Instant Invoice Maker is an application focusing on super small businesses operating along the street in developing countries.

They can issue receipt faster than handwriting without repeatedly write the same item name 10 a day for each receipt. At the end of the day, the app will collect orders and calculate the total for the day.

Plus the orders was saved and can be exported to computer or CSV file. No internet connection requires for small businesses to operate. UI was designed for simplicity and similarity. They just dont need to think and learn since the first time using the app.