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SendLetter
A service that converts digital documents, invoices, and letters into physical mail
since Jun 16, 2026 · HTTP 200
CohortClass of 2026What it is
A service that converts digital documents, invoices, and letters into physical mail. SendLetter handles printing, folding, and delivery to addresses globally, eliminating the need for in-house mailing infrastructure.
HTTP liveness
9 probes since Jun 16Jun 16Jul 13
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
262/4 signal families
Liveness40%0.40
Press30%no data
GitHub20%no data
Tranco10%0.95
Weighted observed activity · updated Jul 15
Cohort survival · Class of 2026weekly
550 products launched in 2026 · 100% still active
550 active0 sunset
Still active
100%
Median lifespan
4.9y