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LetterCircuit

Real handwritten mail, wired into your workflow.

A real pen, real ink, written by our machine from a font matched to your hand. You approve the proof; we write, inspect, and mail.

See how it works

Marisol Reyes418 Alder StreetDavis, CA 95616

Dear Marisol, It has been one year since you got the keys to Alder Street. I hope the house is everything you wanted. If you ever need anything, call me. Warmly, Dana

A sample proof: a greeting card and its envelope, written in the handwriting chosen with the arrows on the slip below it.
Sample proof
Piece 1 of 250
Format
A7 card and envelope
From your list
Name and street

Hand 01 of 15 Friendly modern handwriting

Nothing is written until you approve.

Written with a real pen,automated everywhere else.

What LetterCircuit does differently

Everything on this site comes back to these four.

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, HubSpot, 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.

  • Essential $399/mo
  • Professional $949/mo
  • Enterprise $2,199/mo
See full pricing

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.