For myself, only as an option and there are many other features I'd like to see implemented first.
There is currently the option to view ROI and IRR for a few time periods, in the Portfolio tab with Performance (by Account, Security, etc).
What would make this more powerful is a visual comparison to an index.
Create an option to add a line for a comparison portfolio containing the S&P500, NASDAQ, or even an ETF (as a stock index may be too aggressive as a baseline).
Details: Start the value of the comparison portfolio as equal to the portfolio on day 1 of the time frame of the graph (1 year, 3 year, etc) and calculate a certain number of units virtually held based on the closing price of the S&P 500 (example, if you have $10,000 and S&P 500 is at 5,000, then you have 2 units of S&P 500). Then, change the daily value of the comparison portfolio by daily closing price of the S&P500 (if the S&P 500 goes to 5,100, then this virtual portfolio of 2 shares is no worth $10,200). When money is added or removed from the account during the timeframe being displayed, buy or sell 'units' of the S&P500. This is basically doing a Money Weighted Return Comparison to your account (what you see on ETF or Mutual Fund reports comparing their performance to some index).
This would be very useful as it gives you an easy visual presentation of how your portfolio did versus just buying an ETF (whether SPY, QQQ, AGG, or perhaps a balanced ETF).
Hello @Yield Chaser,
Your idea has been merged into this already active Idea thread regarding the same request.
Thank you!