A Web Application built by streamlit package which rebalances daily the weights of stocks, commodities, FX, ETFs etc. Then calculates return and maximum drawdown and plots them while comparing to a base portfolio. Also has the options for weekly and monthly investments, reinvest a certain amount when the portfolio loses some percentage etc. You can see screenshots of frontend of the web application below.

Stock list: the name of the stocks, etfs etc. you want to include in your portfolio.
Comparison list: the name of the stocks, etfs etc. you want to compare your portfolio.
Start date: start date of backtesting
Stop date: stop date of backtesting
Initial amount: initial amount of portfolio
Reinvestment option: It can be ‘percentage’ or ‘constant’. If it is set as ‘percentage’ whenever total portfolio falls below reinvestment threshold, it will reinvest lost amount. If it is set as ‘constant’, it will reinvest a constant amount which is set by ‘reinvestment amount’.
Reinvestment threshold: percentage threshold for reinvestment amount. Whenever total portfolio value loses that much percentage, the script will reinvest by the method selected in ‘reinvestment option’.
Reinvestment amount: if you set ‘reinvestment option’ as ‘constant’, whenever portfolio falls below threshold percentage, the script will reinvest that constant amount. If ‘reinvestment option’’ is set as ‘percentage’, this amount will have no effect.
Below initial percentage: Whenever, you are reinvesting with constant amount, it will increase that constant amount by ‘below initial percentage’ percent for each loss below initial amount.
Weekly amount: weekly periodic constant investment amount
Monthly amount: monthly periodic constant investment amount

Date: date
Price_X: price of the X stock
X_size: USD amount of X stock in the portfolio
Total_value: total value of the portfolio
Periodic_reinvestment: weekly or monthly periodic investments
Reinvestment_due_to_loss: Amount of reinvestment whenever loss exceeds the threshold
X_change: Amount of change made in the X stock by the script. If it is positive, then the script has bought the stock, if it is negative, then the script has sold the stock.
Total_value_percentage: total value of the portfolio in percentages compared to initial amount
Drawdown: Maximum drawdown of the portfolio