Lesson scheduling and invoicing without busywork.

Flowbily brings your Apple or Google Calendar and invoicing together in one easy-to-use app. Import data from your calendar and create invoices from the calendar or on their own. Keep everything clear and accessible at a glance.

✓ Trusted by tutors, coaches, and schools
✓ Local-only, no cloud
✓ Support in English
Invoice export
to Documents / Flowbily folders
Automatic name matching
Safe on your device, data stays local
  • Schools & clubs
  • Music tutors
  • Sports clubs
  • Science / lab courses
  • Art studios
Flowbily saves time across fields — from schools to sports and languages.

Features that save time!

Flowbily is built for real-world practice. Fast calendar imports, smart calculations, and one-click invoice exports.

New
📅

From calendar to a clear overview

Connect your Mac Calendar or Google Calendar and Flowbily loads the lessons for you. It matches them to clients, you pick a month, and you see what to invoice. No retyping.

🧾

An invoice in one click

Turn lessons into an invoice for a client and a month. Add travel or another item and the PDF lands in a folder you can actually find. A minute in Flowbily instead of an evening in spreadsheets.

👥

A client list that saves your nerves

Rates, emails and billing details in one place. Save them and Flowbily uses them, and after every change it recalculates correctly. Less searching, fewer mistakes on the invoice.

⚙️

An invoice that looks the way you need

Your name, account, due date, VAT, colour, logo and signature. Shape your invoice the way you need.

🔐

Your data stays with you

No outsider cloud. The app runs on your computer, and the PDFs are in your own Documents folder.

🚀

A month that adds itself up

Excused lessons are skipped, cancelled ones are billed, make-up lessons are deducted. From one overview you go to invoices, not to adding it up by hand.

How it works in practice?

1) Connect your Mac Calendar or Google Calendar. 2) Flowbily loads the lessons, matches them to clients in the address book, and shows you which events are unmatched for the selected period. 3) Pick a client or the whole month and one click gives you the invoice. It is saved into Documents so you stay organized.

  • Automatic client matching by name.
  • Fast export for a single day or a whole month.
  • Optional extra items (e.g. travel) before export.
  • Open the target folder with one click after export.
12 000 Kč
A preview of calendar data matching and processing.
MonthlyYearly

Free

0 Kč / month
0 Kč / year
  • For Windows or macOS
  • Up to 5 clients and 5 invoices per month
  • Up to 25 calendars
  • Calendar and PDF invoices
  • 1 invoice line and 1 price list
  • No email, bank, or CSV/XML
  • No address book edits

Light

199 Kč / month
2 189 Kč / year
  • For Windows or macOS
  • Up to 50 clients and 30 invoices per month
  • Unlimited calendars
  • Up to 5 invoice lines
  • Send invoices by email
  • Bank payment import
  • CSV and XML export
  • Discount, logo and due date
  • Up to 5 price lists and 10 price list items
  • Address book edits
  • Payments and matching

What clients say

Download Flowbily

Download Flowbily for free, without entering a payment card. You start on the Free plan, and when you want more, you can move up. Sign in and verify your email to download.

✓ Windows 10/11 or macOS 12+
✓ 240 MB of free space

Frequently asked questions

Is Flowbily an online service?
No. Flowbily runs as a desktop app directly on your device, keeping you in full control of your data. An online connection is only used for sign-in and license verification.
How does calendar import work?
Connect your Mac Calendar or Google Calendar and Flowbily loads the lessons for you. It matches them to clients and you get an overview ready to invoice.
How does invoicing work?
From the lesson overview, select a client and month to generate an invoice. Flowbily calculates hourly rates, creates a PDF, and saves everything organized by date and client name. If you want to issue an invoice independently of the calendar, you can create a full invoice directly on the Invoice tab at any time.
Do you support VAT and different rates?
Yes. In settings, you specify whether you are a VAT payer and set your default rate. Any extra items (e.g. travel) can be added directly when creating the invoice.
Can I bring existing client data?
Yes. You can easily export the address book from the app and then import it into a new setup or another computer at any time.