What website/tools calculate the return of S&P 500 according to money in (deposit) and out (withdrawal) by a number of years?

Hi,

I'm helping my friend assessing the performance of his portfolio that has been managed by a wealth management firm for many years. He knows close to nothing when it comes to stock/investing. So he doesn't know whether the wealth management firm (recommended by his sibling) is performing. I think the best way is to measure it against S&P 500. However he always moving money in (deposit) and out (withdraw) from this account every year. Is there a tool or website that allows me to enter the deposit and withdrawal for each year and gives me the return as if those money were to be invested in S&P 500? Please advise.