FX991 EX Original Calculator is an Android application developed by MARTINs. It is a perfect 1:1 clone of the CASIO FX-991 EX/DEX, which is the most intuitive and powerful calculator available in the market. This calculator app is very common and convenient to use. The app is free to use and has no hidden charges.

The calculator app is designed to provide users with a similar experience as the real calculator. The app has all the features of the real calculator, including scientific and engineering notations, statistics, and financial calculations. It also has a matrix and vector calculations feature, which makes it a perfect tool for students and professionals. The app is easy to use and has a user-friendly interface. It is also lightweight and does not consume too much space on your device.

In conclusion, the FX991 EX Original Calculator is a perfect app for anyone who needs a powerful calculator on their Android device. It is a 1:1 clone of the CASIO FX-991 EX/DEX, which is the most intuitive and powerful calculator available in the market. The app is easy to use and has a user-friendly interface. It is also lightweight and does not consume too much space on your device.