What powers songho.ca?
Last seen Aug 2026 · 5 technologies across 5 categories
Advertising
Cookie compliance
Miscellaneous
Security
Web Servers
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
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| 2d convolution | #2 | 52 |
| homogeneous coordinates | #6 | 30 |
| opengl projection matrix | #1 | 27 |
| opengl | #22 | 27 |
| quaternions | #43 | 13 |
| opengl sphere | #1 | 12 |
| exponential taylor series | #8 | 12 |
| 2d convolution equation | #1 | 12 |
| opengl perspective matrix | #1 | 9 |
| opengl camera | #2 | 8 |
| taylor series of exponential | #10 | 7 |
| e ix graph | #3 | 7 |
| quaternion to rotation matrix | #7 | 6 |
| plane formula | #30 | 6 |
| graph of e | #17 | 6 |
| projection matrix formula | #10 | 5 |
| sphere opengl | #1 | 4 |
| orthographic projection matrix | #7 | 4 |
| normal vector of a plane | #47 | 3 |
| exponential function taylor series | #9 | 3 |
| taylor expansion of exponential function | #11 | 2 |
| transformation matrix for perspective projection | #5 | 2 |
| quaternions and rotations | #44 | 2 |
| quaternion definition | #30 | 2 |
| series of e | #10 | 2 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Audience
- 72% desktop
- 28% phone
United States
India
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.93 / 10 · ranked #114,478 of all domains
104 referring domains · OpenPageRank
Search traffic
310 est. monthly organic visits (US)
336 keywords in Google's top 30
Core Web Vitals
| LCP | 1.5 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 1000 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- Weight: 0.4 MB · 37 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on IMH-IAD (144.208.79.224)
- Email: emailowl.com
- Email security: SPF (hard fail), DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 429,604, 2 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.songho.ca | 5 |
| songho.ca | 1 |
Full technology history →
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Recent changes
- dropped Google Font API Mar 2026
- detected Google Font API Jan 2026
- dropped Google Font API Nov 2025