EET Plus is a free mobile cash register system. Record EET on a simple calculator. And you won't even need a printer. It contains all the functions necessary to fulfill the legal obligation of the EET and a few useful additional functions. Emphasis is placed on ease of use. You won't even need a printer.

Video how to start EET in ten minutes:
https://youtu.be/Q36LCWXXFBc

Why use EET Plus:
The most used free EET applications in the Czech Republic.
EET without a flat rate, EET without a limit on the number of receipts, EET without a limit on the number of devices.
EET receipts without printer, only with mobile.
Possibility of printing receipts on portable Bluetooth and WIFI printers.
Works offline - post receipts off the internet.
Simple operation, you enter the amount on the calculator.
The possibility of frequent sales items with a selection or via a shortcut.
Possibility to generate invoices and tax documents.
Possibility of sharing receipts via email, sms, whatsapp, ...
Works on both your mobile phone and tablet (Android).
VAT support.
Never mind a short-term Internet outage, the application itself solves this.
Export reports to Excel.
Export all receipts to Excel.
Simplified mode support.
Support for VAT ID.
Possibility of multiple outlets on one mobile.
Possibility to define receipt header.
Optional PIN protection.
Possibility of used goods regime - sale in special regime §90.
Integration to SumUp payment terminal.

Lots of useful information on EET can be found at https://eetplus.cz/caste-questions-and-responsions/