OpenStax
Verified live by HTTP probe across 37 observations. Pulse has been flat over the last 30 days.
HTTP liveness
realSignal telemetry
4 families · 2 observed · observed onlyopenstax.orgedge
direct originserver
AmazonS3Tranco rank
#24,311
Analyst read
generated from the observed metrics above · no external narrativeOpenStax's listed site resolved live when we last probed it on Aug 27, 2026, so we mark it verified alive. Its Pulse Index is 48.9 of 100, built from 2 of 4 observed signal families. Observed footprint: 7 functional tags. It sits on the competitive-alternatives graph with 1 linked rival, so the comparable set below leans on curated edges.
Comparable set
curated alternatives → functional tag-similarity| Company | Basis | Overlap | Pulse | 30d Δ | Status |
|---|---|---|---|---|---|
| Khan Academyeducation | curated | — | 49.7 | 0.0 | ● live |
| Open Access Buttoneducation | similar | 100% | 44.3 | 0.0 | ● live |
| 100+ Free Machine Learning eBookseducation | similar | 88% | 43.9 | 0.0 | ● live |
| YCombinator/Sam Altman Stanford Startup Class in PDF/Epub/Mobi Ebook Formateducation | similar | 88% | 8.0 | 0.0 | — unverified |
| Books4Languageseducation | similar | 86% | 8.9 | 0.0 | — unverified |
| Climatescapeeducation | similar | 86% | 40.0 | 0.0 | ● live |
| Indian SaaS Outlook Report 2020-21education | similar | 86% | 8.6 | 0.0 | ■ inactive |
| Dissemineducation | similar | 86% | 10.1 | 0.0 | — unverified |
Confidence reflects source and category coherence: curated = an editorially linked alternative; similar = strong functional tag-overlap in the same category; tag-overlap = shared tags only and may be noisy. Overlap is the shared functional-tag ratio (Jaccard) for tag-matched rows. Pulse is the observed-activity index real and 30d Δ its signed month change; a dash means insufficient observed history, never zero.
Structure
observed attributesFunding & team
not in sourceNo disclosed funding in our sources. Funding data covers only ~1% of the corpus (462 rounds across 79K products), so absence here is unknown, not zero— we don't estimate a number we can't source.