The app calculates in real-time as soon as you change the stock, the initial investment, or the date that you made the buying transaction. It also shows a small graphic at the bottom card with the performance the stock has had over the years, allowing you to change the date you'd like to enter as your initial investment date. DISCLAIMER: The creators of the app and the app itself don't represent any of the business entity names that are shown or mentioned in any part of the app, all the data is sourced by using the Twelve Data API, its license and other information can be found in their website https://twelvedata.com/ This application does not give legal nor investment advice, it's merely informative. The stock prices are not guaranteed to be 100% accurate with actual values.