Create an App for IOS and Android

I need an app that runs in android and iOS. The App will have only 2 screens. - The first screen is going to be a login screen. The person will put his/her name and email. Then a button for the next screen. - The secon screen will be all white. It will have a ruler with the milimiter scale. The person who is using the app needs to be able to move the ruler. - We will need to have a database for the name of the people and the emails that the people use to login. They put the info only in the first time they log in, then it will be saved on their phone. - Here is the link for the screens [login to view URL] If you have any doubts just contact me.