o3 Mobile POS is a free Android-based billing and invoicing app developed by OOO SOFTWARE HOUSE. The app is designed to cater to the needs of businesses and individuals requiring a comprehensive billing solution. It comes equipped with a range of features that make it an ideal choice for businesses of all sizes.

The app offers unlimited invoice and cash bill creation with an unlimited number of items and customers. The multiple selling price feature enables businesses to set different prices for different customers. Additionally, the app is compatible with 58mm or 80mm thermal printers that can be linked via Bluetooth. The sales report feature provides a detailed analysis of sales, and users can export sales reports to Excel for further analysis. Furthermore, the app is GST and SST format ready, making it an ideal choice for businesses operating in Malaysia.