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Apps & fintechwww.duolingo.com
Duolingo — website check
American online platform for language learning. Duolingo’s website is www.duolingo.com; we did not detect a known CMS or shop platform. It is delivered through Amazon CloudFront. Email from the domain is protected by an enforced DMARC policy.
55
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.
44
Security
40
Speed & delivery
75
Email & domain
55
SEO & markup
Official siteChecked 22 Oct 2026
Built with
Cookie consent (CMP)OneTrust
Tag managersGoogle Tag Manager
JavaScript librarieswebpack
Web serversEnvoy
CAPTCHAGoogle reCAPTCHA
Hosting & delivery
Serverduo-api
Network (AS)Amazon Web Services
HTTP versionHTTP/3
TLSTLS 1.3
CertificateAmazon · valid until 2026-12-24
First response7,733 ms
Homepage weight11 KB
IPv6no
Email & domain
Mail providerGoogle Workspace
SPFyes
DMARC policyp=reject
BIMIyes
DNSSECno
CAAno
Verified servicesAnthropic, Apple (domain verification), Amazon SES / AWS, Google Search Console, Klaviyo, Microsoft 365, OpenAI, Slack
SEO & social
Title8 characters
Meta description148 characters
Canonicalyes
Structured datano
Language versions34
Open Graphyes
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
More apps & fintech brands All
| Brand | Website | Platform | Security | Speed & delivery | Email & domain | SEO & markup | Index |
|---|---|---|---|---|---|---|---|
| Monzo | monzo.com | Contentful | 100 | 40 | 100 | 100 | 91 |
| Patient UK | patient.info | Contentful | 100 | 60 | 100 | 91 | 91 |
| Revolut | www.revolut.com | Next.js | 89 | 80 | 88 | 100 | 91 |
| Starling Bank | www.starlingbank.com | Next.js | 89 | 60 | 75 | 100 | 85 |
| Memrise | www.memrise.com | HubSpot CMS | 100 | 80 | 63 | 82 | 82 |
| Trainline | www.thetrainline.com | — | 89 | 80 | 75 | 82 | 82 |
| Deliveroo | deliveroo.co.uk | Prismic | 78 | 60 | 75 | 91 | 79 |
| Freetrade | freetrade.io | Webflow | 78 | 60 | 75 | 91 | 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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