Anzan Soroban: Mental math training app with/without soroban, flash numbers

Hi People :) I made an app called Anzan. It is a tool to help you do math in your head. I built this because I wanted to get faster at adding numbers. I needed a simple way to practice every day. The app shows numbers on the screen very quickly. This is called Flash Anzan. You look at the numbers and add them up as they appear. At the end, you give the total. Here is what you can do with it: * Pick how many numbers you want to see. * Choose how fast the numbers flash. * Practice addition, subtraction, multiplication, or division. * Use numbers with up to 16 digits. The app is very clean. It does not have ads. It does not track your data. It is just a straightforward tool for your brain. I use it to keep my mind sharp. I hope it helps you too. Please try it and tell me what you think. I am happy to answer any questions.