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SendLetter

Integrations

Send invoices, payment reminders and business letters by post. Find your accounting software, import an invoice where supported or upload a PDF, then review and approve your letter.

SendLetter × ChatGPT & Claude

Turn a good idea into a letter on paper.

Let your AI assistant help with the words, ask for a price and review the letter before you decide. Your account, return address and approval stay in your control.

ChatGPT

Officially listed in the ChatGPT catalogue

SendLetter is approved by OpenAI and publicly listed in ChatGPT. Click install, sign in with your SendLetter account and start writing.

Open in ChatGPTChatGPT guide

Claude

Claude directory listing coming

Add SendLetter to Claude today as a connector using the MCP address below. Once the Claude directory listing is live, it will be there too.

Add to ClaudeClaude guide

Nothing is posted until you approve the exact letter, recipient, return address and final price. A ChatGPT or Claude subscription does not cover printing or postage; that comes from your SendLetter balance. Write on the website

Accounting integrations

47 / 47

Assistants

Every one of these quotes the price and waits for you before anything is printed. An assistant cannot post a letter in a single step, on purpose.

Automation platforms

Send from a workflow, and start a workflow when a letter is printed, posted or delivered.

Everyday tools

For the letters that start in a mail client, a shop or a shoebox of paper.

Build your own

The same API everything on this page is built on.

Not here?

Everything on this page is built on one public API with an OpenAPI description, so a connector for something else is usually an afternoon rather than a project. Tell us what you use.

Read the API documentation

Pricing