Nº 01On your phone
The iOS app
FrankKi helps you writeTell the app what it is about. FrankKi drafts the letter for you. You read it over, adjust and tap send. Address, form and postage are handled in the background.
On the App Store · Android soonReal letters · for AI agents and people
The easiest way to send a real letter.
Send a real physical letter from your phone, your browser, a ready-made template or your AI agent. FrankKi prints, encloses and mails it worldwide, from €1.49 per letter, no subscription. The MCP server for physical mail is live.
For AI agents and people/Worldwide: Deutsche Post and partners/No subscription, you pay per letter
WorldwideGermany, France and 200+ destinations
WRITE
PRINT
SEND
DELIVERED
Sent by your AI agent
Delivered by
Germany
Other destinations
Switzerland
France
Netherlands
United Kingdom
Austria
Belgium and Luxembourg
Spain
India
The agentic layer of letters: physical mail for AI agents and people. Delivered by Deutsche Post and postal partners worldwide, posted from the app, the browser or over MCP.
Claude·
ChatGPT·
Cursor·your own agent
Claude·ChatGPT·Cursor·your own agentNº 01Five ways
Five ways to send a letter.
Whether the text comes from the app, from the browser, from a ready-made template or from your AI agent. The ending is always the same: FrankKi prints, franks and hands it to the postal service, in Germany and worldwide.
Nº 02In the browser
The web app
You bring the textYour text is already written? Paste it in, pick the recipient, send. Works for businesses too, with your own letterhead and sender profile. Runs in the browser, nothing to install.
frankki.appNº 03From a template
The templates
No accountCancellations, appeals, withdrawals, payment reminders. Pick the template that fits, fill in your details and the recipient, pay for the letter and it goes out. No sign-up, no install.
frankki.app/vorlagenNº 04With your AI
The MCP server for physical mail
Your agent writes · liveAdd https://mcp.frankki.app once in Claude, ChatGPT, Cursor or your own agent. Then one sentence is enough: your agent writes the invoice to client X, FrankKi sends it as a real letter. You approve.
mcp.frankki.app · Model Context ProtocolNº 05In ChatGPT
The ChatGPT app
Coming soonDescribe the letter in the conversation, FrankKi drafts it, you pay on our own checkout page and the letter goes out. No install, no account. The date lands here once the app is approved.
In progressNº 02How it works
And then? Print. Frank. Post.
What happens after you hit send.
01
Your text arrives
From the app, from the browser or from your agent. To FrankKi it is the same letter.
02
FrankKi prints and encloses
On real paper, folded and enclosed to DIN 5008. Companies print on their own letterhead.
03
The postal service takes over
Deutsche Post within Germany, local postal tariffs across DACH and several European countries, DHL to the rest of the world. Registered mail is available where the destination supports it.
04
Delivered, worldwide
In Germany usually within three working days, in the rest of the world typically 4 to 18 business days. With tracking your agent can read too.
Nº 03Live · MCP server for physical mail
Your AI agent sends real letters. Live over MCP.
FrankKi MCP is the live MCP server for physical mail. Add https://mcp.frankki.app once in Claude, ChatGPT, Cursor, VS Code or your own agent, and it can draft, price, send and track a real letter without leaving the chat, worldwide. Physical mail for AI agents and people, one fulfillment path for both.
create_letterlist_templatesadd_recipientget_quotesend_lettertrack_letter
Human in the loop, with approval flows, Mandanten (client matters) separation and an Einlieferungsbeleg (proof of posting). Nothing goes out without your decision.
Nº 04What people and agents use FrankKi for
The paperwork that can't be handled by email.
Exactly where a real letter counts, with a date, proof and a signature. Typed by you or posted by your AI agent.
Cancellations
Gym, mobile, energy, insurance. Out on time, with proof.
Letters to authorities
Tax office, agency, application. Correct form and on time, without a trip to the post office.
Invoices & payment reminders
Your agent writes the reminder to client X, FrankKi sends it in seconds. With a date and proof.
Objections & deadlines
Fines, notices, appeals. FrankKi factors in the working-day buffer.
Tenancy matters
Defect notices, cancellations, objections to the service-charge statement.
Mail merges
Many recipients, one template. Your agent posts them all in one go.
Nº 05Pricing
Letters from €1.49.
With a business account on the web, a German standard letter starts at €1.49, including print, envelope and postage. Your monthly volume sets one price for every letter that month, including the first.
- German standard letter: €1.49 from 1,000 · €1.79 from 500 · €1.99 from 100 · €2.19 from 20 · €2.49 below 20 letters a month
- Registered mail from €5.59 for Einwurf or €5.99 for Übergabe
- You see the exact price before you or your agent approves the send
The card shows the single-letter app price without a business account. Create a partner account on the web to use the volume prices shown here. There is no subscription or minimum term. Business pricing
German standard letterSingle letter · no business account
Print, envelope and postageincluded
Totalfrom €1.49
Registered mail, total price per letter
Einwurf-Einschreiben€7.59Übergabe-Einschreiben€8.19
FAQ
Good to know.
How fast does my letter arrive?
Within Germany, Deutsche Post delivers around 95% of letters at E+3 and 99% at E+4, so three to four working days after posting. FrankKi factors weekends and holidays into the deadline buffer. Internationally, transit time depends on the destination country.
Can I send registered mail?
Yes. You choose between Einwurf-Einschreiben with an Einlieferungsbeleg (proof of posting) and Übergabe-Einschreiben against a signature, depending on how much proof you need. For most deadline-bound letters, Einwurf is enough.
How do I send mail from an AI agent?
Straight from the chat, today. FrankKi MCP is live: add https://mcp.frankki.app as a remote MCP server in Claude, ChatGPT, Cursor or VS Code, sign in securely, and your agent can draft, price, send and track real letters worldwide. The final approval always stays with you.
What does FrankKi cost?
A standard letter starts at €1.49, print and postage included. Registered mail and express come on top as a transparent surcharge. For businesses and high-volume senders there is volume pricing from €1.49 per letter. There is no subscription and no minimum term, you only pay for the letters you actually send.
Does it work internationally?
Yes. FrankKi sends worldwide. Across DACH (Germany, Austria, Switzerland) and several European countries your letter runs at local postal tariffs through the postal service in the destination country, Deutsche Post within Germany. The rest of the world goes by DHL, typically in 4 to 18 business days. You write as usual, we take care of the rest.
Guides
From the blog
Guides, templates and sample letters.
Send physical letters with Hermes Agent and FrankKi MCPConnect Hermes Agent to FrankKi MCP. Prepare a physical letter, check the preview and postage quote, and approve the letter before dispatch.Send physical letters with OpenClaw and FrankKi MCPSet up FrankKi as an OpenClaw MCP server. Check authentication and tool access, prepare a letter, and review the postage quote before approval.When to put a complaint or request in writingA practical way to decide when a dated letter helps, what evidence to keep, and which US or UK template fits the problem.Send a letter from an AI agent in a minute, with no accountFrankKi runs a public MCP lane with no sign-in: seven tools, three calls, one Stripe link. The full walkthrough with real production output, the prices, and the rules the lane enforces in code.