What powers 21cacademy.org?
Last seen Jun 2026 · 31 technologies across 15 categories
Analytics
Cloudflare Browser Insights
since Jul 2024
Google Analytics
since Jul 2024
CDN
cdnjs
since Jul 2024
Cloudflare
since Jul 2024
Databases
Editors
Font scripts
Google Font API
since Jul 2024
Hosting
GoDaddy
since Jul 2024
JavaScript frameworks
Backbone.js
since Jul 2024
Stimulus
since Mar 2026
JavaScript libraries
Htmx
since Nov 2025
libphonenumber
since Jun 2025
Lightbox
since Jul 2024
Preact
since Jul 2024
Selectize
since Jul 2024
Underscore.js
since Jul 2024
Miscellaneous
HTTP/3
since Jul 2024
Open Graph
since Jul 2024
Programming languages
Java
since Jul 2024
Security
HSTS
since Jul 2024
Tag managers
Google Tag Manager
since Jul 2024
Translation
Weglot
since Jul 2024
Video players
Webmail
Microsoft 365
since Jul 2024
Audience
- 65% phone
- 35% desktop
United States
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
1.42 / 10 · ranked #7,242,947 of all domains
4 referring domains · OpenPageRank
Core Web Vitals
| LCP | 3.3 s |
| INP | 100 ms |
| CLS | 0.35 |
| TTFB | 2200 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: English (United States)
- CDN: Cloudflare
- Weight: 4.1 MB · 103 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.
Full technology history →
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