Welcome to EngToolBox , where I have designed this all-in-one app with privacy in mind where all the data is on device and plus the journal that is on Moodtracker in Stress Relief section is safe and secure with Keychain security (you have to set the pin for yourself in the Settings on the app) plus the app is fully operational offline . 

The features of the app are:

-Multi purpose calculators , from simple calculator with the basic addition , subtraction ,multiplication and division that are operations you can do in other sections also like binary calculator with some more features included , octal calculator , Hexadecimal calculator and also base conversion calculator and also logarithmic calculator to more advanced calculators like symbolic and numerical calculator.
-Stress Relief section where you can find tips breathing exercises and also a full on device journal called Mood tracker.
-A game for engagement where you have to try finding the most optimal way to connect the battery to Led named Circuit Builder.
-A section about Formulas where you can find helpful formulas and explanation about different courses in computer engineering.
And also a section about timers where you have different presets for productivity timers like Pomodoro timer , and the settings section that you can enter you PIN.

Version 1.0:
Perfomance improvments and also a cleaner and a more user-friendly interface.

EngToolBox is an app designed with privacy on mind where is fully operational offline and no data is being collected.Download the app and I hope you will find the features useful.

If there is any request for new feature or bug you encounter don't hesitate to contact me .