The operating system for your business.
Appointments, invoices, forms and online payments — in one account instead of ten tabs. The twist: you set up and adjust every building block by talking to your AI assistant — which configures your business but never sees your customer data. Hosted in Germany, no tracking. Applein is taking shape block by block — and a first setup is already live in a private medical online practice.
What the operating system is made of.
Four building blocks, designed for each other from the start — not wired together afterwards. They mesh as soon as they’re there.
Appointments & calendar
Your customers book their own appointment, you see calendar and capacity at a glance — no back-and-forth by email.
Invoices
Write, send and archive invoices in a GoBD-compliant way — all in one place, without typing them into a second program.
Forms
Collect enquiries, consents and uploads the GDPR-compliant way — right with you, without reaching for an extra tool.
Online payments
Your customers pay by card or SEPA — right in the appointment, in the form or at the checkout. The money’s in before you even think about the invoice.
Handled via StripeAsk instead of click.
Just say how your business should run — add a product to the checkout, design an invoice and a form, set your logo and colours, set up the booking calendar. The AI builds and adjusts the structure but never sees your customer data — configuration yes, data no. An open standard (MCP) makes it possible, letting every building block dock on. That’s what turns four tools into an operating system.
One account. One place for everything.
What happens in one place is already there everywhere else. An appointment gets booked, the payment runs, the receipt is ready — without you carrying the same info from one service to the next. That’s what makes a connected operating system.
Appointment or enquiry
Card or SEPA
Invoice & email
All in one place
Built for day-to-day business.
If you look after customers, hand out appointments and write invoices, you know the tab chaos. Applein is built for exactly these people — who want to run their day-to-day business in one place, not spread across five logins.
Hosted in Germany. No tracking.
Hosting in Germany
Your data sits on servers in Germany — not in third countries.
No tracking
No cookie banner, no third-party analytics, no sharing. Full stop.
Part of the build
Privacy here isn’t a checkbox at the end, it’s built in from the first line.
From prototype to platform.
diegynpraxis.de already runs on Applein building blocks: appointment requests, client records, forms and intake preparation mesh there in real practice life — no concept, but in use every day. The connected operating system grows out of this setup.
Tell us what you need.
Describe your business in a few words and what eats most of your time each day. Applein gets back to you within one or two business days — person to person, no automated reply.
Message sent.
Thank you — I will get back to you within one to two working days.