This page lets you enter multiple stock tickers (eg. AAPL, MSFT, GOOGL) and portfolio expressions (eg. 1.75*NVDA+1.5*AMZN+4.25*KO) and compare their returns visually against a benchmark (like SPY). It’s built with Python and Flask on the backend. Data comes from Yahoo Finance via the yfinance library, pandas crunches the numbers, and matplotlib generates the plots. The…