Books & Magazines
openintro.org reviews & complaints
openintro.org
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About openintro.org
OpenIntro's mission is to make educational products that are free, transparent, and lower barriers to education. We're a registered 501(c)(3) nonprofit.
Quick facts
Category: Books & Magazines
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Rating distribution
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Trust & Transparency
Trust Signals Score: 73
Confidence: Medium
Last checked: Mon, Mar 2, 2026 11:02 PM
Domain maturity
• Domain age 16.7 years
• Registrar data present
good
Source: rdap
Security posture
• HTTPS reachable
• Certificate expires in 199 days
good
Source: crawler
Service availability
• Uptime ratio 100% over last 7 days
good
Source: crawler
Ownership transparency
• Owner claim not verified
bad
Source: crawler
Content completeness
• Description available
• No docs/pricing hints detected
bad
Source: crawler
Limited data. What we know: recent crawl and content signals. What we don't know: complete external registry and threat data.
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