01 / On your phoneFrankKi helps you write
The iOS app
Tell the app what it is about. FrankKi drafts the letter for you. You read it over, adjust and tap send.
On the App Store · Android soonSay what the letter should say, via app, browser or AI agent. We handle the printing, enveloping and mailing. From €3.49 per letter, no subscription.
No matter where your text comes from. The ending is always the same: FrankKi prints, franks and hands it to the postal service.
Tell the app what it is about. FrankKi drafts the letter for you. You read it over, adjust and tap send.
On the App Store · Android soonYour text is already written? Paste it in, pick the recipient, send. Works for businesses too.
frankki.appConnect FrankKi once to Claude, ChatGPT or your own agent. Then one sentence is enough: your agent writes the invoice or payment reminder to client X, FrankKi sends it as a real letter. You approve.
Model Context ProtocolWhat happens after you hit send.
From the app, from the browser or from your agent. To FrankKi it is the same letter.
On real paper, folded and enclosed to DIN 5008. Companies print on their own letterhead.
Deutsche Post within Germany, the destination country's postal service internationally. As registered mail if you want.
In Germany usually within three working days. With tracking your agent can read too.
FrankKi speaks MCP, the open standard from Anthropic. Connect FrankKi once to Claude, ChatGPT, Cursor or your own agent. From then on your AI writes, addresses and sends letters for you. You approve before anything goes out.
Exactly where a real letter counts, with a date, proof and a signature.
Gym, mobile, energy, insurance. Out on time, with proof.
Tax office, agency, application. Correct form and on time, without a trip to the post office.
Your agent writes the reminder to client X, FrankKi sends it in seconds. With a date and proof.
Fines, notices, appeals. FrankKi factors in the working-day buffer.
Defect notices, cancellations, objections to the service-charge statement.
Many recipients, one template. Your agent posts them all in one go.
You pay per letter, not per month. No base fee, no minimum term, no lock-in. The price is set before you or your agent approves.
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.
Yes. You choose between Einwurf-Einschreiben, Übergabe-Einschreiben and Einschreiben mit Rückschein (the German registered-mail options), depending on how much proof you need. For most deadline-bound letters, Einwurf is enough.
FrankKi provides an MCP endpoint. You connect it once to Claude, ChatGPT, Cursor or your own agent and sign in securely. From then on your AI can create, price and post letters. The final approval always stays with you.
A standard letter starts at €3.49, print and postage included. Registered mail and express come on top as a transparent surcharge. There is no subscription and no minimum term, you only pay for the letters you actually send.
Yes. FrankKi sends worldwide. Your letter is printed at the centre nearest the recipient and handed to the local postal service, Deutsche Post within Germany, Swiss Post in Switzerland for example. You write as usual, we take care of the rest.