The android application is online. You can download it on the google play store : https://play.google.com/store/apps/details?id=com.gleyco.ultratower

This application allows you to change all the parameters of the tower without having to modify the arduino code. It also allows you to configure a data transfer to ThingSpeak. And most importantly, you can calibrate your sensors easily.

I am not a professional developer, I only know how to develop applications in Kotlin for Android and unfortunately I could not make the application for IOS.

For non android users I would make an arduino code where you can easily modify the variables.