What powers opengl-tutorial.org?
Last seen Aug 2026 · 5 technologies across 4 categories
Analytics
Caching
Varnish
since Jun 2018
CDN
Fastly
since Jan 2016
GitHub Pages
since Jan 2016
Mailgun
since May 2024
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 80% desktop
- 20% phone
United States
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.71 / 10 · ranked #305,348 of all domains
116 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- CDN: Fastly
- Weight: 0.2 MB · 8 requests
Homepage as crawled by the HTTP Archive, Sep 2026.