EET Plus is a free mobile cash register system that allows you to easily register EET. You don't even need a printer. It includes all the necessary features to comply with the legal obligation of EET and some additional useful features. The emphasis is on ease of use. You won't even need a printer. With the option to print receipts on portable Bluetooth and WiFi printers, it works offline and allows you to issue invoices and tax documents. You can share receipts via email, SMS, WhatsApp, and more. EET Plus is the most widely used free EET application in the Czech Republic.