New check

Comparison

Compadre (ComPADRE) vs OpenStax

Compadre (ComPADRE) lands on Depends, and OpenStax lands on Worth it.

Compadre (ComPADRE)

Depends

Confidence: Low

Evidence is thin, but Compadre.org appears to be a free academic resource library for physics and astronomy educators, not a product you buy.

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OpenStax

Worth it

Confidence: Medium

Buy if OpenStax lists a title for your course . free, peer-reviewed textbooks from a Rice University nonprofit with major foundation backing.

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Compadre (ComPADRE) versus OpenStax
Compare	Compadre (ComPADRE)	OpenStax
Verdict	Depends	Worth it
Best for	Physics and astronomy teachers	Students avoiding $200+ textbooks
Who it's not for	Software buyers . nothing here to purchase	Upper-level or niche subjects . catalog skews intro
Privacy	One community-reported XSS via Open Bug Bounty; the site publishes its own security page.^⁴	No known public vulnerabilities found in the sources reviewed.¹²
Support quality	No support evidence found	Help center exists; no quality evidence
Public sentiment	No user reviews of itself surfaced; nearly all 'Compadre' reviews found concern unrelated products like a Strymon guitar pedal.^⁷	Reddit professors and learners are broadly positive on value and self-study usefulness, while some instructors flag inconsistent accuracy.¹⁶
Biggest gotcha	XSS reported on via Open Bug Bounty; remediation status unclear^⁴	OpenStax Assignable . LMS assignments and grading . is a paid institutional product¹³

Pick Compadre (ComPADRE) when

Physics and astronomy teachers
Physics education researchers
Students wanting curated lesson material

When Compadre (ComPADRE) is not a fit

Software buyers . nothing here to purchase
Non-science educators
Teams expecting vendor support or SLAs
Guitarists and knife shoppers . wrong Compadre

Pick OpenStax when

Students avoiding $200+ textbooks
Intro course instructors adopting OER
Self-learners in math and science
Cost-cutting departments

When OpenStax is not a fit

Upper-level or niche subjects . catalog skews intro
Courses needing rich interactive homework . that costs extra via Assignable
Teams wanting white-glove publisher service like McGraw Hill

Sources

ComPADRE Brings Digital Resources to Physics and Astronomyaps.org
news
ComPADRE Policies (AAPT)aapt.org
official
Compadre.org Product Security Pagecompadre.org
official
compadre.org Cross Site Scripting vulnerability (Open Bug Bounty)openbugbounty.org
security
Java Security and Browser Settings . Physlet Physics on Compadrecompadre.org
official
PER-Central item hosted on Compadreper-central.org
official
Strymon Compadre pedal review (unrelated product)guitarplayer.com
review
Reddit r/guitarpedals thread on Strymon Compadre (unrelated product)reddit.com
review
OpenStax homepageopenstax.org
official
Order Low-Cost Print Textbooksopenstax.org
official
About OpenStax . Rice University nonprofitopenstax.org
official
Product security pageopenstax.org
security
OpenStax Institutional Sales for Assignablehelp.openstax.org
official
Rice's OpenStax awarded $90M by NSFnews.rice.edu
news
OpenStax transforms access and affordability (founded 2012)avdf.org
news
Experiences with OpenStax textbooks . r/Professorsreddit.com
review