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OpenStax
Free educational materials for K-12 and College [Science Books, Education, Tech]
verified Jul 15, 2026 · HTTP 200
CohortClass of 2016What it is
Free educational materials for K-12 and College [Science Books, Education, Tech]
HTTP liveness
22 probes since Jun 16Jun 16Jul 15
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
492/4 signal families
Liveness40%1.00
Press30%no data
GitHub20%no data
Tranco10%0.89
Weighted observed activity · updated Jul 15
Founders
Richard G. Baraniuk
Cohort survival · Class of 2016weekly
13,657 products launched in 2016 · 100% still active
13,633 active24 sunset
Still active
100%
Median lifespan
4.9y