Customers
Loved by teams who care about the inbox.
From solo founders to fast-growing brands — see how teams replaced agencies and generic templates with Letters.
Northwind
Lumen
Castel
Foundry
Orbital
Atlas
Verde
Harbor
Nova
Peak
3 hrs
SAVED PER EMAIL
$3k/mo
AGENCY COST CUT
2.4×
FASTER LAUNCHES
“We replaced a $3,000/month agency with Letters and our emails have never looked better. The whole team can ship now.”
Maya Chen
Founder, Atlas Coffee
“Our welcome flow went live in an afternoon and looks like a brand three times our size. It just gets our voice.”
Devin Park
Founder, Harbor Goods
“Transactional and marketing finally live in one place. Our developers and marketers actually use the same tool now.”
Sara Lin
Head of Growth, Nova
“The deliverability tooling alone paid for itself. Our password resets stopped landing in spam overnight.”
Tom Reyes
CTO, Verde Co