

Serif16px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

32px

25px

16px

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

⚠️ Tight line spacing (1.15). Consider 1.4-1.6 for better readability.

✅ Strong hierarchy: Headlines are 2.0x larger than body text.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Cramped layout: 14 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

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)analiticaweb.jcyl.es(1)

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Last analyzed: 17 Feb 2026 at 17:18

Historical Analysis & Change Tracking