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Shops & marketplaceswww.costco.co.uk
Costco — website check
American multinational chain of membership-only stores, founded 1983, based in Issaquah. Costco’s website (www.costco.co.uk) runs on SAP Commerce Cloud. Email from the domain is protected by an enforced DMARC policy.
52
Brand Web Indexout of 100
Share of 26 technical checks the site passes: security, speed, email and SEO. A measurement of the website — not a popularity ranking.
78
Security
20
Speed & delivery
63
Email & domain
36
SEO & markup
Official siteChecked 22 Oct 2026
About the brand
Facts: Wikidata (CC0).
Built with
E-commerce platformsSAP Commerce Cloud
Tag managersGoogle Tag Manager
Web frameworksAngular
CSS frameworksBootstrap
Web serversEnvoy
CAPTCHAGoogle reCAPTCHA
PaymentsAffirm
Hosting & delivery
Network (AS)Google Cloud
HTTP versionHTTP/3
TLSTLS 1.3
CertificateCertainly · valid until 2026-11-20
First response7,862 ms
Homepage weight1,575 KB
IPv6no
Email & domain
Mail providerProofpoint
SPFyes
DMARC policyp=reject
BIMIno
DNSSECno
CAAno
Verified servicesApple (domain verification), Atlassian Cloud, Cisco Webex, DocuSign, Google Search Console, OneTrust
SEO & social
Title41 characters
Meta descriptionno
Canonicalyes
Structured datano
Language versions0
Open Graphno
AI crawlers & robots
AI crawlers blockednone
llms.txtno
ads.txtno
security.txtno
Checklist
Security
- HTTPS by default
- HSTS header
- TLS 1.3
- Content-Security-Policy
- X-Content-Type-Options
- Referrer-Policy
Speed & delivery
- HTTP/3
- IPv6
- First response under 1.5 s
- Homepage under 1.5 MB
Email & domain
- SPF record
- DMARC record
- DMARC enforced (quarantine / reject)
- BIMI logo record
- DNSSEC
- CAA record
SEO & markup
- Title tag 10–70 characters
- Meta description
- Canonical link
- Exactly one H1
- Structured data (JSON-LD)
- Open Graph title and image
- All images have alt text
- XML sitemap
- robots.txt
- security.txt
More shops & marketplaces brands All
| Brand | Website | Platform | Security | Speed & delivery | Email & domain | SEO & markup | Index |
|---|---|---|---|---|---|---|---|
| ASOS | www.asos.com | Sitecore | 78 | 100 | 88 | 100 | 91 |
| Kingfisher | www.kingfisher.com | Sitecore | 100 | 80 | 75 | 91 | 88 |
| Amplifon | www.amplifon.com | Adobe Experience Manager | 100 | 80 | 63 | 82 | 82 |
| Aldi | www.aldi.co.uk | Nuxt | 100 | 60 | 88 | 64 | 79 |
| Harvey Nichols | www.harveynichols.com | Next.js | 89 | 100 | 63 | 73 | 79 |
| House of Fraser | www.houseoffraser.co.uk | Next.js | 89 | 60 | 88 | 73 | 79 |
| John Lewis | www.johnlewis.com | Next.js | 89 | 40 | 75 | 91 | 79 |
| Londis | www.londis.co.uk | Drupal | 100 | 80 | 63 | 73 | 79 |
Data from our own crawler: homepage, DNS, TLS and robots.txt of each brand’s official website. coolbrands.uk.com is an independent catalogue. It is not affiliated with Superbrands (UK) Ltd or the CoolBrands® awards programme, and does not publish their results.
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