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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seat61.com

https://seat61.com· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

seat61.com

Sponsored

Hosting Provider

SDG Customer WAN

IP Address

185.120.152.58

Server Location

🇬🇧 Shrewsbury, United Kingdom

ASN

AS6908

Organization

SDG Customer WAN

Server

Apache

Nameservers

pns22.cloudns.net.pns21.cloudns.net.ns22.cloudns.net.ns21.cloudns.net.

Performance

Page Speed

1017 KB

47 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Technology Stack

12 Technologies Detected

Advertising

Google Ads Google AdSense Criteo Taboola Outbrain

Analytics

Libraries

CSS Frameworks

Icon Libraries

Fonts

Web Servers

SEO Analysis

B70/100

seat61.comseat61.com

The Man in Seat 61 | The train travel guide

A guide to train travel in the UK, Europe & worldwide. Train times, fares, how to buy tickets, tips & advice.

Title Length43 chars

Recommended: 50-60 chars

Description Length110 chars

Recommended: 120-160 chars

Issues (1)

• Missing viewport meta tag - page may not be mobile-friendly

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

11 rules

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

65d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

25.03.2025

Valid Until

26.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.seat61.comseat61.com

SHA-256 Fingerprint

BC:A1:5D:5C:4D:8E:52:91:17:AC:B0:54:1C:8E:75:37:0E:5A:BC:F1...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟢 1 Month(max-age=2592000)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

14552

content-type

text/html

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

seat61.com

Domain Information

seat61.com

Domain Age

24y 11m

Created

21.03.2001

Expires

21.03.2026

Last Updated

22.03.2025

Registrar

IONOS SE

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

Impact + Verdana

71/100

Readability

/30

30/40

23px · LH --

Hierarchy

/20

18/25

2.11x ratio

WCAG

/25

11/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

Impact

Display48px

Body Font

Verdana

Sans23px

Contrast Ratio

Reading Comfort

~54 CPL

Optimal (45–75)

48px

23px

24px

21px

23px

✅ Excellent readability: 23px body text is ideal for all devices.

✅ Strong hierarchy: Headlines are 2.1x larger than body text.

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

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

✅ Protected text on images: Using text-shadow for readability.

✅ Optimal line length: ~54 characters per line is comfortable to read.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.adfirst.media(2)securepubads.g.doubleclick.net(2)googletagmanager.com(2)apis.google.com(2)pagead2.googlesyndication.com(2)

Website Identity

Facebook X (Twitter)YouTube

Sponsored

Last analyzed: 20 Feb 2026 at 09:52

Historical Analysis & Change Tracking