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

historicengland.org.uk

https://historicengland.org.uk· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

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Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.18.10.158

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jean.ns.cloudflare.com.alexis.ns.cloudflare.com.

Performance

Page Speed

3.2 MB

161 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Technology Stack

10 Technologies Detected

Fonts

Adobe Fonts (Typekit)Adobe Fonts

Analytics

UI Components

CSS Frameworks

Tag Managers

Advertising

CDN

Frameworks

SEO Analysis

B76/100

historicengland.org.ukhistoricengland.org.uk

Historic England - Championing England's heritage | Historic England

No description available for this page.

Title Length68 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

3 issues found

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Crawlability

Sitemap

robots.txt

21 rules

Sitemap reference found

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Security Score

81%Very Good

Interactive

HTTPS

WAF

54d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

13.01.2026

Valid Until

13.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

historicengland.org.uk*.historicengland.org.uk

SHA-256 Fingerprint

7C:AB:23:A9:99:C6:45:39:A6:56:8D:27:5E:73:FD:78:A5:4F:4A:E9...

Upgrade to view header details

HTTP Headers

Developer Console

date

Tue, 17 Feb 2026 09:17:05 GMT

content-type

text/html; charset=utf-8

speculation-rules

"/cdn-cgi/speculation"

server

cloudflare

content-security-policy-report-only

script-src 'none'; report-uri https://csp-reporting.cloudfla...

vary

Accept-Encoding

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

historicengland-org-uk.mail.protection.outlook.com

Domain Information

historicengland.org.uk

DNSSEC

Not Enabled

Privacy & Compliance

Civic Cookie Control

Cookie Consent Banner

Civic Cookie Control

GDPR Indicators

Cookie consent banner detected

CMP: Civic Cookie Control

Typography & Readability

tahoma

64/100

Readability

/30

40/40

18px · LH 1.50

Hierarchy

/20

8/25

1x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

tahoma

Sans18px

Body Font

tahoma

Sans18px

Contrast Ratio

Reading Comfort

~81 CPL

Needs attention

18px

48px

28px

18px

Golden Ratio

Scale

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

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

AAdobe Fonts Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Crazy EggSMB

Google AnalyticsFree

User behavior and product analytics

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Scripts & Styles

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)script.crazyegg.com(2)amplify.outbrain.com(1)googletagmanager.com(1)cc.cdn.civiccomputing.com(1)

Website Identity

historicengland.org.uk

📧 Microsoft 365

Social Profiles

Facebook X (Twitter)Instagram

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Last analyzed: 17 Feb 2026 at 09:17

Historical Analysis & Change Tracking