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Dark Mode Email Checker
Test how emails render in dark mode with instant visual previews
verified Jul 15, 2026 · HTTP 200
CohortClass of 2026What it is
Test how emails render in dark mode with instant visual previews. Share optimized designs with your team and receive actionable recommendations to boost engagement across all viewing modes.
HTTP liveness
10 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
10 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2026weekly
550 products launched in 2026 · 100% still active
550 active0 sunset
Still active
100%
Median lifespan
4.9y