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Bootstrap 4 Alpha
Bootstrap is the most popular HTML, CSS, and JS framework
verified Jul 10, 2026 · HTTP 200
CohortClass of 2015What it is
Bootstrap is the most popular HTML, CSS, and JS framework. [Web App, Tech]
HTTP liveness
8 probes since Jun 16Jun 16Jul 10
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — liveAlive · 200 OK
Discussion 0 comments
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Pulse Indexobserved activity
8 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2015weekly
12,940 products launched in 2015 · 100% still active
12,899 active41 sunset
Still active
100%
Median lifespan
4.9y