What powers 21.co.uk?
Last seen Jun 2026 · 31 technologies across 19 categories
Analytics
Google Analytics
since Jun 2018
CDN
Cloudflare
since Sep 2021
Google Cloud CDN
since Apr 2022
Documentation
Zendesk
since Sep 2021
IaaS
Google Cloud
since Jan 2020
Issue trackers
Cloudflare Network Error Logging
since Feb 2022
JavaScript frameworks
JavaScript libraries
Load balancers
Amazon ALB
since Sep 2021
Miscellaneous
PaaS
Amazon Web Services
since Sep 2021
Netlify
since Feb 2022
Programming languages
Reverse proxies
Envoy
since Dec 2021
RUM
Datadog
since Mar 2024
Security
Tag managers
Google Tag Manager
since Jun 2018
UI frameworks
MUI
since Mar 2024
Web frameworks
Ruby on Rails
since Sep 2021
Web servers
Nginx
since Oct 2018
Webmail
Google Workspace
since Aug 2022
Audience
- 87% phone
- 12% desktop
United Kingdom
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
3.87 / 10 · ranked #679,185 of all domains
114 referring domains · OpenPageRank
Core Web Vitals
| LCP | 3 s |
| INP | 275 ms |
| CLS | 0.45 |
| TTFB | 1400 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: English
- CDN: Incapsula
- Weight: 2.0 MB · 225 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| help.21.co.uk | 17 |
| www.21.co.uk | 16 |
| promo.21.co.uk | 8 |
Full technology history →
Report an incorrect detection
Recent changes
- dropped HTTP/3 Mar 2026
- dropped Priority Hints Sep 2025