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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thebookseller.com

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

Export

thebookseller.com

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

52.31.150.187

Server Location

🇮🇪 Dublin, Ireland

ASN

AS16509

Organization

AWS EC2 (eu-west-1)

Server

Apache

CDN

Cloudflare

WAF

Cloudflare

Nameservers

greg.ns.cloudflare.com.connie.ns.cloudflare.com.

Performance

Page Speed

339 KB

130 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

Cloudflare

Technology Stack

12 Technologies Detected

Libraries

CSS Frameworks

Icon Libraries

Font Awesome Material Icons

Analytics

UI Components

Fonts

Tag Managers

Web Servers

SEO Analysis

C68/100

thebookseller.comthebookseller.com

The Bookseller - The Bookseller | At the heart of publishing since ...

The Bookseller is the incisive and independent source of news and analysis for the book trade and publishing industry. Get breaking news, in-depth features, ...

Title truncated. Description truncated.

Title Length71 chars

Recommended: 50-60 chars

Description Length270 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

robots.txt

76 rules

Sitemap reference found

Sponsored

Security Score

25%Critical

Critical / Transactional

HTTPS

No WAF

257d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.10.2025

Valid Until

04.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.thebookseller.comthebookseller.com

SHA-256 Fingerprint

93:76:97:F6:68:EB:F4:FB:5B:EE:11:B5:F4:F9:53:34:20:AB:27:66...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, no-store, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-language

en-GB

content-security-policy

frame-ancestors 'self' *.affino.com;

content-type

text/html;charset=UTF-8

date

Fri, 20 Feb 2026 07:23:19 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

thebookseller-com.mail.protection.outlook.com

Domain Information

thebookseller.com

Domain Age

28y 8m

Created

24.06.1997

Expires

23.06.2026

Last Updated

10.10.2025

Registrar

IONOS SE

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Typography & Readability

tiemposheadlineregular + PlusJakartaSansRegular

35/100

Readability

/30

32/40

15px · LH 1.40

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

7/20

5 fonts

Heading Font

tiemposheadlineregular

Sans

Body Font

PlusJakartaSansRegular

Sans15px

Contrast Ratio

Reading Comfort

~42 CPL

Needs attention

18px

17px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

⚠️ Performance concern: 5 font families may slow page load.

⚠️ Risky: Text appears on background images without overlay protection.

⚠️ Cramped layout: 84 elements lack adequate spacing.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

drsw10gc90t0z.cloudfront.net(17)applets.ebxcdn.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn YouTube

Sponsored

Last analyzed: 20 Feb 2026 at 07:23

Historical Analysis & Change Tracking