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last checked Jul 15, 2026 · Timeout
CohortClass of 2026What it is
co2.js is a JavaScript library that enables developers to estimate and monitor CO2 emissions generated by their web applications and software. By integrating emissions tracking directly into development workflows, it helps teams understand and reduce their digital carbon footprint. The library provides actionable insights for building more environmentally sustainable digital products.
HTTP liveness
10 probes since Jun 16Jun 16Jul 15
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jul 15, 2026Probe inconclusiveTimeout
- Jun 16, 2026First probe — liveAlive · 200 OK
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Pulse Indexobserved activity
472/4 signal families
Liveness40%1.00
Press30%no data
GitHub20%no data
Tranco10%0.72
Weighted observed activity · updated Jul 15
Cohort survival · Class of 2026weekly
567 products launched in 2026 · 100% still active
567 active0 sunset
Still active
100%
Median lifespan
4.9y