This calculator application is meant to be a 1:1 clone of the CASIO FX-991 EX/DEX, the most intuitive and at the same time most powerful calculator on the market. It is also very common and convenient.
If you want to have this calculator as an app, please let us know. Mail us and rate this app positively! If there is enough demand, we will develop it. First steps of development are already done.
This is a market research and development request application.

Please visit https://martinslab.de/privacy-policy-terms-and-conditions/ to see our privacy policy on collected data.

// Option A //

To download FX991 EX Original Calculator mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download FX991 EX Original Calculator mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download FX991 EX Original Calculator from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search FX991 EX Original Calculator in HappyMod App.