Budget is a JavaScript toy app that implements a KNN to predict where the expense is being made.
A online version is hosted here. You can add it to your phone as an app, if you like.
It uses the day of the week, the hour of the day and the value of the expense as features to predict the location of the purchase. It's a toy app cause it stores data in the localStorage of the browser. It's not reliable or robust and the code is a bit messy; it was made as an exercise (or proof of concept) after a machine learning class.
The app was written in portuguese, but a quick hack was made to accept other languages. Right now you can choose between english and Brazilian portuguese.
Make a copy of the en.json file and replace the sentences, translating to the desired language. After tat, change the variable langSetting in js/main.js passing the name of the json file you made:
let langSettgin = 'js/en.json';