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

asda.com

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

Export

asda.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.64.144.235

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jihoon.ns.cloudflare.com.dora.ns.cloudflare.com.

Performance

Page Speed

1.1 MB

197 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Headless

⚙️ SSR

Decoupled

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Detected API Sources

//cdn-eu.dynamicyield.com/api/...

Technology Stack

11 Technologies Detected

Advertising

Google Ads Criteo Taboola

CSS Frameworks

Analytics

Frameworks

Tag Managers

Personalization

CDN

SEO Analysis

C68/100

asda.comasda.com

Online Food Shopping - ASDA Groceries

Shop online at ASDA Groceries. The same great prices as in store, delivered to your door or click and collect from store.

Title Length37 chars

Recommended: 50-60 chars

Description Length121 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

robots.txt

19 rules

Sponsored

A+

Security Score

91%Excellent

Interactive

HTTPS

WAF

251d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

24.09.2025

Valid Until

26.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (9)

asda.comcommerce.asda.comcorporate.asda.comghs-mm.asda.comgroceries.asda.comlogin.asda.comsupport.asda.comwww.asda.com+1 more

SHA-256 Fingerprint

51:AC:57:CF:E9:F2:CA:F5:82:61:40:CF:E9:F5:CA:67:22:42:AE:4C...

Upgrade to view header details

HTTP Headers

Developer Console

date

Mon, 16 Feb 2026 15:04:55 GMT

content-type

text/html; charset=utf-8

content-encoding

📦 Gzip(gzip)

cf-ray🇩🇪 Frankfurt

9cedf0b2fe7692b1-FRA

cf-cache-status

BYPASS

age

118

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

mxb-000c7201.gslb.pphosted.com

mxa-000c7201.gslb.pphosted.com

Domain Information

asda.com

Domain Age

27y 7m

Created

03.07.1998

Expires

02.07.2026

Last Updated

08.09.2025

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

-apple-system + sans-serif

51/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

-apple-system

Sans

Body Font

sans-serif

Sans16px

Contrast Ratio

Reading Comfort

~60 CPL

Optimal (45–75)

24px

22px

14px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

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

✅ Optimal line length: ~60 characters per line is comfortable to read.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)assets.adobedtm.com(4)cdn-ukwest.onetrust.com(3)cdn-eu.dynamicyield.com(2)cdn.decibelinsight.net(1)

Website Identity

asda.com

27 years old

MarkMonitor Inc.

Social Profiles

Facebook X (Twitter)Instagram Pinterest

Sponsored

Last analyzed: 16 Feb 2026 at 15:05

Historical Analysis & Change Tracking