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Getting Real
The smarter way to build web apps
since Jun 16, 2026 · HTTP 200
CohortClass of 2015What it is
The smarter way to build web apps. A free book by 37signals. [Web App, Startup Books, Tech]
HTTP liveness
20 probes since Jun 16Jun 16Jul 16
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — redirectedRedirected offsite
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Pulse Indexobserved activity
252/4 signal families
Liveness40%0.40
Press30%no data
GitHub20%no data
Tranco10%0.88
Weighted observed activity · updated Jul 15
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