One of the simplest ways is to sort your stock list by %change. With the appropriate indices or sectors in the list you can easily see who is doing better than whom. Most of the charting programs let you sort your watchlists by a certain column. Or to get some idea on the change in RS going on you could use Tradestation, eSignal, AmiBroker, Wealt-Lab, etc., etc. and program you're own indicator. Just take the change in the target stock and divide it by the baseline stock over your time-frame of interest. I've found RS to be one of the best 'hints' out there, usually on a longer time-frames though. Good luck.