About Coldletter
We think email deserves craft.
Coldletter began with a folder of MJML hacks and a conviction that product email should be designed, versioned, and automated like real software — then handed to the provider you already trust. We build the design and automation layer so design owns the look, engineering owns one API call, and nothing breaks on send.
What we believe
Principles we build on.
Tonal depth, no lines
Boundaries come from warm tonal shifts — paper, sand, white — never borders. The interface reads like layered paper stock.
The power gap
A dramatic jump from oversized display type to calm body copy. Hierarchy comes from scale, not decoration.
One laser
A single coral accent, used once per view on the one thing that matters most. Restraint is what makes it read as premium.
By the numbers
Built for teams who ship.
Start today
Precision and craft for every email you send.
Connect your provider, import a template, and ship your first automated send before lunch.