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

screwfix.com

https://screwfix.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

screwfix.com

Sponsored

Hosting Provider

Btnet

IP Address

81.148.198.11

Server Location

🇬🇧 Barnet, United Kingdom

ASN

AS2856

Organization

Btnet

Server

CloudFront

CDN

CloudFront

Nameservers

ns2.bt.net.ns1.bt.net.ns0.bt.net.

Performance

Page Speed

1.4 MB

112 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Next.js

Infrastructure

Hosting

Btnet

CDN

CloudFront

Technology Stack

7 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Other

Payments

CDN

SEO Analysis

B72/100

screwfix.comscrewfix.com

Screwfix | The UK's Leading Retailer of Trade Tools & Hardware | Sc...

Screwfix: Thousands of products at trade prices | FREE delivery available 7 days a week | FREE click & collect in as little as a minute | Hundreds of stores

Title truncated.

Title Length73 chars

Recommended: 50-60 chars

Description Length156 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

423 rules

Sitemap reference found

Sponsored

Security Score

45%Poor

Critical / Transactional

HTTPS

No WAF

122d

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

19.05.2025

Valid Until

20.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (5)

www.screwfix.comprod.screwfix.commig1.screwfix.commig2.screwfix.comscrewfix.com

SHA-256 Fingerprint

13:92:0E:2C:09:B4:DE:D3:5C:D1:BE:55:3B:3E:3F:E4:D9:AC:D4:CE...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(private, no-cache, no-store, max-age=0, must-revalidate)

content-encoding

📦 Gzip(gzip)

content-security-policy

script-src 'self' *.adalyser.com *.ads-twitter.com *.awin1.c...

content-type

text/html; charset=utf-8

date

Wed, 18 Feb 2026 06:06:43 GMT

etag

"6b86w46a5w4rg5"

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

screwfix-com.mail.protection.outlook.com

Domain Information

screwfix.com

Domain Age

28y 7m

Created

21.07.1997

Expires

09.07.2026

Last Updated

04.07.2025

Registrar

Nom-iq Ltd. dba COM LAUDE

DNSSEC

Not Enabled

Privacy & Compliance

TrustArc

Cookie Consent Banner

TrustArc

GDPR Indicators

Cookie consent banner detected

CMP: TrustArc

Data Protection Officer mentioned

Typography & Readability

archivo_narrowbold + Arial

70/100

Readability

/30

20/40

11px · LH 1.45

Hierarchy

/20

25/25

2.73x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

17/20

System fonts

Heading Font

archivo_narrowbold

Sans30px

Body Font

Arial

Sans11px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

30px

16px

11px

❌ Critical: 11px body text is too small. Increase to at least 14px.

✅ Optimal line spacing: 1.45 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.7x 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 gradient for readability.

Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

ContentsquareEnterprise

User behavior and product analytics

Affiliate & Partnerships

AWINMid-Market

Affiliate networks and partner tracking

A/B Testing & Optimization

OptimizelyEnterprise

Experimentation and conversion optimization

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)googletagmanager.com(3)dwin1.com(1)cdn.optimizely.com(1)js.clrt.ai(1)

Website Identity

Facebook X (Twitter)Instagram YouTube TikTok Threads

Sponsored

Last analyzed: 18 Feb 2026 at 06:06

Historical Analysis & Change Tracking