Send your list
Bring a CSV, or connect your own system through the REST API, Zapier, Salesforce, HubSpot, or MCP. See integrations.
How it works
From your list to a proof you approve to mail in hand.
- 1
Send your list
Upload a recipient CSV or connect it through the API, Zapier, Salesforce, HubSpot, 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 and postal handoff; you see status at every step.
Nothing is written until you approve.
What happens at each step
Approve the proof
Review the exact message and merge data before a single piece is written.
We write, QA, and mail
Real-pen writing in the matched handwriting font, then 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.