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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uc3m.es

https://uc3m.es· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

uc3m.es

Sponsored

Hosting Provider

Altia Consultores S.A.

IP Address

176.58.10.138

Server Location

🇪🇸 Oleiros, Spain

ASN

AS57656

Organization

Altia Consultores S.A.

Server

Apache

Nameservers

vorteX.uc3m.es.chico.rediris.es.sun.rediris.es.saruman.uc3m.es.

Performance

Page Speed

8.1 MB

78 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Directus

Infrastructure

Hosting

Altia Consultores S.A.

Detected API Sources

https://podcast.uc3m.es/items/...

Technology Stack

6 Technologies Detected

Analytics

Libraries

CSS Frameworks

Tag Managers

Web Servers

SEO Analysis

C64/100

uc3m.esuc3m.es

Home | UC3M

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

124 URLs

robots.txt

66 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

261d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

05.11.2025

Valid Until

05.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

uc3m.eswww.uc3m.es

SHA-256 Fingerprint

0A:AF:63:09:53:ED:4C:12:DF:B5:A3:00:24:4F:FB:30:5C:0E:A2:7C...

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

464

content-type

text/html; charset=UTF-8

date

Mon, 16 Feb 2026 17:56:25 GMT

etag

"3b4-5553cda837400-gzip"

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

ASPMX.L.GOOGLE.COM

ALT4.ASPMX.L.GOOGLE.COM

ALT3.ASPMX.L.GOOGLE.COM

ALT1.ASPMX.L.GOOGLE.COM

+1 more

Domain Information

uc3m.es

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Alata Regular + Trebuchet MS

65/100

Readability

/30

25/40

28px · LH 0.80

Hierarchy

/20

15/25

1.21x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Alata Regular

Sans34px

Body Font

Trebuchet MS

Sans28px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

34px

28px

✅ Excellent readability: 28px body text is ideal for all devices.

⚠️ Tight line spacing (0.80). Consider 1.4-1.6 for better readability.

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

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

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(2)gstatic.com(1)local(1)google.com(1)

Website Identity

Facebook X (Twitter)Instagram TikTok

Sponsored

Last analyzed: 16 Feb 2026 at 17:56

Historical Analysis & Change Tracking