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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eurostar.com

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

Export

eurostar.com

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

76.223.34.124

Server Location

🇺🇸 Seattle, United States

ASN

AS16509

Organization

AWS Global Accelerator (GLOBAL)

CDN

Fastly

Nameservers

ns-785.awsdns-34.net.ns-1442.awsdns-52.org.ns-1583.awsdns-05.co.uk.ns-419.awsdns-52.com.

Performance

Page Speed

560 KB

127 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Sanity

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Fastly

Detected API Sources

https://cdn.sanity.io/images/1...

Technology Stack

7 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Advertising

Microsoft Advertising

Security

reCAPTCHA

SEO Analysis

A88/100

eurostar.comeurostar.com

Eurostar.com: Book Europe Train Tickets and Holidays

Eurostar Official Website. Book your train tickets to London, Paris, Brussels, Amsterdam, Cologne and many more European destinations with Eurostar.

Title Length52 chars

Recommended: 50-60 chars

Description Length148 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (31/39)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

10 URLs

robots.txt

23 rules

Sitemap reference found

Sponsored

Security Score

65%Fair

Critical / Transactional

HTTPS

No WAF

82d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

10.02.2026

Valid Until

11.05.2026

Subject Alternative Names (1)

www.eurostar.com

SHA-256 Fingerprint

FC:73:29:10:40:51:7C:95:69:2A:C6:7C:8D:1B:15:91:05:AF:95:94...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

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HTTP Headers

Developer Console

accept-ranges

bytes

age

201

cache-control

🔴 No Cache(no-store)

content-encoding

📦 Gzip(gzip)

content-length

97776

content-security-policy

default-src 'self' https://static.eurostar.com https://www.e...

Good Warning Issue

Email Infrastructure

Mimecast

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

eu-smtp-inbound-1.mimecast.com

eu-smtp-inbound-2.mimecast.com

Domain Information

eurostar.com

Domain Age

30y 7m

Created

10.07.1995

Expires

09.07.2026

Last Updated

04.06.2025

Registrar

Amazon Registrar, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Didomi

Cookie Consent Banner

Didomi

GDPR Indicators

Cookie consent banner detected

CMP: Didomi

Data Protection Officer mentioned

Typography & Readability

Arial + sans-serif

67/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

13/25

1.75x ratio

WCAG

/25

11/15

Contrast: undefined

Performance

/25

10/20

4 fonts

Heading Font

Arial

Sans28px

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

28px

22px

16px

✅ Excellent readability: 16px 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.

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

⚠️ Cramped layout: 15 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)hosted-scripts.eurostar.com(2)gstatic.com(1)eus.cdn-v3.conductrics.com(1)c9e4474cd947.eu-west-1.captcha-sdk.awswaf.com(1)

Website Identity

eurostar.com

30 years old

Amazon Registrar, Inc.📧 Mimecast

Social Profiles

Facebook X (Twitter)Instagram LinkedIn YouTube TikTok

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Last analyzed: 17 Feb 2026 at 14:15

Historical Analysis & Change Tracking