I found a website, stockcharts.com, that let's you plot the ratio of two stocks. In the 'symbol' field, you specify the two stocks separated by a ':'. For example, "goog:$SPX" to plot the ratio of Google and the S&P 500. As a side note, there is a link partway down, 'linkable version' that let's you bookmark the chart. A recent one I was interested in:
GOOG versus S&P 500 over the past year
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