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

isciii.es

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

Export

isciii.es

Sponsored

Hosting Provider

Carlos III

IP Address

212.128.123.144

Server Location

🇪🇸 Madrid, Spain

ASN

AS200521

Organization

Carlos III

Nameservers

ns2.age.gob.es.ns1.age.gob.es.

Performance

Page Speed

14.5 MB

143 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

Infrastructure

Hosting

Carlos III

Technology Stack

5 Technologies Detected

Frameworks

Libraries

CSS Frameworks

Icon Libraries

Analytics

SEO Analysis

D58/100

isciii.esisciii.es

Instituto de Salud Carlos III. - ISCIII Portal Web

No description available for this page.

Title Length50 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 (43/52)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

182 URLs

robots.txt

9 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

277d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

FNMT-RCM

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

21.11.2025

Valid Until

21.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.isciii.esisciii.es

SHA-256 Fingerprint

F9:A3:69:63:AB:78:1F:D1:EF:54:B8:FB:EC:09:AD:A2:B1:99:AE:7A...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(private, no-cache, no-store, must-revalidate)

connection

keep-alive

content-type

text/html;charset=UTF-8

date

Tue, 17 Feb 2026 00:52:53 GMT

expires

Thu, 01 Jan 1970 00:00:00 GMT

keep-alive

timeout=20

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mxa-006a4e02.gslb.pphosted.com

mxb-006a4e02.gslb.pphosted.com

Domain Information

isciii.es

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer mentioned

Typography & Readability

Red Hat Display

77/100

Readability

/30

40/40

25px · LH 1.50

Hierarchy

/20

16/25

1.92x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Red Hat Display

Sans48px

Body Font

Red Hat Display

Sans25px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

48px

40px

32px

25px

✅ Excellent readability: 25px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and 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.

✅ Protected text on images: Using gradient for readability.

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

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(8)analytics.isciii.es(1)isciii.es(1)

Website Identity

X (Twitter)Instagram LinkedIn YouTube Bluesky

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Last analyzed: 17 Feb 2026 at 00:53

Historical Analysis & Change Tracking