What powers 
libretexts.org?
Last seen Oct 2026 · 91 technologies across 28 categories
Analytics
CDN
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Fundraising & donations
JavaScript Frameworks
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Operating systems
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Performance
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Reverse proxies
RUM
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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 Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| libretext | #1 | 820 |
| free textbooks online | #3 | 430 |
| google textbooks | #19 | 370 |
| free textbook pdf | #4 | 290 |
| website for free textbooks | #4 | 240 |
| where to find free textbooks online | #3 | 230 |
| where to find free textbooks | #3 | 230 |
| free textbook downloads | #3 | 230 |
| download textbooks for free | #3 | 180 |
| chemistry libretexts | #2 | 160 |
| edfinity | #8 | 160 |
| free online textbooks | #3 | 130 |
| chem libretexts | #2 | 120 |
| where to get free textbooks | #5 | 110 |
| where to get free online textbooks | #5 | 110 |
| openstax | #37 | 100 |
| textbooks | #12 | 100 |
| online textbooks free | #2 | 71 |
| free booklets | #77 | 70 |
| textbook finder | #4 | 58 |
| davis library | #84 | 57 |
| free books | #71 | 53 |
| open textbook library | #10 | 50 |
| libre text | #1 | 49 |
| free textbook | #2 | 48 |
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
- 61% desktop
- 35% phone
- 4% tablet
United States
Canada
Mexico
India
Philippines
United Kingdom
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.08 / 10 · ranked #6,153 of all domains
3,532 referring domains · OpenPageRank
Search traffic
6,200 est. monthly organic visits (US)
2,036 keywords in Google's top 30
Core Web Vitals
| LCP | 2.9 s |
| INP | 75 ms |
| CLS | 0.15 |
| TTFB | 1200 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- CDN: Cloudflare
- Weight: 5.0 MB · 112 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
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- odoo-community.org 4 shared
- uems.eu 4 shared
openpolis.it 4 sharedfilmfest-muenchen.de 4 shared
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- Libretexts
- Country: United States
From the homepage's own structured data (Oct 2026) and Wikidata (CC0).
Infrastructure
- Registered Jul 2016 (10 years) via Squarespace Domains II LLC, renews Jul 2027
- Hosted on Cloudflare (104.20.33.226, IPv6)
- DNS: Cloudflare DNS
- Email: Google Workspace
- Email security: SPF (soft fail), DMARC quarantine, DNSSEC signed, CAA
- SSL: Google Trust Services, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 4,685, 102 hosts
- Verified with: 1Password, Atlassian, Google, Microsoft 365
DNS records as swept Oct 2026, certificate as seen Oct 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| ukrayinska.libretexts.org | 32 |
| query.libretexts.org | 31 |
| adapt-promo.libretexts.org | 30 |
| bio.libretexts.org | 29 |
| biz.libretexts.org | 29 |
| chem.libretexts.org | 29 |
| eng.libretexts.org | 29 |
| espanol.libretexts.org | 29 |
| geo.libretexts.org | 29 |
| human.libretexts.org | 29 |
| k12.libretexts.org | 29 |
| math.libretexts.org | 29 |
| phys.libretexts.org | 29 |
| workforce.libretexts.org | 29 |
| med.libretexts.org | 28 |
| socialsci.libretexts.org | 28 |
| stats.libretexts.org | 28 |
| status.libretexts.org | 20 |
| blog.libretexts.org | 18 |
| libretexts.org | 18 |
| commons.libretexts.org | 15 |
| oeri.commons.libretexts.org | 15 |
| academy.libretexts.org | 14 |
| adapt.libretexts.org | 13 |
Full technology history →
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Recent changes
- dropped Cloudflare Bot Management Sep 2026
- detected Envoy Jul 2026
- dropped Prism Jul 2026
- detected New Relic May 2026
- detected Headless UI Apr 2026
- dropped Vite Dec 2025