Real Handwritten Letters
Real handwritten mail, wired into your workflow.
Automate the mail. Scale the connection.
Real, personalized handwritten mail, scaled like software, not like a factory.
“Handwritten at heart, automated everywhere else.”
What LetterCircuit does differently
Four things every other piece of copy on this site traces back to.
Your handwriting, matched for you
Custom handwriting fonts usually cost $1,500-2,000 and take about two weeks, with a designer in the loop. We turn your handwriting into your campaign's font as part of onboarding: minutes, not weeks, included, not upsold.
Believable imperfection, done honestly
A pen plotter writes every piece with a real pen, from a handwriting font with natural variance, so the proof you approve is exactly what gets written.
Plugs into your stack
REST API, Zapier, Salesforce, and MCP for AI agents. LetterCircuit is a physical-mail API for the AI era: send letters the same way you send any other automated action.
Review what goes out before it does.
Every batch is reviewed and approved before it mails. Useful for any team, essential for a compliance-sensitive vertical like real estate.
How it works
- 1
Send your list
Upload a recipient CSV or connect it through the API, Zapier, Salesforce, or MCP.
- 2
Approve the proof
Review the exact message and merge data before a single piece is written.
- 3
We write, QA, and mail
Real-pen writing, 100% inspection, and postal handoff; you see status at every step.
Ready to send something real?
Get early access to LetterCircuit and see the whole workflow, from your list to a proof you approve to mail in hand.