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

visitlondon.com

https://visitlondon.com· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

visitlondon.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.66.0.120

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns1-08.azure-dns.com.ns2-08.azure-dns.net.ns3-08.azure-dns.org.ns4-08.azure-dns.info.

Performance

Page Speed

1.1 MB

54 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

HubSpot CMS

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

12 Technologies Detected

Analytics

Libraries

Other

CSS Frameworks

Tag Managers

Marketing

Advertising

Other

Payments

CDN

Customer Support

SEO Analysis

A84/100

visitlondon.comvisitlondon.com

Visit London - We are London's Official Visitor Guide

Discover your ultimate guide to London. From the best activities in the city to top restaurants, bars and hotels, explore what's on in London today.

Title Length53 chars

Recommended: 50-60 chars

Description Length148 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (71/103)

1 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

30 rules

Sitemap reference found

Sponsored

Security Score

75%Good

Critical / Transactional

HTTPS

WAF

59d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

17.01.2026

Valid Until

17.04.2026

Subject Alternative Names (1)

www.visitlondon.com

SHA-256 Fingerprint

F4:34:CE:A8:0A:37:25:15:EB:41:7C:43:3A:EA:5C:11:71:C7:FB:9A...

Upgrade to view header details

HTTP Headers

Developer Console

accept-ch

Sec-CH-UA-Full-Version-List,Sec-CH-UA-Platform-Version,Sec-C...

alt-svc

h3=":443"; ma=86400

cache-control

🟣 Private(private)

cf-cache-status

DYNAMIC

cf-ray🇩🇪 Frankfurt

9ceece005825db12-FRA

content-encoding

⚡ Brotli(br)

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

visitlondon-com.mail.protection.outlook.com

Domain Information

visitlondon.com

Domain Age

27y 3m

Created

02.11.1998

Expires

01.11.2026

Last Updated

02.10.2025

Registrar

Nom-iq Ltd. dba COM LAUDE

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Legitimate interest basis mentioned

Typography & Readability

Times New Roman + sans-serif

89/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

25/25

2.13x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Times New Roman

Serif32px

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

32px

24px

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 2.1x larger than body text.

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

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

7 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

HotjarMid-Market

Matomo (Piwik)Mid-Market

KissmetricsMid-Market

User behavior and product analytics

Privacy & Cookies

CookiebotMid-Market

Cookie consent and privacy compliance tools

A/B Testing & Optimization

ConvertMid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(3)consent.cookiebot.com(2)youtube.com(2)securepubads.g.doubleclick.net(2)unpkg.com(1)

Website Identity

visitlondon.com

27 years old

Nom-iq Ltd. dba COM LAUDE📧 Microsoft 365

Social Profiles

Facebook X (Twitter)Instagram LinkedIn TikTok Pinterest

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Last analyzed: 16 Feb 2026 at 17:36

Historical Analysis & Change Tracking