What powers pressbooks.directory?
Last seen Aug 2026 · 10 technologies across 9 categories
Analytics
CDN
Ecommerce
JavaScript frameworks
Load balancers
Miscellaneous
PaaS
Performance
UI frameworks
AI Crawlers
Blocks 8 of 33 AI crawlers we track by name in its robots.txt. Checked Sep 2026.
Training crawlers
- Applebot-Extended Blocked
- Bytespider Blocked
- CCBot Blocked
- ClaudeBot Blocked
- Google-Extended Blocked
- GPTBot Blocked
- meta-externalagent Blocked
Search and AI assistants
- Amazonbot Blocked
The other 25 AI crawlers we track are not mentioned and stay allowed by default.
- robots.txt found
- llms.txt not found
- ai.txt not found
Content Signals:
search=yes ai-train=no declared in robots.txt
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| press and books | #2 | 15 |
| psu books | #32 | 9 |
| the directory | #42 | 4 |
| pressbooks | #38 | 4 |
| pressbooks | #38 | 4 |
| press books | #20 | 4 |
| iu pressbooks | #5 | 4 |
| ucf pressbooks | #3 | 3 |
| press books | #50 | 3 |
| lab manual | #85 | 3 |
| wistech open | #6 | 2 |
| rebus community | #4 | 2 |
| social work textbooks | #9 | 2 |
| language of composition book | #62 | 2 |
| lifespan human development a topical approach | #4 | 2 |
| bc open textbooks | #8 | 1 |
| textbook publishers | #73 | 1 |
| the home lab a photo guide for anatomy | #38 | 1 |
| vet textbooks | #56 | 1 |
| uw pressbooks | #7 | 1 |
| iu pressbooks | #13 | 1 |
| john jay textbooks | #14 | 1 |
| how to cite a lab manual | #66 | 1 |
| developmental psychology textbooks | #39 | 1 |
| development psychology textbook | #49 | 1 |
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
8 of 33 AI crawlers blocked
Standards: Content Signals
Audience
- 72% desktop
- 28% phone
United States
Canada
India
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.50 / 10 · ranked #158,938 of all domains
209 referring domains · OpenPageRank
Search traffic
78 est. monthly organic visits (US)
184 keywords in Google's top 30
Core Web Vitals
| LCP | 1.5 s |
| INP | 2150 ms |
| CLS | 0.2 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- Weight: 0.7 MB · 27 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Full technology history →
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Recent changes
- detected Cart Functionality Aug 2026
- dropped Nginx Aug 2026
- dropped Amazon CloudFront Oct 2025
- dropped Amazon S3 Oct 2025
- dropped Google Analytics Oct 2025