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OnTheMarket

Home & designwww.onthemarket.com

OnTheMarket — website check

British residential property search web portal, based in London. OnTheMarket’s website (www.onthemarket.com) runs on Next.js. It is delivered through Amazon CloudFront. Email from the domain is protected by an enforced DMARC policy.

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.

Security

Speed & delivery

Email & domain

SEO & markup

Official siteChecked 22 Oct 2026

About the brand

CountryUnited Kingdom

HeadquartersLondon

Part ofCoStar Group

Official websitewww.onthemarket.com

Facts: Wikidata (CC0).

Built with

CDNAmazon CloudFront

Web frameworksNext.js React

CSS frameworksTailwind CSS

Hosting & delivery

Network (AS)Amazon Web Services

HTTP versionHTTP/3

TLSTLS 1.3

CertificateAmazon · valid until 2027-03-06

First response1,232 ms

Homepage weight184 KB

IPv6no

Email & domain

Mail providerMicrosoft 365

SPFyes

DMARC policyp=quarantine

BIMIyes

DNSSECno

CAAno

Verified servicesAdobe (Admin Console), Apple (domain verification), Atlassian Cloud, Canva, Figma, Google Search Console, KnowBe4, Microsoft 365

SEO & social

Title57 characters

Meta description152 characters

Canonicalyes

Structured dataProduct

Language versions0

Open Graphyes

Social profiles linkedFacebook, Instagram, Tiktok, X, Youtube

AI crawlers & robots

AI crawlers blockednone

llms.txtno

ads.txtyes

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

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Persimmon	www.persimmonhomes.com	—	89	80	38	91	76
Redrow	www.redrow.co.uk	Sitecore	100	40	63	82	76
Royal Doulton	www.royaldoulton.com	Shopify	89	100	63	64	76

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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