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FourZeroFour
Showcase of the best error pages on the web
last checked Jul 10, 2026 · Unknown
CohortClass of 2016What it is
Showcase of the best error pages on the web. [Web App, Design Tools, Tech]
HTTP liveness
9 probes since Jun 16Jun 16Jul 10
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — unverifiedUnknown
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
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