The relative strength chart on FYERS Web allows you the compare the performance of one security (numerator) with that of another (denominator).
Go to the indicators panel and search for "Ratio". Select it and then in the Add Symbol box, choose the desired security (denominator) with whom you want the performance to be compared. Finally, click Apply.
In the sample chart above, the top panel shows Reliance Industries. The bottom panel shows the performance of Reliance (numerator) with that of Nifty (denominator).
Hope this helps!