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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publico.es

https://publico.es· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

publico.es

Mobile

Sponsored

Hosting Provider

IONOS (1&1)

ionos.com

IP Address

82.165.10.16

Server Location

🇪🇸 Madrid, Spain

ASN

AS8560

Organization

Es Lgr Pl Ionos Cloud Vit

CDN

CloudFront

Nameservers

ns1098.ui-dns.biz.ns1078.ui-dns.org.ns1016.ui-dns.com.ns1074.ui-dns.de.

Performance

Page Speed

1.4 MB

71 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

Frontend

Styling

Tailwind CSS

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

IONOS (1&1)

CDN

CloudFront

Detected API Sources

https://id-eu.piano.io/id/api/...

Technology Stack

10 Technologies Detected

Analytics

Advertising

Meta Frameworks

Libraries

CSS Frameworks

Fonts

Tag Managers

Customer Support

SEO Analysis

A84/100

publico.espublico.es

Diario Público | El medio progresista

Noticias de última hora, política, economía, cultura, mujer, opinión e investigación en Publico, diario progresista. Dirigido por Manuel Rico

Title Length37 chars

Recommended: 50-60 chars

Description Length141 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

503 URLs

robots.txt

160 rules

Allows all crawlers

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

139d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

04.06.2025

Valid Until

03.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (4)

publico.es*.diaripublic.cat*.publico.esdiaripublic.cat

SHA-256 Fingerprint

03:CD:B6:C7:23:8B:D4:2D:FD:47:84:EA:04:75:30:DB:4C:99:1C:B8...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

alt-svc

h3=":443"; ma=86400

cache-control

🟡 60s(max-age=60, must-revalidate, stale-if-error=86400, stale-whi...)

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

MX Records (1)

publico-es.mail.protection.outlook.com

Domain Information

publico.es

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

Publico + Libre Franklin

73/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

2.93x ratio

WCAG

/25

11/15

Contrast: undefined

Performance

/25

10/20

4 fonts

Heading Font

Publico

Sans44px

Body Font

Libre Franklin

Sans15px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

44px

32px

19px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.9x larger than body text.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ Cramped layout: 114 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Reviews & Social Proof

TrustpilotMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(4)cdn.cxense.com(2)static.chartbeat.com(2)sdk.privacy-center.org(2)s3.eu-central-1.amazonaws.com(2)

Website Identity

Facebook X (Twitter)Instagram YouTube TikTok Bluesky

Sponsored

Last analyzed: 14 Feb 2026 at 10:18

Historical Analysis & Change Tracking