What powers 
psychtoolbox.org?
Last seen Mar 2026 · 12 technologies across 8 categories
CDN
GitHub Pages
since Jun 2017
jsDelivr
since Jul 2020
Font Scripts
Google Font API
since Aug 2018
Miscellaneous
RSS
since Dec 2022
Operating Systems
UNIX
since Aug 2018
Programming Languages
Web frameworks
Ruby on Rails
since Jun 2018
Web Server Extensions
Web Servers
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 100% desktop
United States
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.69 / 10 · ranked #332,392 of all domains
89 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Aug 2026.
Infrastructure
- Hosted on Fastly (185.199.108.153)
- DNS: Register.com
- Email: no MX record returned
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 70,255, 3 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| docs.psychtoolbox.org | 7 |
| psychtoolbox.org | 3 |
| www.psychtoolbox.org | 3 |