What powers c21.be?
Last seen Aug 2026 · 15 technologies across 11 categories
Mailjet
since Aug 2022
Font scripts
Google Font API
since Apr 2020
JavaScript frameworks
Miscellaneous
Open Graph
since Sep 2022
Webpack
since Mar 2023
Operating systems
Ubuntu
since Mar 2023
Programming languages
Node.js
since Mar 2023
Reviews
Trustpilot
since Dec 2023
Surveys
Tally
since Jul 2026
UI frameworks
Web servers
Webmail
Microsoft 365
since Aug 2022
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Aug 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 80% phone
- 20% desktop
Belgium
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.89 / 10 · ranked #14,759,423 of all domains
2 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.4 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Dutch
- Weight: 10.7 MB · 46 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Subdomains
| Host | Techs |
|---|---|
| c21.be | 15 |
| www.c21.be | 15 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Tally Jul 2026
- dropped DigitalOcean Spaces Jan 2026
- dropped Lodash Jan 2026