What platform and software to use to create a app/website that only needs to perfom some math calculation and have 1 or 2 data forms widgets

I want to build an app/website that has only 2 or 3 widgets that would allow users to enter some data and names and have features such as autocomplete and then have some Java code or Python run some math on the data. I would also like to be able to store and retrieve the data easily. This would only be used by myself and I wanted to know what the best way to do this would be. I have looked into heroku app and wordpress but I don't know if they are the best options. Any help or suggestions would be appreciated.