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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historyextra.com

https://historyextra.com· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

historyextra.com

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.129.91

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

CDN

Fastly

Nameservers

ns1.imdserve.com.ns3.imdserve.com.ns5.imdserve.com.ns6.imdserve.com.+2 more

Performance

Page Speed

1.3 MB

99 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Next.js

CMS

Strapi

Infrastructure

Hosting

Fastly, Inc.

CDN

Fastly

Technology Stack

10 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Fonts

Adobe Fonts (Typekit)

Tag Managers

Advertising

Reviews

Security

SEO Analysis

C67/100

historyextra.comhistoryextra.com

HistoryExtra | Home of Britain’s bestselling history magazine and p...

Thousands of historical articles on both British and world history for all levels of knowledge and interest.

Title truncated.

Title Length88 chars

Recommended: 50-60 chars

Description Length108 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

152 URLs

robots.txt

42 rules

Sitemap reference found

Sponsored

Security Score

61%Fair

Interactive

HTTPS

No WAF

170d

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/2

Valid From

08.07.2025

Valid Until

09.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

*.api.immediate.co.uk*.bbcgoodfood.com*.feature.bbcgoodfood.com*.feature.gardenersworld.com*.feature.historyextra.com*.feature.im-slate.com*.feature.immediate.co.uk*.feature.madeformums.com+12 more

SHA-256 Fingerprint

FE:CE:3C:55:2A:5D:8E:11:87:D9:72:5A:45:6B:72:87:F6:D9:08:D1...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

327

backend

https://content-resolution-service-production.headless.imdse...

cache-control

🟡 0s(public, max-age=0, s-maxage=900, stale-while-revalidate=8640...)

content-encoding

📦 Gzip(gzip)

Good Warning Issue

Email Infrastructure

Mimecast

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

eu-smtp-inbound-1.mimecast.com

eu-smtp-inbound-2.mimecast.com

Domain Information

historyextra.com

Domain Age

15y 3m

Created

12.11.2010

Expires

12.11.2026

Last Updated

13.10.2025

Registrar

Lexsynergy Limited

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Didot + Helvetica Neue

89/100

Readability

/30

40/40

16px · LH 1.63

Hierarchy

/20

21/25

2.25x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Didot

Serif36px

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

36px

16px

19px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.62 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

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

⚠️ Cramped layout: 63 elements lack adequate spacing.

AAdobe Fonts 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

24 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)googletagmanager.com(3)use.typekit.net(1)datadoghq-browser-agent.com(1)cdn.speedcurve.com(1)

Website Identity

Facebook X (Twitter)Instagram

Sponsored

Last analyzed: 19 Feb 2026 at 13:38

Historical Analysis & Change Tracking