Lucky 4D Generator is a free Android application developed by Fong Jaye. As the name suggests, it is a number generator that generates up to 4 digits from 0 to 9. While it is designed for Singapore's Lottery 4D, it can be used for other purposes as well.

The app is very simple to use, with a clean and straightforward interface. Users can simply tap on the "Generate" button to generate a random set of numbers. The app also allows users to save their generated numbers for future reference. Lucky 4D Generator is a great tool for those who want a quick and easy way to generate numbers for the lottery or other purposes.